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Autore: Grafiati

Pubblicato: 8 giugno 2024

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1

PUI YEE, LOH, LIU CHENMIN, PUA WEICHENG, KAM FONG YU e CHIN WEE SHONG. "FACILE FABRICATION OF ONE-DIMENSIONAL MULTI-COMPONENT NANOSTRUCTURES USING POROUS ANODIZED ALUMINA MEMBRANE". COSMOS 06, n. 02 (dicembre 2010): 221–34. http://dx.doi.org/10.1142/s0219607710000577.

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In this short review, we report the facile fabrication of various interesting multi-component nanostructures including arrays of core-shell nanowires, multiwall nanotubes, segmented nanowires and multilayer stacked nanodisks, using anodized alumina membrane (AAM). We demonstrate that metallic (Cu, Ni and Au) and polymeric (PPV and PPy) one-dimensional (1D) arrays can be readily prepared by electrochemical deposition into the AAM. By optimizing the experimental design and conditions, we developed techniques to produce various multi-component nanostructures such as polymer/metal or metal/metal core-shell nanowires as well as nanotubes, with reasonably good control over both the length and the shell thickness of the nanostructures. Furthermore, we extend this method to make segmented nanowires as well as multilayer stacked nanodisks. Selective functionalization of the segmented nanowires resulted in end-on or side-on adhesion of nanowires during assembly. We illustrate the possibility of utilizing these 1D arrays to present patterns with luminescent and/or magnetic properties at this length scale.

2

Broaddus, Eric, Ann Wedell e Scott A. Gold. "Formic Acid Electrooxidation by a Platinum Nanotubule Array Electrode". International Journal of Electrochemistry 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/424561.

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One-dimensional metallic nanostructures such as nanowires, rods, and tubes have drawn much attention for electrocatalytic applications due to potential advantages that include fewer diffusion impeding interfaces with polymeric binders, more facile pathways for electron transfer, and more effective exposure of active surface sites. 1D nanostructured electrodes have been fabricated using a variety of methods, typically showing improved current response which has been attributed to improved CO tolerance, enhanced surface activity, and/or improved transport characteristics. A template wetting approach was used to fabricate an array of platinum nanotubules which were examined electrochemically with regard to the electrooxidation of formic acid. Arrays of 100 and 200 nm nanotubules were compared to a traditional platinum black catalyst, all of which were found to have similar surface areas. Peak formic acid oxidation current was observed to be highest for the 100 nm nanotubule array, followed by the 200 nm array and the Pt black; however, CO tolerance of all electrodes was similar, as were the onset potentials of the oxidation and reduction peaks. The higher current response was attributed to enhanced mass transfer in the nanotubule electrodes, likely due to a combination of both the more open nanostructure as well as the lack of a polymeric binder in the catalyst layer.

3

Searson, P. C., R. C. Cammarata e C. L. Chien. "Electrochemical processing of metallic nanowire arrays and nanocomposites". Journal of Electronic Materials 24, n. 8 (agosto 1995): 955–60. http://dx.doi.org/10.1007/bf02652967.

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4

Yin, A. J., J. Li, W. Jian, A. J. Bennett e J. M. Xu. "Fabrication of highly ordered metallic nanowire arrays by electrodeposition". Applied Physics Letters 79, n. 7 (13 agosto 2001): 1039–41. http://dx.doi.org/10.1063/1.1389765.

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5

Fernandes, David E., e Mário G. Silveirinha. "Bright and dark spatial solitons in metallic nanowire arrays". Photonics and Nanostructures - Fundamentals and Applications 12, n. 4 (agosto 2014): 340–49. http://dx.doi.org/10.1016/j.photonics.2014.04.003.

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6

Uzun, Ceren, Chandrasekhar Meduri, Niloofar Kahler, Luis Grave de Peralta, Jena M. McCollum, Michelle Pantoya, Golden Kumar e Ayrton A. Bernussi. "Photoinduced heat conversion enhancement of metallic glass nanowire arrays". Journal of Applied Physics 125, n. 1 (7 gennaio 2019): 015102. http://dx.doi.org/10.1063/1.5059423.

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7

Qiaoqiang Gan, Haifeng Hu, Huina Xu, Ke Liu, Suhua Jiang e A. N. Cartwright. "Wavelength-Independent Optical Polarizer Based on Metallic Nanowire Arrays". IEEE Photonics Journal 3, n. 6 (dicembre 2011): 1083–92. http://dx.doi.org/10.1109/jphot.2011.2173478.

