Journal articles: 'Nanowire'

1

Kolmakov, Andrei, Xihong Chen, and Martin Moskovits. "Functionalizing Nanowires with Catalytic Nanoparticles for Gas Sensing Application." Journal of Nanoscience and Nanotechnology 8, no. 1 (January 1, 2008): 111–21. http://dx.doi.org/10.1166/jnn.2008.n10.

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Metal oxide semiconducting nanowires are among the most promising materials systems for use as conductometric gas sensors. These systems function by converting surface chemical processes, often catalytic processes, into observable conductance variations in the nanowire. The surface properties, and hence the sensing properties of these devices can be altered dramatically improving the sensitivity and selectivity, by the deposition of catalytic metal nanoparticles on the nanowire's surface. This leads not only to promising sensor strategies but to a route for understanding some of the fundamental science occurring on these nanoparticles and at the metal/nanowire junction. In particular studying these systems can lead to a better understanding of the influence of the catalyst particle on the electronic structure of the nanowire and its electron transport. This report surveys results obtained so far in this area. In particular, the comparative sensing performance of single quasi-1D chemiresistors (i.e., nanowires or nanobelts) before and after surface decoration with noble metal catalyst particles show significant improvement in sensitivity toward oxidizing and reducing gases. Moreover, one finds that the sensing mechanism can depend dramatically on the degree of metal coverage of the nanowire.

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Wu, Phillip M., Lars Samuelson, and Heiner Linke. "Toward 3D Integration of 1D Conductors: Junctions of InAs Nanowires." Journal of Nanomaterials 2011 (2011): 1–5. http://dx.doi.org/10.1155/2011/268149.

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A vision and one of the next challenges in nanoelectronics is the 3D integration of nanowire building blocks. Here we show that capillary forces associated with a liquid-air meniscus between two nanowires provides a simple, controllable technique to bend vertical nanowires into designed, interconnected assemblies. We characterize the electric nature of the junctions between crossed nanowires in a lateral geometry, which is one type of basic unit that can be found in interconnected-bent vertical nanowires. The crossed nanowire junction is capacitive in nature, and we demonstrate that one nanowire can be used to field effect gate the other nanowire, allowing for the possibility to develop extremely narrow conducting channels in nanowire planar or 3D electronic devices.

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Dunaevskiy M. S. and Alekseev P. A. "Elastic deformations distribution in laterally bent conical nanowires." Semiconductors 56, no. 7 (2022): 461. http://dx.doi.org/10.21883/sc.2022.07.54759.06.

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The elastic deformations in the conical nanowires are considered. An analytical expression was obtained for the distribution of elastic deformations along the length of the conical nanowire. It was found that at certain cone angles in nanowire there is an extended area of sufficiently high deformations comparable or even large than the deformation at the base of the nanowire. So, for example, when bending the conical (conical coefficient a=-0.7) nanowire with length L=1 μm and radius R=50 nm by Delta z=200 nm, the maximum deformation values are εxx,max=8%, while more than 95% of the nanowire is deformed by >3%. Keywords: nanowires, elastic deformations, conical nanowires, Young's modulus.

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Jeon, Seong Gi, Jae Yong Song, Ho Sun Shin, and Jin Yu. "Solid-State Formation of Intermetallic Compounds in Co-Sb Couple Nanowires." International Symposium on Microelectronics 2010, no. 1 (January 1, 2010): 000093–97. http://dx.doi.org/10.4071/isom-2010-ta3-paper5.

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Nanointerconnection technologies have attracted much attention for the future electrical interconnection in electronic packaging. Nanowire interconnection needs to form the intermetallic compounds (IMCs) between the nanowires, in order to effectively reduce the contact resistances. In this study, the couple nanowires of Co and Sb elements were selected to investigate the IMC formation in one dimensional confinement. The Co and Sb nanowires were electrochemically deposited into the anodic aluminum oxide templates, in sequence, which had the pore diameters of about 30 and 60 nm, respectively. Results show that the CoSb phase is formed between Co nanowire and Sb nanowire after heat-treatment at 773 K. The IMC formation was ascribed to the dominant diffusion of Sb atoms toward the Co nanowire. The fast diffusion of Sb atoms toward the Co nanowire resulted in the formation of Kirkendall voids between the IMC and Sb nanowires.

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Koblischka, Michael Rudolf, Anjela Koblischka-Veneva, XianLin Zeng, Essia Hannachi, and Yassine Slimani. "Microstructure and Fluctuation-Induced Conductivity Analysis of Bi2Sr2CaCu2O8+δ (Bi-2212) Nanowire Fabrics." Crystals 10, no. 11 (October 30, 2020): 986. http://dx.doi.org/10.3390/cryst10110986.

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Resistance measurements were performed on Bi2Sr2CaCu2O8+δ (Bi-2212) fabric-like nanowire networks or nanofiber mats in the temperature interval 3 K ≤T≤ 300 K. The nanowire fabrics were prepared by means of electrospinning, and consist of long (up to 100 μm) individual nanowires with a mean diameter of 250 nm. The microstructure of the nanowire network fiber mats and of the individual nanowires was thoroughly characterized by electron microscopy showing that the nanowires can be as thin as a single Bi-2212 grain. The polycrystalline nanowires are found to have a texture in the direction of the original polymer nanowire. The overall structure of the nanofiber mats is characterized by numerous interconnects among the nanowires, which enable current flow across the whole sample. The fluctuation-induced conductivity (excess conductivity) above the superconducting transition temperature, Tc, was analyzed using the Aslamzov-Larkin model. Four distinct fluctuation regimes (short-wave, two-dimensional, three-dimensional and critical fluctuation regimes) could be identified in the Bi-2212 nanowire fabric samples. These regimes in such nanowire network samples are discussed in detail for the first time. Based on this analysis, we determine several superconducting parameters from the resistance data.

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Sun, Yan Long, Li Min Dong, Tao Jiang, Cao Guo, and Xiao Qi Zhang. "Effection of Additive on Aluminum Nitride Nano-Wire Synthesis by Double Decomposition Method." Advanced Materials Research 744 (August 2013): 428–31. http://dx.doi.org/10.4028/www.scientific.net/amr.744.428.

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An method for making AlN(aluminum nitride) nanowires by double decomposition, and the effection of additives was described. Future more, the growth mechanism of AlN nanowire synthesis with addictive were analyzed. AlN nanowire were synthesis by he AlCl3 and NaN3 in stainless steel cauldron without solvent and using Mg and Zn as additive. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study characters of the AlN nanowire. It is shown that the process can produce AlN nanowire with mean diameters ranging from 50 to 100 nm at 450°C. The additive has effective facilitated on the synthesis of aluminum nitride nanowires, can improve the properties of aluminum nitride nanowire, minish the average diameter of aluminum nitride nanowires.

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Pereira, Alejandro, Guidobeth Sáez, Eduardo Saavedra, and Juan Escrig. "Tunable Magnetic Properties of Interconnected Permalloy Nanowire Networks." Nanomaterials 13, no. 13 (June 29, 2023): 1971. http://dx.doi.org/10.3390/nano13131971.