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8

Zhang, X. Y., L. D. Zhang, W. Chen, G. W. Meng, M. J. Zheng, L. X. Zhao e F. Phillipp. "Electrochemical Fabrication of Highly Ordered Semiconductor and Metallic Nanowire Arrays". Chemistry of Materials 13, n. 8 (agosto 2001): 2511–15. http://dx.doi.org/10.1021/cm0007297.

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9

Zhang, Bo, Yu-Yan Weng, Xiao-Ping Huang, Mu Wang, Ru-Wen Peng, Nai-Ben Ming, Bingjie Yang, Nan Lu e Lifeng Chi. "Creating In-Plane Metallic-Nanowire Arrays by Corner-Mediated Electrodeposition". Advanced Materials 21, n. 35 (18 settembre 2009): 3576–80. http://dx.doi.org/10.1002/adma.200900730.

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10

Yee, Timothy D., Carla L. Watson, John D. Roehling, T. Yong-Jin Han e Anna M. Hiszpanski. "Fabrication and 3D tomographic characterization of nanowire arrays and meshes with tunable dimensions from shear-aligned block copolymers". Soft Matter 15, n. 24 (2019): 4898–904. http://dx.doi.org/10.1039/c9sm00303g.

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Abstract (sommario):

We demonstrate a scalable method to create metallic nanowire arrays and meshes over square-centimeter-areas with tunable sub-100 nm dimensions and geometries using the shear alignment of block copolymers.

11

Tatsuoka, Hirokazu, Wen Li, Er Chao Meng, Daisuke Ishikawa e Kaito Nakane. "Syntheses and Structural Control of Silicide, Oxide and Metallic Nano-Structured Materials". Solid State Phenomena 213 (marzo 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.

12

Roustaie, Farough, Sebastian Quednau, Florian Dassinger, Helmut F. Schlaak, Marcel Lotz e Stefan Wilfert. "In situsynthesis of metallic nanowire arrays for ionization gauge electron sources". Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena 34, n. 2 (marzo 2016): 02G103. http://dx.doi.org/10.1116/1.4939756.

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13

Oates, T. W. H., A. Keller, S. Noda e S. Facsko. "Self-organized metallic nanoparticle and nanowire arrays from ion-sputtered silicon templates". Applied Physics Letters 93, n. 6 (11 agosto 2008): 063106. http://dx.doi.org/10.1063/1.2959080.

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14

Wan, Qing, Jin Huang, Aixia Lu e Jia Sun. "Degenerately Mo-doped In2O3 nanowire arrays on In2O3 microwires with metallic behaviors". Journal of Applied Physics 106, n. 2 (15 luglio 2009): 024312. http://dx.doi.org/10.1063/1.3177334.

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15

Sharma, Gaurav, Ser Choong Chong, Liao Ebin, Cai Hui, Chee Lip Gan e Vaidyanathan Kripesh. "Fabrication of patterned and non-patterned metallic nanowire arrays on silicon substrate". Thin Solid Films 515, n. 7-8 (febbraio 2007): 3315–22. http://dx.doi.org/10.1016/j.tsf.2006.09.009.

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16

Liu, Xue, Yang Shao, Jin-Feng Li, Na Chen e Ke-Fu Yao. "Large-area and uniform amorphous metallic nanowire arrays prepared by die nanoimprinting". Journal of Alloys and Compounds 605 (agosto 2014): 7–11. http://dx.doi.org/10.1016/j.jallcom.2014.03.176.

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17

Deng, Zhaoxiang, e Chengde Mao. "DNA-Templated Fabrication of 1D Parallel and 2D Crossed Metallic Nanowire Arrays". Nano Letters 3, n. 11 (novembre 2003): 1545–48. http://dx.doi.org/10.1021/nl034720q.

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18

Liu, Xue, Yang Shao, Zhidong Han e Kefu Yao. "Morphology and structure evolution of metallic nanowire arrays prepared by die nanoimprinting". Science Bulletin 60, n. 6 (marzo 2015): 629–33. http://dx.doi.org/10.1007/s11434-014-0691-x.

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19

Tsai, S. H. "Formation and Field-Emission of Carbon Nanofiber Films on Metallic Nanowire Arrays". Electrochemical and Solid-State Letters 2, n. 5 (1999): 247. http://dx.doi.org/10.1149/1.1390800.

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20

Jung, Yeon Sik, Ju Ho Lee, Jeong Yong Lee e C. A. Ross. "Fabrication of Diverse Metallic Nanowire Arrays Based on Block Copolymer Self-Assembly". Nano Letters 10, n. 9 (8 settembre 2010): 3722–26. http://dx.doi.org/10.1021/nl1023518.

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21

Hsu, Shen-Yu, Ming-Chang Lee, Kuang-Li Lee e Pei-Kuen Wei. "Extraction enhancement in organic light emitting devices by using metallic nanowire arrays". Applied Physics Letters 92, n. 1 (2008): 013303. http://dx.doi.org/10.1063/1.2828712.

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22

Wang, Jun, Shuye Zhang, Zhiyuan Shi, Jinting Jiu, Chunhui Wu, Tohru Sugahara, Shijo Nagao, Katsuaki Suganuma e Peng He. "Nanoridge patterns on polymeric film by a photodegradation copying method for metallic nanowire networks". RSC Advances 8, n. 71 (2018): 40740–47. http://dx.doi.org/10.1039/c8ra02249f.

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Abstract (sommario):

A simple photocopying method based on selective polymer photodegradation is proposed for fabricating topographical nanopatterns. Nanoridges are structured on a polyethylene terephthalate film due to ultraviolet shielding of silver nanowire networks.

23

Zhan, Liang, Suqing Wang, Liang-Xin Ding, Zhong Li e Haihui Wang. "Binder-free Co–CoOx nanowire arrays for lithium ion batteries with excellent rate capability and ultra-long cycle life". Journal of Materials Chemistry A 3, n. 39 (2015): 19711–17. http://dx.doi.org/10.1039/c5ta02987b.

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24

Shah, Sachin N., Jonathan G. Heddle, David J. Evans e George P. Lomonossoff. "Production of Metallic Alloy Nanowires and Particles Templated Using Tomato Mosaic Virus (ToMV)". Nanomaterials 13, n. 19 (5 ottobre 2023): 2705. http://dx.doi.org/10.3390/nano13192705.

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We demonstrate a simple, low-energy method whereby tomato mosaic virus (ToMV) particles can be used to template the production of nanowires and particles consisting of alloys of gold (Au), platinum (Pt) and palladium (Pd) in various combinations. Selective nanowire growth within the inner channel of the particles was achieved using the polymeric capping agent polyvinylpyrrolidone (PVPK30) and the reducing agent ascorbic acid. The reaction conditions also resulted in the deposition of alloy nanoparticles on the external surface of the rods in addition to the nanowire structures within the internal cavity. The resulting materials were characterized using a variety of electron microscopic and spectroscopic techniques, which revealed both the structural and chemical composition of the alloys within the nanomaterials.

25

Jeon, Sangheon, Pyunghwa Han, Jeonghwa Jeong, Wan Sik Hwang e Suck Won Hong. "Highly Aligned Polymeric Nanowire Etch-Mask Lithography Enabling the Integration of Graphene Nanoribbon Transistors". Nanomaterials 11, n. 1 (25 dicembre 2020): 33. http://dx.doi.org/10.3390/nano11010033.

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Graphene nanoribbons are a greatly intriguing form of nanomaterials owing to their unique properties that overcome the limitations associated with a zero bandgap of two-dimensional graphene at room temperature. Thus, the fabrication of graphene nanoribbons has garnered much attention for building high-performance field-effect transistors. Consequently, various methodologies reported previously have brought significant progress in the development of highly ordered graphene nanoribbons. Nonetheless, easy control in spatial arrangement and alignment of graphene nanoribbons on a large scale is still limited. In this study, we explored a facile, yet effective method for the fabrication of graphene nanoribbons by employing orientationally controlled electrospun polymeric nanowire etch-mask. We started with a thermal chemical vapor deposition process to prepare graphene monolayer, which was conveniently transferred onto a receiving substrate for electrospun polymer nanowires. The polymeric nanowires act as a robust etching barrier underlying graphene sheets to harvest arrays of the graphene nanoribbons. On varying the parametric control in the process, the size, morphology, and width of electrospun polymer nanowires were easily manipulated. Upon O2 plasma etching, highly aligned arrays of graphene nanoribbons were produced, and the sacrificial polymeric nanowires were completely removed. The graphene nanoribbons were used to implement field-effect transistors in a bottom-gated configuration. Such approaches could realistically yield a relatively improved current on–off ratio of ~30 higher than those associated with the usual micro-ribbon strategy, with the clear potential to realize reproducible high-performance devices.

26

Ma, Guanshui, e Xiaoguang Wang. "Synthesis and Applications of One-Dimensional Porous Nanowire Arrays: A Review". Nano 10, n. 01 (gennaio 2015): 1530001. http://dx.doi.org/10.1142/s1793292015300017.