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In this study, we investigate the magnetic properties of interconnected permalloy nanowire networks using micromagnetic simulations. The effects of interconnectivity on the hysteresis curves, coercivity, and remanence of the nanowire networks are analyzed. Our results reveal intriguing characteristics of the hysteresis curves, including nonmonotonic behaviors of coercivity as a function of the position of horizontal nanowires relative to vertical nanowires. By introducing horizontal nanowires at specific positions, the coercivity of the nanowire networks can be enhanced without altering the material composition. The normalized remanence remains relatively constant regardless of the position of the horizontal wires, although it is lower in the interconnected nanowire arrays compared to nonconnected arrays. These findings provide valuable insights into the design and optimization of nanowire networks for applications requiring tailored magnetic properties.

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Khurshid, Hafsa, Rahana Yoosuf, Bashar Afif Issa, Atta G. Attaelmanan, and George Hadjipanayis. "Tuning Easy Magnetization Direction and Magnetostatic Interactions in High Aspect Ratio Nanowires." Nanomaterials 11, no. 11 (November 12, 2021): 3042. http://dx.doi.org/10.3390/nano11113042.

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Cobalt nanowires have been synthesized by electrochemical deposition using track-etched anodized aluminum oxide (AAO) templates. Nanowires with varying spacing-to-diameter ratios were prepared, and their magnetic properties were investigated. It is found that the nanowires’ easy magnetization direction switches from parallel to perpendicular to the nanowire growth direction when the nanowire’s spacing-to-diameter ratio is reduced below 0.7, or when the nanowires’ packing density is increased above 5%. Upon further reduction in the spacing-to-diameter ratio, nanowires’ magnetic properties exhibit an isotropic behavior. Apart from shape anisotropy, strong dipolar interactions among nanowires facilitate additional uniaxial anisotropy, favoring an easy magnetization direction perpendicular to their growth direction. The magnetic interactions among the nanowires were studied using the standard method of remanence curves. The demagnetization curves and Delta m (Δm) plots showed that the nanowires interact via dipolar interactions that act as an additional uniaxial anisotropy favoring an easy magnetization direction perpendicular to the nanowire growth direction. The broadening of the dipolar component of Δm plots indicate an increase in the switching field distribution with the increase in the nanowires’ diameter. Our findings provide an important insight into the magnetic behavior of cobalt nanowires, meaning that it is crucial to design them according to the specific requirements for the application purposes.

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Rai, Rajesh K., and Chandan Srivastava. "Nonequilibrium Microstructures for Ag–Ni Nanowires." Microscopy and Microanalysis 21, no. 2 (February 6, 2015): 491–97. http://dx.doi.org/10.1017/s1431927615000069.

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AbstractThis work illustrates that a variety of nanowire microstructures can be obtained either by controlling the nanowire formation kinetics or by suitable thermal processing of as-deposited nanowires with nonequilibrium metastable microstructure. In the present work, 200-nm diameter Ag–Ni nanowires with similar compositions, but with significantly different microstructures, were electrodeposited. A 15 mA deposition current produced nanowires in which Ag-rich crystalline nanoparticles were embedded in a Ni-rich amorphous matrix. A 3 mA deposition current produced nanowires in which an Ag-rich crystalline phase formed a backbone-like configuration in the axial region of the nanowire, whereas the peripheral region contained Ni-rich nanocrystalline and amorphous phases. Isothermal annealing of the nanowires illustrated a phase evolution pathway that was extremely sensitive to the initial nanowire microstructure.

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Aish, Mohamed Mahmud, and Mikhail D. Starostenkov. "Deformation and Fracture of Metallic Nanowires." Solid State Phenomena 258 (December 2016): 277–80. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.277.

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A many-body interatomic potential for metallic nanowires within the second-moment approximation of the tight-binding model (the Cleri-Rosato potential) was employed to carry out three dimensional molecular dynamics simulations. Molecular dynamics simulation results for metallic nanowires at various temperature are presented. The stress–time and stress length curves for nanowires are simulated. The breaking and yield stress of nanowires are dependent on the Volume and temperature. The necking, Plastic deformation, slipping domain, twins, clusters, microspores and break-up phenomena of nanowire are demonstrated. Stress decreases with increasing nanowire volume and temperature. The final breaking position occurs at the central part of the nanowire when it is short, as the nanowire length increases the breaking position gradually shifts to the ends.

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11

Son, Kwang-Soo, Dong Hyun Lee, Jae-Woong Choung, Yong Bum Pyun, Won Il Park, Taeseup Song, and Ungyu Paik. "Catalyst-free synthesis and cathodoluminescent properties of ZnO nanobranches on Si nanowire backbones." Journal of Materials Research 23, no. 12 (December 2008): 3403–8. http://dx.doi.org/10.1557/jmr.2008.0400.

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We report the catalyst-free synthesis of ZnO nanobranches on Si nanowires using metalorganic chemical vapor deposition. The formation of single-crystalline ZnO nanobranches on Si nanowire backbones has been confirmed by lattice resolved transmission electron microscopy. Depending on the growth parameters, especially the growth temperature, the morphology and size of the ZnO nanobranches evolved from nanothorn-shaped (at 350 °C) to nanoneedle-shaped structures (at 500 °C). When the growth temperature was further increased to 800 °C, thin ZnO nanowire branches grew out of the Si nanowire backbones coated with thin ZnO shells, whereas no ZnO branch was formed on bare Si nanowires due to limited nucleation. The growth behavior was further exploited to fabricate ZnO/Si nanowire networks by growing the ZnO nanowires selectively on laterally aligned Si–ZnO core-shell nanowire arrays. In addition, cathodoluminescent properties of ZnO nanobranches on Si nanowire backbones are discussed with respect to position and size.

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12

Dubrovskii, Vladimir G. "Theory of MBE Growth of Nanowires on Adsorbing Substrates: The Role of the Shadowing Effect on the Diffusion Transport." Nanomaterials 12, no. 7 (March 24, 2022): 1064. http://dx.doi.org/10.3390/nano12071064.

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A new model for nanowire growth by molecular beam epitaxy is proposed which extends the earlier approaches treating an isolated nanowire to the case of ensembles of nanowires. I consider an adsorbing substrate on which the arriving growth species (group III adatoms for III-V nanowires) may diffuse to the nanowire base and subsequently to the top without desorption. Analytical solution for the nanowire length evolution at a constant radius shows that the shadowing of the substrate surface is efficient and affects the growth kinetics from the very beginning of growth in dense enough ensembles of nanowires. The model fits quite well the kinetic data on different Au-catalyzed and self-catalyzed III-V nanowires. This approach should work equally well for vapor-liquid-solid and catalyst-free nanowires grown by molecular beam epitaxy and related deposition techniques on unpatterned or masked substrates.

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13

Lin, You Dao, Xin Wen, Lai Sen Wang, Guang Hui Yue, and Dong Liang Peng. "Structure and Optical Properties of SnS Nanowire Arrays Prepared with Two-Step Method." Advanced Materials Research 476-478 (February 2012): 1519–22. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1519.

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Abstract. Single crystalline SnS nanowire arrays have been synthesized by sulfurating the Sn nanowire arrays which were prepared with the electrochemical deposition. The obtained SnS nanowire arrays are charactered with the XRD, SEM, TEM and the UV/Visible/NIR spectrophotometer. And the results indicate that the nanowires with an average diameter of 50 nm and a length of several tens micrometers, which same with the as prepared Sn nanowires. There are two absorption peaks indicate with the direct and indirect bandgaps about the orthorhombic SnS nanowire arrays.

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Marasović, Ivan, Željka Milanović, and Tihomir Betti. "Resistance Fluctuations in GaAs Nanowire Grids." Journal of Nanomaterials 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/428390.