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In recent years, particular attention has been drawn to one-dimensional (1D) porous nanowires due to their high surface-to-volume ratios as well as the as-revealed excellent performance in varieties of applications. This review begins with a wide introduction to the as-reported various preparation methods for the typical 1D porous nanowires mainly consisting of template-free method (i.e., chemical etching, chemical vapor deposition, hydrothermal, electrospinning, gas-solid reaction, etc.) and template-assisted method (i.e., using hard template and soft template, respectively). Based on the classification of design and preparation strategies, the as-evolved various nonmetallic and metallic 1D nanoporous materials with varied microstructural features have been highlighted, followed by the corresponding description and discussion on their typical applications in catalysis, sensors, rechargeable batteries, solar cells, super-capacitors, water treatment, random lasers and so forth.

27

May, Brelon J., Elline C. Hettiaratchy, Camelia Selcu, Binbin Wang, Bryan D. Esser, David W. McComb e Roberto C. Myers. "Enhanced uniformity of III-nitride nanowire arrays on bulk metallic glass and nanocrystalline substrates". Journal of Vacuum Science & Technology B 37, n. 3 (maggio 2019): 031212. http://dx.doi.org/10.1116/1.5086184.

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28

Jia, Qi, Xin Ou, Manuel Langer, Benjamin Schreiber, Jörg Grenzer, Pablo F. Siles, Raul D. Rodriguez et al. "Ultra-dense planar metallic nanowire arrays with extremely large anisotropic optical and magnetic properties". Nano Research 11, n. 7 (luglio 2018): 3519–28. http://dx.doi.org/10.1007/s12274-017-1793-y.

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29

Fox, Cade B., Jean Kim, Erica B. Schlesinger, Hariharasudhan D. Chirra e Tejal A. Desai. "Fabrication of Micropatterned Polymeric Nanowire Arrays for High-Resolution Reagent Localization and Topographical Cellular Control". Nano Letters 15, n. 3 (5 febbraio 2015): 1540–46. http://dx.doi.org/10.1021/nl503872p.

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30

da Câmara Santa Clara Gomes, Tristan, Nicolas Marchal, Flavio Abreu Araujo e Luc Piraux. "Flexible thermoelectric films based on interconnected magnetic nanowire networks". Journal of Physics D: Applied Physics 55, n. 22 (3 febbraio 2022): 223001. http://dx.doi.org/10.1088/1361-6463/ac4d47.

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Abstract Recently, there has been increasing interest in the fabrication of flexible thermoelectric devices capable of cooling or recovering waste heat from hot surfaces with complex geometries. This paper reviews recent developments on three-dimensional networks of interconnected ferromagnetic nanowires, which offer new perspectives for the fabrication of flexible thermoelectric modules. The nanowire arrays are fabricated by direct electrodeposition into the crossed nanopores of polymeric templates. This low-cost, easy and reliable method allows control over the geometry, composition and morphology of the nanowire array. Here we report measured thermoelectric characteristics as a function of temperature and magnetic field of nanowire networks formed from pure metals (Co, Fe, Ni), alloys (NiCo, NiFe and NiCr) and FM/Cu multilayers (with FM = Co, Co50Ni50 and Ni80Fe20). Homogeneous nanowire arrays have high thermoelectric power factors, almost as high as their bulk constituents, and allow for positive and negative Seebeck coefficient values. These high thermoelectric power factors are essentially maintained in multilayer nanowires which also exhibit high magnetic modulability of electrical resistivity and Seebeck coefficient. This has been exploited in newly designed flexible thermoelectric switches that allow switching from an ‘off’ state with zero thermoelectric output voltage to an ‘on’ state that can be easily measured by applying or removing a magnetic field. Overall, these results are a first step towards the development of flexible thermoelectric modules that use waste heat to power thermally activated sensors and logic devices.

31

Yu, Paul K. L., Edward T. Yu e De Li Wang. "Advances in Semiconductor Nanostructures for Photonic Applications". Advanced Materials Research 410 (novembre 2011): 36. http://dx.doi.org/10.4028/www.scientific.net/amr.410.36.

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In this paper we present the concept and demonstration of novel photovoltaic and electro-optic devices, and photoelectrochemical cells based on various semiconductor nanostructures, specifically compound semiconductor quantum wells and nanowires, and the use of plasmonic and related scattering effects from metal or dielectric nanoparticles to increase efficiency of optical absorption. Quantum-well solar cells were fabricated with scattering from metallic or dielectric nanostructures incorporated to direct incident photons into lateral, optically confined paths with high electromagnetic field intensity within relatively thin multiple-quantum-well regions to maximize quantum efficiency of photon absorption. The internal structure of quantum wells in quantum-well solar cells was also analyzed and characterized; the incorporation of a suitable potential step within each quantum well was explored for improvement in power conversion efficiency. Vertical nanowire arrays were engineered to optimize optical confinement within the nanowires, and core-shell heterostructures were employed to achieve broad-spectrum absorption while maintaining high open-circuit voltages. Large linear electro-optic effect is observed in the nanowire arrays. Branched nanowire photoelectrochemical cells were also made and characterized for their spectral incident photon-to-current conversion efficiency. These works have been sponsored by U.S. Department of Energy and National Science Foundation.