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We present a numerical study on resistance fluctuations in a series of nanowire-based grids. Each grid is made of GaAs nanowires arranged in parallel with metallic contacts crossing all nanowires perpendicularly. Electrical properties of GaAs nanowires known from previous experimental research are used as input parameters in the simulation procedure. Due to the nonhomogeneous doping, the resistivity changes along nanowire. Allowing two possible nanowire orientations (“upwards” or “downwards”), the resulting grid is partially disordered in vertical direction which causes resistance fluctuations. The system is modeled using a two-dimensional random resistor network. Transfer-matrix computation algorithm is used to calculate the total network resistance. It is found that probability density function (PDF) of resistance fluctuations for a series of nanowire grids changes from Gaussian behavior towards the Bramwell-Holdsworth-Pinton distribution when both nanowire orientations are equally represented in the grid.

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Hang, Tian, Hui-Jiuan Chen, Shuai Xiao, Chengduan Yang, Meiwan Chen, Jun Tao, Han-ping Shieh, Bo-ru Yang, Chuan Liu, and Xi Xie. "TiO 2 nanowire-templated hierarchical nanowire network as water-repelling coating." Royal Society Open Science 4, no. 12 (December 2017): 171431. http://dx.doi.org/10.1098/rsos.171431.

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Extraordinary water-repelling properties of superhydrophobic surfaces make them novel candidates for a great variety of potential applications. A general approach to achieve superhydrophobicity requires low-energy coating on the surface and roughness on nano- and micrometre scale. However, typical construction of superhydrophobic surfaces with micro-nano structure through top-down fabrication is restricted by sophisticated fabrication techniques and limited choices of substrate materials. Micro-nanoscale topographies templated by conventional microparticles through surface coating may produce large variations in roughness and uncontrollable defects, resulting in poorly controlled surface morphology and wettability. In this work, micro-nanoscale hierarchical nanowire network was fabricated to construct self-cleaning coating using one-dimensional TiO 2 nanowires as microscale templates. Hierarchical structure with homogeneous morphology was achieved by branching ZnO nanowires on the TiO 2 nanowire backbones through hydrothermal reaction. The hierarchical nanowire network displayed homogeneous micro/nano-topography, in contrast to hierarchical structure templated by traditional microparticles. This hierarchical nanowire network film exhibited high repellency to both water and cell culture medium after functionalization with fluorinated organic molecules. The hierarchical structure templated by TiO 2 nanowire coating significantly increased the surface superhydrophobicity compared to vertical ZnO nanowires with nanotopography alone. Our results demonstrated a promising strategy of using nanowires as microscale templates for the rational design of hierarchical coatings with desired superhydrophobicity that can also be applied to various substrate materials.

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Peng, Yongqian, Yicong Ye, Cuijuan Yu, Zhen Wang, Yuanxi Xu, and Yongguo Du. "Study on the Preparation and Performance of Low-Temperature Sintering and High-Thermal-Conductivity Silver Nanowire Film." Metals 13, no. 4 (April 21, 2023): 819. http://dx.doi.org/10.3390/met13040819.

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This paper proposes a new silver nanoscale joining material, silver nanowire film, as an alternative joining approach for high-power and large-size chip packaging. The silver nanowire film was prepared by pressing filtration with silver nanowire that was synthesized using the polyol method. We found that the tensile strength of the film reached 3.40 MPa and the content of the silver reached up to 99.0 wt%. This paper further studies the influence of the size of silver nanowires on the performance of silver nanowire film. The experimental results show that the silver nanowire films prepared with silver nanowires with longer lengths and smaller diameters displayed better performances. The silver nanowire film with the best performance was prepared using silver nanowire with a diameter of 88 nm and a length of 29 μm. The thermal resistance of the sintered silver nanowire film that was hot-pressed at 250 °C 10 MPa was only 1.28 K∙W−1. The shear strength of the sintered joint was 56.4 MPa, and the fracture that occurred in the sintered silver nanowire film displayed a good plasticity.

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Kim, Kangil, Jae Keun Lee, Seung Ju Han, and Sangmin Lee. "A Novel Top-Down Fabrication Process for Vertically-Stacked Silicon-Nanowire Array." Applied Sciences 10, no. 3 (February 8, 2020): 1146. http://dx.doi.org/10.3390/app10031146.

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Silicon nanowires are widely used for sensing applications due to their outstanding mechanical, electrical, and optical properties. However, one of the major challenges involves introducing silicon-nanowire arrays to a specific layout location with reproducible and controllable dimensions. Indeed, for integration with microscale structures and circuits, a monolithic wafer-level process based on a top-down silicon-nanowire array fabrication method is essential. For sensors in various electromechanical and photoelectric applications, the need for silicon nanowires (as a functional building block) is increasing, and thus monolithic integration is highly required. In this paper, a novel top-down method for fabricating vertically-stacked silicon-nanowire arrays is presented. This method enables the fabrication of lateral silicon-nanowire arrays in a vertical direction, as well as the fabrication of an increased number of silicon nanowires on a finite dimension. The proposed fabrication method uses a number of processes: photolithography, deep reactive-ion etching, and wet oxidation. In applying the proposed method, a vertically-aligned silicon-nanowire array, in which a single layer consists of three vertical layers with 20 silicon nanowires, is fabricated and analyzed. The diamond-shaped cross-sectional dimension of a single silicon nanowire is approximately 300 nm in width and 20 μm in length. The developed method is expected to result in highly-sensitive, reproducible, and low-cost silicon-nanowire sensors for various biomedical applications.

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Yang, Dae-Jin, Seyun Kim, Hiesang Sohn, Kyoung-Seok Moon, Woo Hyeong Sim, Hyung Mo Jeong, and Weon Ho Shin. "Effect of Flash Light Sintering on Silver Nanowire Electrode Networks." Materials 13, no. 2 (January 15, 2020): 404. http://dx.doi.org/10.3390/ma13020404.

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We investigated the flash light sintering process to effectively reduce electrical resistance in silver nanowire networks. The optimum condition of the flash light sintering process reduces the electrical resistance by ~20%, while the effect of the conventional thermal annealing processes is rather limited for silver nanowire networks. After flash light sintering, the morphology of the junction between the silver nanowires changes to a mixed-phase structure of the two individual nanowires. This facile and fast process for silver nanowire welding could be highly advantageous to the mass production of silver nanowire networks.

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Cao, Bing Qiang, Hao Ming Wei, Xi Lun Hu, and Hai Bo Gong. "Polar and Nonpolar ZnO Nanowire QWs Grown with PLD Using Nanowire Arrays with Tuning Density as Physical Templates." Materials Science Forum 688 (June 2011): 207–12. http://dx.doi.org/10.4028/www.scientific.net/msf.688.207.

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The encountered difficulties that prevent ZnO nanowires from being used as light-emitters are p-type doping and quantum well (QW) integration. The growth of homogenous nanowire quantum wells is usually influenced by the shadowing effect associated with nanowire growth density. In this paper, based on the growth density control of nanowire array, a new two-step pulsed laser deposition (PLD) strategy was demonstrated to grow two kinds of ZnO nanowire QWs, e.g. radial nonpolar QW and axial polar QW. The growth-density control of ZnO nanowires was realised by introducing a wetting layer and adjusting the substrate-target distances. The structural and optical characterizations of these two kinds of nanowire QWs prove that the radial nanowire QWs are more homogenous than axial QWs, which also show better optical properties.

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Wu, Chi-Chang. "Silicon Nanowires Length and Numbers Dependence on Sensitivity of the Field-Effect Transistor Sensor for Hepatitis B Virus Surface Antigen Detection." Biosensors 12, no. 2 (February 12, 2022): 115. http://dx.doi.org/10.3390/bios12020115.

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Silicon nanowire field effect transistor (NWFET) sensors have been demonstrated to have high sensitivity, are label free, and offer specific detection. This study explored the effect of nanowire dimensions on sensors’ sensitivity. We used sidewall spacer etching to fabricate polycrystalline silicon NWFET sensors. This method does not require expensive nanoscale exposure systems and reduces fabrication costs. We designed transistor sensors with nanowires of various lengths and numbers. Hepatitis B surface antigen (HBsAg) was used as the sensing target to explore the relationships of nanowire length and number with biomolecule detection. The experimental results revealed that the sensor with a 3 µm nanowire exhibited high sensitivity in detecting low concentrations of HBsAg. However, the sensor reached saturation when the biomolecule concentration exceeded 800 fg/mL. Sensors with 1.6 and 5 µm nanowires exhibited favorable linear sensing ranges at concentrations from 800 ag/mL to 800 pg/mL. The results regarding the number of nanowires revealed that the use of few nanowires in transistor sensors increases sensitivity. The results demonstrate the effects of nanowire dimensions on the silicon NWFET biosensors.

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Du, Yong, Hao Niu, Jun Li, Yunchen Dou, Shirley Shen, Runping Jia, and Jiayue Xu. "Morphologies Tuning of Polypyrrole and Thermoelectric Properties of Polypyrrole Nanowire/Graphene Composites." Polymers 10, no. 10 (October 13, 2018): 1143. http://dx.doi.org/10.3390/polym10101143.

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Polypyrrole (PPy) with different morphologies (e.g., particles, nanotubes, and nanowires) were successfully prepared by adding or without adding different kinds of surfactants through a chemical oxidative polymerization method, respectively. The results show that the morphologies of PPy can be effectively controlled and have a significantly effects on their thermoelectric properties. The PPy nanowires exhibit the highest electrical conductivity and Seebeck coefficient among the various PPy morphologies, such as particles, nanotubes, and nanowires, so PPy nanowires were chosen to prepare PPy nanowire/graphene thermoelectric composites via a soft template polymerization method using cetyltrimethyl ammonium bromide as the template. Both electrical conductivity and Seebeck coefficient of the PPy nanowire/graphene composites increased as the content of graphene increases from 0 to 20 wt %, and as the measured temperature increases from 300 K to 380 K, which leds to the same trend for the power factor. A highest power factor of 1.01 μWm−1K−2 at ~380 K was obtained for the PPy nanowire/graphene composites with 20 wt % PPy nanowire, which is about 3.3 times higher than that of the pure PPy nanowire.

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Sun, Yue Ling, Ying Dai, L. Q. Zhou, and Wen Chen. "Single-Crystal Iron Nanowire Arrays." Solid State Phenomena 121-123 (March 2007): 17–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.17.

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Highly ordered single-crystal iron nanowire arrays with different diameters have been fabricated in anodic aluminum oxide (AAO) templates by DC electrodeposition method. The Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) show that the iron nanowires are highly uniform and exhibit a single crystal structure. The X-ray diffraction (XRD) patterns of iron nanowire arrays indicate that most of the iron nanowire arrays have the obvious preferred orientation along the [200] direction. From the hysteresis loops of the iron nanowires, it reveals that the easy magnetization axes of nanowire arrays are along the long axis. The sample with smaller diameter (d=35nm) has a high square ratio (up to 98%) and a high coercive filed (1265Oe) when the external magnetic field is applied along axis of the nanowires. When the diameter decreases, the square ratio and the coercive field increase due to the single-domain structure and the strong shape anisotropy in the smaller diameter nanowire arrays.

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Hsieh, S. H., S. T. Ho, and W. J. Chen. "Silicon Nanowires with MoSxand Pt as Electrocatalysts for Hydrogen Evolution Reaction." Journal of Nanomaterials 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/6974646.

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A convenient method was used for synthesizing Pt-nanoparticle/MoSx/silicon nanowires nanocomposites. Obtained Pt-MoSx/silicon nanowires electrocatalysts were characterized by transmission electron microscopy (TEM). The hydrogen evolution reaction efficiency of the Pt-MoSx/silicon nanowire nanocomposite catalysts was assessed by examining polarization and electrolysis measurements under solar light irradiations. The electrochemical characterizations demonstrate that Pt-MoSx/silicon nanowire electrodes exhibited an excellent catalytic activity for hydrogen evolution reaction in an acidic electrolyte. The hydrogen production capability of Pt-MoSx/silicon nanowires is also comparable toMoSx/silicon nanowires and Pt/silicon nanowires. Electrochemical impedance spectroscopy experiments suggest that the enhanced performance of Pt-MoSx/silicon nanowires can be attributed to the fast electron transfer between Pt-MoSx/silicon nanowire electrodes and electrolyte interfaces.

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Tatsuoka, Hirokazu, Wen Li, Er Chao Meng, Daisuke Ishikawa, and Kaito Nakane. "Syntheses and Structural Control of Silicide, Oxide and Metallic Nano-Structured Materials." Solid State Phenomena 213 (March 2014): 35–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.213.35.

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The structural control and morphological modification of a series of silicide, oxide and Ag metal nanostructures have been further discussed with reviews of nanostructure syntheses, such as CrSi2 nanowire bundles dendrites, MoSi2 nanosheets, α-Fe2O3 nanowires nanobelts, CuO/Cu2O nanowire axial heterostructures, ZrO2/SiOx and CrSi2/SiOx core/shell nanowires. In addition, the syntheses of Ag three-dimensional dendrites, two-dimensional dendrites, two-dimensional fractal structures, particles and nanowires also were discussed. Moreover, the structural and morphological properties of the nanostructures were examined. The structural control and morphological modifications of the nanostructures have been successfully demonstrated by the appropriate thermal treatments with specific starting materials. A large volume of silicide nanowire bundles, large area of oxide nanowire arrays and large area Ag nanostructure coatings were successfully fabricated.

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Koo, B. R., J. W. Bae, and H. J. Ahn. "Improved Long-Term Stability of Transparent Conducting Electrodes Based on Double-Laminated Electrosprayed Antimony Tin Oxides and Ag Nanowires." Archives of Metallurgy and Materials 62, no. 2 (June 1, 2017): 1275–79. http://dx.doi.org/10.1515/amm-2017-0192.

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AbstractWe fabricated double-laminated antimony tin oxide/Ag nanowire electrodes by spin-coating and electrospraying. Compared to pure Ag nanowire electrodes and single-laminated antimony tin oxide/Ag nanowire electrodes, the double-laminated antimony tin oxide/Ag nanowire electrodes had superior transparent conducting electrode performances with sheet resistance ~19.8 Ω/□ and optical transmittance ~81.9%; this was due to uniform distribution of the connected Ag nanowires because of double lamination of the metallic Ag nanowires without Ag aggregation despite subsequent microwave heating at 250°C. They also exhibited excellent and superior long-term chemical and thermal stabilities and adhesion to substrate because double-laminated antimony tin oxide thin films act as the protective layers between Ag nanowires, blocking Ag atoms penetration.