32

Handloser, M., R. B. Dunbar, A. Wisnet, P. Altpeter, C. Scheu, L. Schmidt-Mende e A. Hartschuh. "Influence of metallic and dielectric nanowire arrays on the photoluminescence properties of P3HT thin films". Nanotechnology 23, n. 30 (2 luglio 2012): 305402. http://dx.doi.org/10.1088/0957-4484/23/30/305402.

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33

SCHOLZ, PATRICK, STEPHAN SCHWIEGER, PARINDA VASA e ERICH RUNGE. "CALCULATION AND INTERPRETATION OF SURFACE-PLASMON-POLARITON FEATURES IN THE REFLECTIVITY OF METALLIC NANOWIRE ARRAYS". International Journal of Modern Physics B 22, n. 25n26 (20 ottobre 2008): 4442–51. http://dx.doi.org/10.1142/s021797920805019x.

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The far-field reflectivity of metallic nanowire arrays designed to show strong surface-plasmon-polariton (SPP) resonances is studied numerically. The results of calculations in time and frequency space as well as the results of semi-analytic theories using different approximative boundary conditions at the metal surfaces are evaluated and compared. Good agreement between all different methods is obtained in most cases. The SPP-related features are superimposed on a strongly varying background. Combining FDTD simulations, finite element results, and semi-analytical calculations, the microscopic origin of the background contribution is identified. Resonant transmission through sub-wavelength slits leads to pronounced oscillations in the far-field reflectivity as a function of the height of the nanowires.

34

Sharma, Gaurav, Michael V. Pishko e Craig A. Grimes. "Fabrication of metallic nanowire arrays by electrodeposition into nanoporous alumina membranes: effect of barrier layer". Journal of Materials Science 42, n. 13 (19 marzo 2007): 4738–44. http://dx.doi.org/10.1007/s10853-006-0769-1.

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35

Sargioti, Nikoletta, Tanya J. Levingstone, Eoin D. O’Cearbhaill, Helen O. McCarthy e Nicholas J. Dunne. "Metallic Microneedles for Transdermal Drug Delivery: Applications, Fabrication Techniques and the Effect of Geometrical Characteristics". Bioengineering 10, n. 1 (23 dicembre 2022): 24. http://dx.doi.org/10.3390/bioengineering10010024.

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Current procedures for transdermal drug delivery (TDD) have associated limitations including poor administration of nucleic acid, small or large drug molecules, pain and stress for needle phobic people. A painless micro-sized device capable of delivering drugs easily and efficiently, eliminating the disadvantages of traditional systems, has yet to be developed. While polymeric-based microneedle (MN) arrays have been used successfully and clinically as TDD systems, these devices lack mechanical integrity, piercing capacity and the ability to achieve tailored drug release into the systemic circulation. Recent advances in micro/nano fabrication techniques using Additive Manufacturing (AM), also known as 3D printing, have enabled the fabrication of metallic MN arrays, which offer the potential to overcome the limitations of existing systems. This review summarizes the different types of MNs used in TDD and their mode of drug delivery. The application of MNs in the treatment of a range of diseases including diabetes and cancer is discussed. The potential role of solid metallic MNs in TDD, the various techniques used for their fabrication, and the influence of their geometrical characteristics (e.g., shape, size, base diameter, thickness, and tip sharpness) on effective TDD are explored. Finally, the potential and the future directions relating to the optimization of metallic MN arrays for TDD are highlighted.

36

Chen, Pengzuo, Tianpei Zhou, Minglong Chen, Yun Tong, Nan Zhang, Xu Peng, Wangsheng Chu, Xiaojun Wu, Changzheng Wu e Yi Xie. "Enhanced Catalytic Activity in Nitrogen-Anion Modified Metallic Cobalt Disulfide Porous Nanowire Arrays for Hydrogen Evolution". ACS Catalysis 7, n. 11 (29 settembre 2017): 7405–11. http://dx.doi.org/10.1021/acscatal.7b02218.