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XU, JIE, WEI LIU, GUO-AN CHENG, and RUI-TING ZHENG. "SYNTHESIS AND OPTICAL PROPERTIES OF LARGE-SCALE ALIGNED ALUMINA NANOWIRE ARRAYS." Modern Physics Letters B 24, no. 02 (January 20, 2010): 151–60. http://dx.doi.org/10.1142/s0217984910022330.

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Ordered large-scale alumina nanowire arrays on the surface of porous anodic alumina membranes (AAMs) have been synthesized by chemical etching. The analysis shows that amorphous alumina nanowires directly formed from AAMs have uniform size and shape. The mean length and mean diameter of alumina nanowires are about 6 μm and 24 nm, respectively. It is observed that chemical etching parameters affect the synthesis of alumina nanowires and preferable experimental conditions for the synthesis of alumina nanowire arrays. The intensity of photoluminescence excited from alumina nanowire is affected by post-annealing temperatures. The mechanisms for the synthesis and PL emission of alumina nanowires are discussed.

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He, Tao, Yukun Zhao, Xiaodong Zhang, Wenkui Lin, Kai Fu, Chi Sun, Fengfeng Shi, et al. "Solar-blind ultraviolet photodetector based on graphene/vertical Ga2O3 nanowire array heterojunction." Nanophotonics 7, no. 9 (August 28, 2018): 1557–62. http://dx.doi.org/10.1515/nanoph-2018-0061.

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AbstractIn this paper, a solar-blind ultraviolet photodetector (PD) based on the graphene/vertical Ga2O3 nanowire array heterojunction was proposed and demonstrated. To the best of our knowledge, it is the first time that vertical Ga2O3 nanowire arrays have been realized. Ga2O3 nanowires were obtained by thermally oxidizing GaN nanowires grown by molecular beam epitaxy on n-doped Si substrate. Then, a monolayer graphene film was transferred to Ga2O3 nanowires to form the graphene/vertical Ga2O3 nanowire array heterojunction and transparent electrodes. The fabricated device exhibited a responsivity (R) of 0.185 A/W and rejection ratio (R258 nm/R365 nm) of 3×104 at the bias of −5 V. Moreover, the fast response times of this PD were 9 and 8 ms for the rise and decay times under 254 nm illumination, respectively, which are attributed to the unique properties of nanowire arrays and the graphene/vertical Ga2O3 nanowire array heterojunction structure.

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Lee, Geun-Hyoung. "Branched MgO Nanowires Synthesized by Thermal Evaporation Method in Air at Atmospheric Pressure." Korean Journal of Metals and Materials 61, no. 6 (June 5, 2023): 444–48. http://dx.doi.org/10.3365/kjmm.2023.61.6.444.

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MgO nanowires with a branched structure were fabricated using a thermal evaporation method in air at atmospheric pressure. The branched MgO nanowire was made up of two parts: a primary central nanowire trunk and lots of secondary nanowire branches. The branched MgO nanowires had a 4-fold symmetrical structure. The secondary nanowire branches grew perpendicular on the four side facets of the central nanowire trunks with square cross-sections. The nanowire branches also grew in a single row and were vertically well aligned in the same direction with each other. The scanning electron microscopy images of the branched nanowires grown at 1000<sup>o</sup>C showed that the diameter of branches gradually decreased along the growth direction and no catalyst particle was found at the tips of the branches, indicating that the branches were grown by a vapor-solid process. For the branched nanowires grown at 1150<sup>o</sup>C, spherical particles which were shown to be catalysts were observed at the tips of the branches. The chemical analysis by energy dispersive spectroscopy showed that the spherical particles were composed of Mg and O elements. These results suggest that the branches’ growth resulted from a self-catalyzed vapor-liquid-solid process. The structural characterization by X-ray diffraction confirmed that the branched MgO nanowires had a cubic lattice structure. The room temperature cathodoluminescence spectra of the branched MgO nanowires exhibited a very strong visible emission which was associated with oxygen vacancies.

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Hu, Chen Yang, Xiao Bo Zhang, Xiao Yun Li, and Hui Chen. "Catalytic Membrane and their Photocatalytic Properties." Applied Mechanics and Materials 204-208 (October 2012): 4215–18. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4215.

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A solution method was developed to synthesized heteronanostructure of Ag nanoparticles on titanate nanowires, and then flexible photocatalytic Films were made by these nanowires. The nanowire is about 50 nm in diameter, several hundreds micrometers in length. The size of the Ag nanoparticle grafted on the nanowire is about 50 to 100 nm. The nanowire Film showed excellent photocatalytic activity to decompose the methamidophos and satisfactory antibacterial effect to kill Escherichia coli.

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Waclawik, Eric R., Jin Chang, Andrea Ponzoni, Isabella Concina, Dario Zappa, Elisabetta Comini, Nunzio Motta, Guido Faglia, and Giorgio Sberveglieri. "Functionalised zinc oxide nanowire gas sensors: Enhanced NO2 gas sensor response by chemical modification of nanowire surfaces." Beilstein Journal of Nanotechnology 3 (May 2, 2012): 368–77. http://dx.doi.org/10.3762/bjnano.3.43.

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Surface coating with an organic self-assembled monolayer (SAM) can enhance surface reactions or the absorption of specific gases and hence improve the response of a metal oxide (MOx) sensor toward particular target gases in the environment. In this study the effect of an adsorbed organic layer on the dynamic response of zinc oxide nanowire gas sensors was investigated. The effect of ZnO surface functionalisation by two different organic molecules, tris(hydroxymethyl)aminomethane (THMA) and dodecanethiol (DT), was studied. The response towards ammonia, nitrous oxide and nitrogen dioxide was investigated for three sensor configurations, namely pure ZnO nanowires, organic-coated ZnO nanowires and ZnO nanowires covered with a sparse layer of organic-coated ZnO nanoparticles. Exposure of the nanowire sensors to the oxidising gas NO2 produced a significant and reproducible response. ZnO and THMA-coated ZnO nanowire sensors both readily detected NO2 down to a concentration in the very low ppm range. Notably, the THMA-coated nanowires consistently displayed a small, enhanced response to NO2 compared to uncoated ZnO nanowire sensors. At the lower concentration levels tested, ZnO nanowire sensors that were coated with THMA-capped ZnO nanoparticles were found to exhibit the greatest enhanced response. ΔR/R was two times greater than that for the as-prepared ZnO nanowire sensors. It is proposed that the ΔR/R enhancement in this case originates from the changes induced in the depletion-layer width of the ZnO nanoparticles that bridge ZnO nanowires resulting from THMA ligand binding to the surface of the particle coating. The heightened response and selectivity to the NO2 target are positive results arising from the coating of these ZnO nanowire sensors with organic-SAM-functionalised ZnO nanoparticles.

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Yang, Zhan, Masahiro Nakajima, Yasuhito Ode, and Toshio Fukuda. "Tungsten/Platinum Hybrid Nanowire Growth via Field Emission Using Nanorobotic Manipulation." Journal of Nanotechnology 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/386582.

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This paper reports tungsten-platinum hybrid nanowire growth via field emission, based on nanorobotic manipulation within a field emission scanning electron microscope (FESEM). A multiwalled carbon nanotube (MWCNT) was used as the emitter, and a tungsten probe was used as the anode at the counterposition, by way of nanomanipulation. By independently employing trimethylcyclopentadienyl platinum (CpPtMe3) and tungsten hexacarbonyl (W(CO)6) as precursors, the platinum nanowire grew on the tip of the MWCNT emitter. Tungsten nanowires then grew on the tip of the platinum nanowire. The hybrid nanowire length wascontrolled by nanomanipulation. Their purity was evaluated using energy-dispersive X-ray spectroscopy (EDS). Thus, it is possible to fabricate various metallic hybrid nanowires by changing the precursor materials. Hybrid nanowires have various applications in nanoelectronics, nanosensor devices, and nanomechanical systems.

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Zhang, Weina, Mingcong Wen, Pu Liu, Guowei Yang, and Hongxiang Lei. "Microsphere-assisted manipulation of a single Ag nanowire." Nanophotonics 10, no. 10 (July 9, 2021): 2729–36. http://dx.doi.org/10.1515/nanoph-2021-0234.

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Abstract Metal nanowires are promising building blocks for optoelectronic nanodevices, so their independent and precise manipulation is urgently needed. However, the direct optical manipulation methods are severely hampered due to the high absorption and scattering characteristics of the metal nanowires. Here, a microsphere-assisted indirect optical manipulation method is proposed, and precise manipulation of a single Ag nanowire is demonstrated in liquid. The microsphere is actuated to rotate to generate a microvortex by dynamic optical traps. Under the action of shear stress, the Ag nanowire within the microvortex can be controllably rotated and accurately orientated. By manipulating the position of the microsphere using a single optical trap, a precise positioning of the nanowire can be achieved under the action of pushing force. On this basis, the Ag nanowire-based structures were assembled. This indirect optical manipulation avoids the direct interaction between the light and the nanowires, which makes it independent of both the laser (power, wavelength) and the nanowire (material, size, and shape). Hence, the microsphere-assisted manipulation method is simple and general for independent and precise manipulation of a single nanowire, which is of great significance to the fabrication of optoelectronic nanodevices.

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Couteau, C., A. Larrue, C. Wilhelm, and C. Soci. "Nanowire Lasers." Nanophotonics 4, no. 1 (May 20, 2015): 90–107. http://dx.doi.org/10.1515/nanoph-2015-0005.

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Abstract:We review principles and trends in the use of semiconductor nanowires as gain media for stimulated emission and lasing. Semiconductor nanowires have recently been widely studied for use in integrated optoelectronic devices, such as light-emitting diodes (LEDs), solar cells, and transistors. Intensive research has also been conducted in the use of nanowires for subwavelength laser systems that take advantage of their quasione- dimensional (1D) nature, flexibility in material choice and combination, and intrinsic optoelectronic properties. First, we provide an overview on using quasi-1D nanowire systems to realize subwavelength lasers with efficient, directional, and low-threshold emission. We then describe the state of the art for nanowire lasers in terms of materials, geometry, andwavelength tunability.Next,we present the basics of lasing in semiconductor nanowires, define the key parameters for stimulated emission, and introduce the properties of nanowires. We then review advanced nanowire laser designs from the literature. Finally, we present interesting perspectives for low-threshold nanoscale light sources and optical interconnects. We intend to illustrate the potential of nanolasers inmany applications, such as nanophotonic devices that integrate electronics and photonics for next-generation optoelectronic devices. For instance, these building blocks for nanoscale photonics can be used for data storage and biomedical applications when coupled to on-chip characterization tools. These nanoscale monochromatic laser light sources promise breakthroughs in nanophotonics, as they can operate at room temperature, can potentially be electrically driven, and can yield a better understanding of intrinsic nanomaterial properties and surface-state effects in lowdimensional semiconductor systems.

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Ko, Han-Seung, Yeongjun Lee, Sung-Yong Min, Sung-Joo Kwon, and Tae-Woo Lee. "Large-scale metal nanoelectrode arrays based on printed nanowire lithography for nanowire complementary inverters." Nanoscale 9, no. 41 (2017): 15766–72. http://dx.doi.org/10.1039/c7nr06152h.

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Guo, Zi Zheng. "Effects of Length Fluctuation on Damage Spreading in a Triangular Nanowire Array." Advanced Materials Research 557-559 (July 2012): 649–53. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.649.

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A realistic quantum magnetic disk structure formed by a nanowire array is studied. The length fluctuation of the nanowires is described with Gaussian distributions. The magnetostatic interaction between two nanowires with different length and radius is derived. Based on that, we study the thermal stability of the nanowire array analytically and numerically by the damage spreading technique. The results show that when the magnetic cell’s spacing reduces (the storage density increases) or the nanowire length increases, damage spreading becomes difficult and the system stability is enhanced. In addition, the long-range magnetostatic interaction and the shape anisotropy make the system more stable and the nanowire length fluctuation influence is comparatively small.

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Kim, Joondong, Jong-Uk Bae, Wayne A. Anderson, Hyun-Mi Kim, and Ki-Bum Kim. "Solid-state growth of nickel silicide nanowire by the metal-induced growth method." Journal of Materials Research 21, no. 11 (November 2006): 2936–40. http://dx.doi.org/10.1557/jmr.2006.0364.

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Unique nanowire growth was accomplished at 575 °C by the metal-induced growth (MIG) method. This involved a spontaneous reaction between metal and Si. The deposited metal worked as a catalyst layer to grow nanowires in the solid state. Various metals (Ni, Co, and Pd) were used in MIG nanowire fabrication, and the Ni-induced case was successful in demonstrating that metal species should be the dominant factor for growing nanowires. The Ni to Si composition was studied by energy dispersive spectroscopy showing the Ni diffusion inside the nanowire as well as the Ni silicide layer. The practical application of the MIG nanowire was proved by fabricating nanoscale contacts.

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Samardak, Alexander S., Alexey V. Ognev, Ekaterina V. Sukovatitsina, Maxim E. Stebliy, Evgeny B. Modin, Liudmila A. Chebotkevich, R. Mahmoodi, M. G. Hosseini, S. M. Peighambari, and Farzad Nasirpouri. "Magnetic Behavior of Single Ni Nanowires and its Arrays Embedded in Highly Ordered Nanoporous Alumina Templates." Solid State Phenomena 215 (April 2014): 298–305. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.298.

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We report on magnetization reversal and geometry dependent magnetic anisotropy of Ni nanowire arrays electrodeposited in nanoporous alumina templates. Using micromagnetic simulation we have found that magnetization reversal mechanism in arrays with different nanowire diameters is curling. This magnetic behavior appears with propagation of the domain wall along a nanowire. The calculations have been proven by the analysis of hysteresis curves. To explain magnetic properties of closely-spaced nanowire arrays we have taken into consideration the magnetostatic interaction between adjacent nanowires and their structural defects, like as boundary grains. The investigated magnetic domain pattern of individual bended nanowires confirms rather complicated magnetization reversal mechanism than either coherent rotation of magnetization or its curling. Competition between the shape and magnetoelastic anisotropies can induce an unusual zigzag-like domain pattern in a single nanowire.

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38

Lee, Sun Sook, Hyun Jin Kim, Taek-Mo Chung, Young Kuk Lee, Chang Gyoun Kim, and Ki-Seok An. "Fabrication of Nanocomposite Based on ZnO Nanowire." Journal of Nanoscience and Nanotechnology 8, no. 9 (September 1, 2008): 4895–98. http://dx.doi.org/10.1166/jnn.2008.ic80.