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37

Garcia, N., E. V. Ponizowskaya, Hao Zhu, John Q. Xiao e A. Pons. "Wide photonic band gaps at the visible in metallic nanowire arrays embedded in a dielectric matrix". Applied Physics Letters 82, n. 19 (12 maggio 2003): 3147–49. http://dx.doi.org/10.1063/1.1569656.

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38

Chen, Pengzuo, Kun Xu, Zhiwei Fang, Yun Tong, Junchi Wu, Xiuli Lu, Xu Peng, Hui Ding, Changzheng Wu e Yi Xie. "Metallic Co4N Porous Nanowire Arrays Activated by Surface Oxidation as Electrocatalysts for the Oxygen Evolution Reaction". Angewandte Chemie International Edition 54, n. 49 (6 ottobre 2015): 14710–14. http://dx.doi.org/10.1002/anie.201506480.

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39

Chen, Pengzuo, Kun Xu, Zhiwei Fang, Yun Tong, Junchi Wu, Xiuli Lu, Xu Peng, Hui Ding, Changzheng Wu e Yi Xie. "Metallic Co4N Porous Nanowire Arrays Activated by Surface Oxidation as Electrocatalysts for the Oxygen Evolution Reaction". Angewandte Chemie 127, n. 49 (6 ottobre 2015): 14923–27. http://dx.doi.org/10.1002/ange.201506480.

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40

Choi, Soon Mee, Jiung Cho, Young Keun Kim e Cheol Jin Kim. "TEM Analysis of Multilayered Co/Cu Nanowire Synthesized by DC Electrodeposition". Solid State Phenomena 124-126 (giugno 2007): 1233–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1233.

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Abstract (sommario):

As-received multilayered Co/Cu nanowire arrays were examined by TEM, which were synthesized by pulsed DC electrodeposition using anodized aluminum oxide (AAO) templates. The multilayered Co/Cu nanowire exhibited magnetism in the perpendicular direction to the long wire axis. These nanowire can be applied to sensor array, magnetic bead(biocompatible), MRI contrast enhancing agent, ferro-fluid. Although the characterization of the multilayered Co/Cu nanowire using XRD and VSM and microstructural analysis using TEM on the bare nanowires extracted from AAO templates have been reported, interface analysis between Co and Cu phase or HREM analysis has not been reported in detail. We have prepared TEM specimen with large thin area which was appropriate for the interface analysis between Co and Cu layer without removing AAO templates using tripod polishing method. Tripod polishing proved very efficient to secure the large observable area during TEM session since the polishing angle can be precisely controlled, regardless of the mechanical strength differences in constituents. Thus we could observe not only the interface between Co and Cu layer but also the interface between the metallic layers and AAO templates. Microstructure, composition, and the concentration variation of each Co and Cu layer and the interfaces were analyzed with TEM and STEM.

41

Marchal, Nicolas, Tristan da Câmara Santa Clara Gomes, Flavio Abreu Araujo e Luc Piraux. "Giant Magnetoresistance and Magneto-Thermopower in 3D Interconnected NixFe1−x/Cu Multilayered Nanowire Networks". Nanomaterials 11, n. 5 (27 aprile 2021): 1133. http://dx.doi.org/10.3390/nano11051133.

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The versatility of the template-assisted electrodeposition technique to fabricate complex three-dimensional networks made of interconnected nanowires allows one to easily stack ferromagnetic and non-magnetic metallic layers along the nanowire axis. This leads to the fabrication of unique multilayered nanowire network films showing giant magnetoresistance effect in the current-perpendicular-to-plane configuration that can be reliably measured along the macroscopic in-plane direction of the films. Moreover, the system also enables reliable measurements of the analogous magneto-thermoelectric properties of the multilayered nanowire networks. Here, three-dimensional interconnected NixFe1−x/Cu multilayered nanowire networks (with 0.60≤x≤0.97) are fabricated and characterized, leading to large magnetoresistance and magneto-thermopower ratios up to 17% and −25% in Ni80Fe20/Cu, respectively. A strong contrast is observed between the amplitudes of magnetoresistance and magneto-thermoelectric effects depending on the Ni content of the NiFe alloys. In particular, for the highest Ni concentrations, a strong increase in the magneto-thermoelectric effect is observed, more than a factor of 7 larger than the magnetoresistive effect for Ni97Fe3/Cu multilayers. This sharp increase is mainly due to an increase in the spin-dependent Seebeck coefficient from −7 µV/K for the Ni60Fe40/Cu and Ni70Fe30/Cu nanowire arrays to −21 µV/K for the Ni97Fe3/Cu nanowire array. The enhancement of the magneto-thermoelectric effect for multilayered nanowire networks based on dilute Ni alloys is promising for obtaining a flexible magnetic switch for thermoelectric generation for potential applications in heat management or logic devices using thermal energy.