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ZnO-NiO core–shell nanowires and Ni-ZnO nanoparticle–nanowire composites have been synthesized by atomic layer deposition (ALD) and H2 thermal reduction, respectively. Grown ZnO nanowires on Si substrates by vapor transport method were used as templates for the growth of NiO layers. In order to prevent interfacial interaction between deposited NiO and ZnO nanowires templates by the reaction at low temperature and to precisely control the thickness of NiO layer, ALD technique was suitably employed to form the ZnO-NiO core–shell nanowires. All surface area of ZnO nanowires was completely and uniformly covered by amorphous NiO layers at low temperature of 130 °C. The Ni-ZnO nanoparticle–nanowire composites were achieved by the thermal reduction of the ZnO-NiO core–shell nanowires at H2 atmosphere. The density of Ni nanoparticles on ZnO nanowires was roughly related to the pre-deposited NiO thickness and the inter-diffusion of Ni into the ZnO nanowire was not observed.

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Tsai, Jia Lin, and Cheng Fong Hong. "Investigate Mechanical Behavior of Gold Nanowire with Defect." Applied Mechanics and Materials 481 (December 2013): 49–54. http://dx.doi.org/10.4028/www.scientific.net/amm.481.49.

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This study aims to investigate the mechanical properties of gold nanowires using molecular dynamics (MD) simulation. The effects of the cross section size and the defects on the stress strain curves of the nanowires are examined. Moreover, the inception as well as the processing of dislocationin the nanowire is accounted by means of the centro-symmetry parameter and meanwhile, the energy variation during the dislocation is calculated. Results indicated for the pristine gold nanowire, as the cross section size increases, Youngs modulus increases, but the yielding stress decreases accordingly. Once the ultimate linear point is attained, the dislocation takes place abruptly from the nanowire surfaceand extended along the {111} planes. On the other hand, for the nanowire with defect, it was found that the dislocation is initiated from the defect which can significantlyreduce the yielding stress of the nanowires.

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Han, Song, Wu Jin, Tao Tang, Chao Li, Daihua Zhang, Xiaolei Liu, Jie Han, and Chongwu Zhou. "Controlled growth of gallium nitride single-crystal nanowires using a chemical vapor deposition method." Journal of Materials Research 18, no. 2 (February 2003): 245–49. http://dx.doi.org/10.1557/jmr.2003.0033.

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Chemical vapor deposition (CVD) using gold nanoparticles as the catalyst to grow high-quality single-crystal gallium nitride nanowires was developed. This method enables control over several important aspects of the growth, including control of the nanowire diameter by using monodispersed gold clusters, control of the nanowire location via e-beam patterning of the catalyst sites, and control of the nanowire orientation via epitaxial growth ona-plane sapphire substrates. Our work opens up new ways to use GaN nanowires as nanobuilding blocks.

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Deitz, Julia I., A. T. M. Golam Sarwar, Santino D. Carnevale, Tyler J. Grassman, Roberto C. Myers, and David W. McComb. "Nano-Cathodoluminescence Measurement of Asymmetric Carrier Trapping and Radiative Recombination in GaN and InGaN Quantum Disks." Microscopy and Microanalysis 24, no. 2 (April 2018): 93–98. http://dx.doi.org/10.1017/s143192761800017x.

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AbstractThe ability to characterize recombination and carrier trapping processes in group-III nitride-based nanowires is vital to further improvements in their overall efficiencies. While advances in scanning transmission electron microscope (STEM)-based cathodoluminescence (CL) have offered some insight into nanowire behavior, inconsistencies in nanowire emission along with CL detector limitations have resulted in the incomplete understanding in nanowire emission processes. Here, two nanowire heterostructures were explored with STEM-CL: a polarization-graded AlGaN nanowire light-emitting diode (LED) with a GaN quantum disk and a polarization-graded AlGaN nanowire with three different InGaN quantum disks. Most nanowires explored in this study did not emit. For the wires that did emit in both structures, they exhibited asymmetrical emission consistent with the polarization-induced electric fields in the barrier regions of the nano-LEDs. In the AlGaN/InGaN sample, two of the quantum disks exhibited no emission potentially due to the three-dimensional landscape of the sample or due to limitations in the CL detection.

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Chu, Kaiwen, Fangyuan Ma, Xiaojun Zhu, Xiaohao Jia, Zhitao Huang, Keqian Dong, Jiaqian Sun, et al. "Dimension-programmable CsPbBr₃ nanowires for plasmonic lasing with PDMS templated technique." Journal of Physics D: Applied Physics 55, no. 21 (February 25, 2022): 215104. http://dx.doi.org/10.1088/1361-6463/ac54d3.

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Abstract Lead halide perovskites have superior gain properties, and they can be mass produced into nanowire structures through chemical synthesis. The application of perovskite materials into plasmonic nanowire lasers lowers the lasing threshold and simplifies the fabrication process. However, in nearly all previous reported cases, perovskite nanowires were randomly distributed onto metallic substrate when using the method of dry-transferring or direct chemical vapor deposition. As a result, the dimensions of perovskite nanowires are random and undesired photonic mode lasing may take place instead. Here we present a method for preparing polydimethylsiloxane templated CsPbBr3 nanowires upon Au substrate in controllable dimensions with height below cutoff size, therefore advantageous for plasmonic nanowire laser applications. Additionally, low threshold plasmonic lasing is observed in ridge structure CsPbBr3 nanowire waveguide with a total height of merely 160 nm on Au substrate. A faster radiative decay rate than its photonic counterpart is evident, as well as a dominant polarization parallel to the nanowire axial solidify plasmonic lasing. This work paves the way for mass production of perovskite plasmonic nanolasers.

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SUZUKI, YOSHIKAZU, MARIE-HÉLÈNE BERGER, DANIELA D'ELIA, PIERRE ILBIZIAN, CHRISTIAN BEAUGER, ARNAUD RIGACCI, JEAN-FRANÇOIS HOCHEPIED, and PATRICK ACHARD. "SYNTHESIS AND MICROSTRUCTURE OF A NOVEL TiO2 AEROGEL–TiO2 NANOWIRE COMPOSITE." Nano 03, no. 05 (October 2008): 373–79. http://dx.doi.org/10.1142/s1793292008001222.

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TiO 2 aerogel–10 mol% TiO 2 nanowire composite was prepared by a sol–gel technique with the addition of TiO 2 nanowires to TiO 2 sol, followed by supercritical drying in CO 2. TiO 2 nanowires (anatase with minor rutile phases) as dispersoid were prepared by a hydrothermal process followed by calcination in air at 600°C. The TiO 2 nanowires were dispersed in a 2-propanol/ H 2 O / HNO 3 solution, and the mixture was added drop by drop to a tetrabutyl orthotitanate [i.e. Ti (IV) n-butoxide] solution in 2-propanol. After gelation, the TiO 2 alcogel– TiO 2 nanowire composite was dried in supercritical CO 2 to obtain the final, TiO 2 aerogel– TiO 2 nanowire composite. TEM analysis revealed that a unique "nanowire network" structure was formed within the mesoporous aerogel matrix. The aerogel– TiO 2 nanowire composite had a relatively large surface area 427 m2/g, with mesopores ~ 16 nm in diameter and a pore of volume of 1.63 cm3/g.

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Bai, Xiao Hui, and Dian Zhong Wen. "Study on Fabrication Pt Nanowires for Memristor." Applied Mechanics and Materials 58-60 (June 2011): 513–17. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.513.