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Arefpour, M., M. Almasi Kashi, A. Ramazani e A. H. Montazer. "Electrochemical pore filling strategy for controlled growth of magnetic and metallic nanowire arrays with large area uniformity". Nanotechnology 27, n. 27 (1 giugno 2016): 275605. http://dx.doi.org/10.1088/0957-4484/27/27/275605.

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Liu, Xikui, e Manfred Stamm. "Fabrication of Highly Ordered Polymeric Nanodot and Nanowire Arrays Templated by Supramolecular Assembly Block Copolymer Nanoporous Thin Films". Nanoscale Research Letters 4, n. 5 (19 febbraio 2009): 459–64. http://dx.doi.org/10.1007/s11671-009-9263-4.

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Zhou, Renlong, Xiaoshuang Chen, Bingju Zhou, Xiaojuan Liu, Hui Deng, Zhibin Deng, Guozheng Nie, Lingxi Wu e Yongyi Gao. "The negative electromagnetic attractive forces arising from kinetic energy of conduction electrons in double-layer metallic nanowire arrays". Solid State Communications 152, n. 13 (luglio 2012): 1186–90. http://dx.doi.org/10.1016/j.ssc.2012.03.020.

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Zaraska, Leszek, Grzegorz D. Sulka e Marian Jaskuła. "Porous anodic alumina membranes formed by anodization of AA1050 alloy as templates for fabrication of metallic nanowire arrays". Surface and Coatings Technology 205, n. 7 (dicembre 2010): 2432–37. http://dx.doi.org/10.1016/j.surfcoat.2010.09.038.

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Chen, Pengzuo, Kun Xu, Zhiwei Fang, Yun Tong, Junchi Wu, Xiuli Lu, Xu Peng, Hui Ding, Changzheng Wu e Yi Xie. "ChemInform Abstract: Metallic Co4N Porous Nanowire Arrays Activated by Surface Oxidation as Electrocatalysts for the Oxygen Evolution Reaction." ChemInform 47, n. 7 (gennaio 2016): no. http://dx.doi.org/10.1002/chin.201607011.

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Zhao, Zhen, Chaoqun Xia e Jianjun Yang. "Regular Nanowire Formation on Fe-Based Metal Glass by Manipulation of Surface Waves". Nanomaterials 11, n. 9 (14 settembre 2021): 2389. http://dx.doi.org/10.3390/nano11092389.

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Abstract (sommario):

We report the formation of a sole long nanowire structure and the regular nanowire arrays inside a groove on the surface of Fe-based metallic glass upon irradiation of two temporally delayed femtosecond lasers with the identical linear polarization parallel and perpendicular to the groove, respectively. The regular structure formation can be well observed within the delay time of 20 ps for a given total laser fluence of F = 30 mJ/cm2 and within a total laser fluence range of F = 30–42 mJ/cm2 for a given delay time of 5 ps. The structural features, including the unit width and distribution period, are measured on a one-hundred nanometer scale, much less than the incident laser wavelength of 800 nm. The degree of structure regularity sharply contrasts with traditional observations. To comprehensively understand such phenomena, we propose a new physical model by considering the spin angular momentum of surface plasmon and its enhanced inhomogeneous magnetization for the ferromagnetic metal. Therefore, an intensive TE polarized magnetic surface wave is excited to result in the nanometer-scaled energy fringes and the ablative troughs. The theory is further verified by the observation of nanowire structure disappearance at the larger time delays of two laser pulses.

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Liu, Liu, Mingliang Jin, Yaocheng Shi, Jiao Lin, Yuan Zhang, Li Jiang, Guofu Zhou e Sailing He. "Optical integrated chips with micro and nanostructures for refractive index and SERS-based optical label-free sensing". Nanophotonics 4, n. 4 (6 novembre 2015): 419–36. http://dx.doi.org/10.1515/nanoph-2015-0015.