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Introduced various preparation method of one dimensional nanowire and the merit and shortcoming of various methods, adopt two anodic oxidation method carry on oxadation to the aluminum sheet and Fabricate thickness about 15 ums, 50 nms nanohole diameter AAO template .In the H2PtCl6·6H2O+H3BO4 solutions carry on electrochemistry deposition to the AAO template.The deposited templates were characterized by scanning electron microscope (SEM ) , approval that growth speed of nanowires are the 1 um/h.After had electrochemistry deposited for 12h, the nanowire can pierce through AAO template.The length of nanowire is 15 ums, diameter is 50 nms. Nanowires are independent, they meet demand as conducting nanowires.

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Morbec, J. M., and R. H. Miwa. "Theoretical Study of Carbon Clusters in Silicon Carbide Nanowires." Journal of Nanotechnology 2011 (2011): 1–8. http://dx.doi.org/10.1155/2011/203423.

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Using first-principles methods we performed a theoretical study of carbon clusters in silicon carbide (SiC) nanowires. We examined small clusters with carbon interstitials and antisites in hydrogen-passivated SiC nanowires growth along the [100] and [111] directions. The formation energies of these clusters were calculated as a function of the carbon concentration. We verified that the energetic stability of the carbon defects in SiC nanowires depends strongly on the composition of the nanowire surface: the energetically most favorable configuration in carbon-coated [100] SiC nanowire is not expected to occur in silicon-coated [100] SiC nanowire. The binding energies of some aggregates were also obtained, and they indicate that the formation of carbon clusters in SiC nanowires is energetically favored.

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Wang, Zan, Hua Wei Guan, and Ke Dong Bi. "Thermal Conductivity of Hexagonal SiC Nanowire by Nonequilibrium Molecular Dynamics Simulations." Applied Mechanics and Materials 487 (January 2014): 102–5. http://dx.doi.org/10.4028/www.scientific.net/amm.487.102.

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Using nonequilibrium Molecular Dynamics method, thermal properties of hexagonal 4H-SiC and 6H-SiC nanowires are investigated. The quantum errors between realistic temperatures and Molecular dynamics temperatures are rectified based on Density Functional Theory. Thermal conductivities of 4H-SiC and 6H-SiC nanowires are both simulated from 50K to 800K. The scale effect on the thermal conductivity of nanowire is also investigated by varying the nanowires length from 10nm to 130nm. Results indicate, if the length of phonon mean free path is shorter than that of nanowire, phonon-surface scattering will surpass boundary scattering to contribute thermal resistances. Therefore, the thermal conductivity of 4H-SiC or 6H-SiC nanowire is mainly determined by the comparability between the length of nanowires and phonon mean free path.

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47

Arjmand, Tabassom, Maxime Legallais, Thi Thu Thuy Nguyen, Pauline Serre, Monica Vallejo-Perez, Fanny Morisot, Bassem Salem, and Céline Ternon. "Functional Devices from Bottom-Up Silicon Nanowires: A Review." Nanomaterials 12, no. 7 (March 22, 2022): 1043. http://dx.doi.org/10.3390/nano12071043.

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This paper summarizes some of the essential aspects for the fabrication of functional devices from bottom-up silicon nanowires. In a first part, the different ways of exploiting nanowires in functional devices, from single nanowires to large assemblies of nanowires such as nanonets (two-dimensional arrays of randomly oriented nanowires), are briefly reviewed. Subsequently, the main properties of nanowires are discussed followed by those of nanonets that benefit from the large numbers of nanowires involved. After describing the main techniques used for the growth of nanowires, in the context of functional device fabrication, the different techniques used for nanowire manipulation are largely presented as they constitute one of the first fundamental steps that allows the nanowire positioning necessary to start the integration process. The advantages and disadvantages of each of these manipulation techniques are discussed. Then, the main families of nanowire-based transistors are presented; their most common integration routes and the electrical performance of the resulting devices are also presented and compared in order to highlight the relevance of these different geometries. Because they can be bottlenecks, the key technological elements necessary for the integration of silicon nanowires are detailed: the sintering technique, the importance of surface and interface engineering, and the key role of silicidation for good device performance. Finally the main application areas for these silicon nanowire devices are reviewed.

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Peng, Xuanran, Jing Liu, Yaru Kang, Xu Mao, Wei Yan, Xiaohui Wang, Kong Liu, Rui Xu, Fuhua Yang, and Zhaofeng Li. "Coupling of Photonic and Plasmonic Modes for Double Nanowire Cavities." Photonics 10, no. 4 (April 6, 2023): 415. http://dx.doi.org/10.3390/photonics10040415.

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We analyze the coupling between double nanowire cavities for both photonic modes and plasmonic modes. When the spacing between nanowires reduces, a redshift of the resonant frequency of the symmetric mode and a blueshift of the resonant frequency of the antisymmetric mode are observed. Compared to single nanowire cavity modes, the Q factors of antisymmetric supermodes of double nanowires can be improved by 51% for photonic modes and by 24% for plasmonic modes. The mechanisms of Q factor improvement for photonic modes and plasmonic modes are studied based on the field distribution of radiations from the modes. This paper may contribute to research and applications for double nanowire lasers and nanowire laser arrays.

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Poduri, Shripriya, Mitra Dutta, and Michael Stroscio. "Photoluminescence Characterization of Cadmium Sulphide (CdS) Nanowires for Polarization Studies." Applied Physics Research 9, no. 6 (November 10, 2017): 26. http://dx.doi.org/10.5539/apr.v9n6p26.

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In this paper, the polarizing properties for CdS nanowire arrays were explored for their potential use in the design of nanowire based polarizers and optical switches. These free standing cadmium sulphide (CdS) nanowires were grown in anodized aluminum oxide (AAO) template via dc electrodeposition. Raman and photoluminescence (PL) measurements were investigated for parallel and perpendicular polarization with two orientations of the sample having light propagating parallel to the nanowire axis in one orientation and light propagating perpendicular to the nanowire axis in other orientation. Polarization-sensitive measurements show strong polarization anisotropy in the photoluminescence (PL) intensity measurements observed in parallel and perpendicular orientation to the long axis of a nanowire. The measured PL ratio, ρ, for parallel to perpendicular orientation was around 0.80- 0.85 which shows strong polarization anisotropy for the grown CdS nanowires. Strong peaks of A1 (TO) at 235 cm-1, E2 mode at 255 cm-1 along with 1 LO (longitudinal optical) at 303 cm-1, 2 LO peak at 604 cm-1 of the CdS nanowires were seen with different polarizations for Raman spectral studies. These polarization studies show that these dc electrodeposited grown CdS nanowire arrays are well suited for uses in polarization-based nanoscale devices such as in optical switches, and high performance photodetectors.

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Leshchenko E. D. and Dubrovskii V. G. "Modeling the growth of tapered nanowires on reflecting substrates." Technical Physics Letters 48, no. 12 (2022): 11. http://dx.doi.org/10.21883/tpl.2022.12.54937.19358.

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The formation of tapered self-catalyzed nanowires grown on reflecting substrates is studied theoretically. Within the model, the nanowire radius may be obtained as a function of length. The model describes the morphology of tapered nanowires. We study the influence of different growth parameters, including the III/V flux ratio and pitch, on the nanowire morphology. Keywords: III-V nanowires, morphology, self-focusing effect, modeling

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Journal articles on the topic 'Nanowire'

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