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Abstract:Label-free optical biosensing technologies have superior abilities of quantitative analysis, unmodified targets, and ultrasmall sample volume, compared to conventional fluorescence-label-based sensing techniques, in detecting various biomolecules. In this review article, we introduce our recent results in the field of evanescent-wavebased refractive index sensing and surface enhanced Raman scattering (SERS)-based sensing, both of which are promising platforms for label-free optical biosensors. First, silicon-on-insulator (SOI) nanowire waveguide and metallic surface plasmon resonance (SPR)-based refractive index sensing are discussed. In order to improve the detection limit, phase interrogation techniques are introduced to these types of sensors based on prism-coupled SPR and SOI microring resonators. A detection limit in the order of 10−6 refractive index unit is achieved. Detection of 16.7 pM anti-IgG is also demonstrated based on the SPR devices. Second, SERS substrates based on various nanometallic structures are discussed. Metallic nanowire arrays and inverted nanopyramids and grooves with a thin metal surface are fabricated based on anisotropic wetetching of silicon substrates. Both structures have demonstrated a Raman signal enhancement on the order of 107. In order to improve the extraction efficiency of the Raman signal at a high wave number, a nano-bowtie array substrate is fabricated, which exhibits double resonances at both the excitation wavelength and the desired Raman scattering wavelength. Experimental results have shown that this double-resonance structure can further enhance the received Raman signal, as compared to conventional SERS substrates with only one resonance at the excitation wavelength.

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Fedorenko, Anastasiia, Mohadeseh A. Baboli, Parsian K. Mohseni e Seth M. Hubbard. "Design and Simulation of the Bifacial III-V-Nanowire-on-Si Solar Cell". MRS Advances 4, n. 16 (2019): 929–36. http://dx.doi.org/10.1557/adv.2019.127.

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ABSTRACTRigorous coupled wave analysis (RCWA) simulation was used to model the absorption in periodic arrays of GaAs0.73P0.27 nanowires (NWs) on Si substrates dependent upon the diameter (D), length (L), and spacing (center-to-center distance, or pitch, P) of the NWs. Based on this study, two resonant arrangements for a top NW array sub-cell having the highest limiting short-circuit current densities (Jsc) were found to be close to D = 150 nm, P = 250 nm and D = 300 nm, P = 500 nm, both featuring the same packing density of 0.28. Even though a configuration with thinner NWs exhibited the highest Jsc = 19.46 mA/cm2, the array with D = 350 nm and P = 500 nm provided current matching with the underlying Si sub-cell with Jsc = 18.59 mA/cm2. Addition of a rear-side In0.81Ga0.19As nanowire array with D = 800 nm and P = 1000 nm was found to be suitable for current matching with the front NW sub-cell and middle Si. However, with thinner and sparser In0.81Ga0.19As NWs with D = 700 nm and P = 1000 nm, the Jsc of the bottom sub-cell was increased from 17.35 mA/cm2 to 18.76 mA/cm2 using a planar metallic back surface reflector, thus achieving a current matching with the top and middle cells.

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KHOMUTOV, G. B., M. N. ANTIPINA, A. N. SERGEEV-CHERENKOV, A. A. RAKHNYANSKAYA, M. ARTEMYEV, D. KISIEL, R. V. GAINUTDINOV, A. L. TOLSTIKHINA e V. V. KISLOV. "ORGANIZED PLANAR NANOSTRUCTURES VIA INTERFACIAL SELF-ASSEMBLY AND DNA TEMPLATING". International Journal of Nanoscience 03, n. 01n02 (febbraio 2004): 65–74. http://dx.doi.org/10.1142/s0219581x04001821.

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Abstract (sommario):

The methods are presented for fabrication of new nanoscale-organized planar inorganic nanostructures, ultrathin polymeric and nanocomposite films on solid substrates with incorporated nanosized functional and structural building blocks. The methods are based on interfacial synthesis and self-assembly, DNA templating and scaffolding. Ultimately thin monomolecular and multilayer ordered stable polymeric and nanocomposite films containing incorporated ligand-stabilized gold nanoclusters, interfacially in-film grown metallic ( Au , Pd ) nanoparticles and organized low-dimensional nanostructures were formed. N-alkylated derivatives of poly(4-vinilpyridine) were synthesized and used as water-insoluble amphiphilic polycations to form organized polymeric Langmuir monolayers and novel planar DNA/amphiphilic polycation complexes at the air–aqueous DNA solution interface. The extended net-like and quasi-circular toroidal condensed conformations of deposited planar DNA/amphiphilic polycation complexes were obtained in dependence on the amphiphilic polycation monolayer state during the DNA binding. Planar DNA/amphiphilic polycation complexes were used as nanotemplates for fabrication of organized planar bio-organic–inorganic hybrid nanostructures with ordered nanophase inorganic components (quasi-one-dimensional arrays of semiconductor (CdS) and iron oxide nanoparticles and nanorods) organized in planar matrix of deposited DNA/amphiphilic polycation complex film. The formed nanostructures were characterized by atomic force microscopy and transmission electron microscopy techniques.