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Journal articles on the topic 'ZnO nanocrystal'

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Author: Grafiati

Published: 14 March 2023

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1

Della Gaspera, Enrico, Noel W. Duffy, Joel van Embden, Lynne Waddington, Laure Bourgeois, Jacek J. Jasieniak, and Anthony S. R. Chesman. "Plasmonic Ge-doped ZnO nanocrystals." Chemical Communications 51, no. 62 (2015): 12369–72. http://dx.doi.org/10.1039/c5cc02429c.

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2

Long, Mei, Huan Yuan, Ping Sun, Lei Su, and Xiangping Jiang. "UV-Assisted Room Temperature Gas Sensing with ZnO-Ag Heterostructure Nanocrystals Studied by Photoluminescence." Journal of Nanoscience and Nanotechnology 21, no. 9 (September 1, 2021): 4865–69. http://dx.doi.org/10.1166/jnn.2021.19121.

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Noble metal-metal oxide nanohybrids play a significant contribution in gas sensing applications at room temperature. Here, Ag-loaded ZnO with different Ag doping concentration are prepared by two-step polymer-network gel method, and NO2 sensing characteristics are tested at room temperature with various concentrations. The nanocrystal sizes are found to be more uniform with increasing with Ag concentration, and photoluminescence spectroscopy further reveals the different defects in ZnO–Ag nanocrystal lattices: pure ZnO has the largest intensity of the conduction band to valence band combination, and ZnO–Ag-1 (1 mol% Ag doping concentration) has the largest oxygen vacancy content, while ZnO–Ag-3 (3 mol% Ag doping concentration) has the largest excess zinc interstitial. It is showed that the gas sensing properties are independent of the size of nanocrystals, and more dependent on the nanocrystal defect structure. In this work, a new sensing mechanism is proposed according to the experimental results.

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3

LI, JUN, KUI ZHAO, RUOKUN JIA, YANMEI LIU, YUBAI BAI, and TIEJIN LI. "USING EMISSION QUENCHING TO STUDY THE INTERACTION BETWEEN ZnO NANOCRYSTALS AND ORGANIC LIGANDS." International Journal of Nanoscience 01, no. 05n06 (October 2002): 743–47. http://dx.doi.org/10.1142/s0219581x02000991.

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Colloidal ZnO nanocrystals with strong green luminescence were prepared. When ZnO nanocrystals were modified with different organic ligands, the emission quenching was measured and used to study the interaction between ZnO nanocrystal and organic ligands. Efficiency of emission quenching relates to the chemical structures of the ligands, and metal-thiolate bond was formed between nanocrystals and thiol ligands. The relative strength of the binding and the surface concentration of the adsorbed species could be determined using this method.

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4

Okazaki, K., T. Shimogaki, M. Higashihata, D. Nakamura, and T. Okada. "Synthesis and Nano-Processing of ZnO Nano-Crystals for Controlled Laser Action." MRS Proceedings 1439 (2012): 121–26. http://dx.doi.org/10.1557/opl.2012.1155.

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ABSTRACTLasing characteristics of a single Zinc oxide (ZnO) nanosheet and a single ZnO nanowire were investigated by an ultraviolet light excitation. ZnO nanocrystals were synthesized by chemical vapor deposition (CVD) method, and those ZnO nanocrystals were excited by a third-harmonic Q-switched Nd:YAG laser beam (355 nm, 5 ns). The emission spectra from a single ZnO nanocrystal was collected by an objective lens with a magnification factor of 100 or 50, coupled with a spectrometer with a light fiber. The area observed by the spectrometer is about 10 μm in diameter, and therefore the emission spectra from a single ZnO nanocrystal can be observed. The emission spectra showed the obvious lasing characteristics having mode structure and a threshold for lasing. The lasing threshold power density of a ZnO nanosheet and a ZnO nanowire were measured to be about 60 kW/cm2 and 150 kW/cm2, respectively. ZnO nanosheet can be a superior laser medium due to the lower threshold for lasing compared to the threshold of the ZnO nanowire. However, since the lasing spectra had mode structure, a single-longitudinal mode lasing would be required for a practical application. The single longitudinal mode lasing can be realized by a nanomachining of a grating on the ZnO nanocrystal surface due to distributed bragg reflector (DBR) laser. The minimum DBR pitch was estimated to be about 81 nm, which can be machined by focused-ion beam (FIB) focused up to 7 nm at minimum, and therefore, we demonstrated the nanomachining on a single ZnO nanowire. However, the single-longitudinal mode lasing was not observed so far, and thus optimization of experimental conditions such as the DBR pitch, ion dose amount and increasing the number of repetition of DBR would be required.

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5

ABDULSATTAR, MUDAR AHMED, and HASAN MUDAR ALMAROOF. "ADSORPTION OF H2 AND O2 GASES ON ZnO WURTZOID NANOCRYSTALS: A DFT STUDY." Surface Review and Letters 24, Supp01 (October 31, 2017): 1850008. http://dx.doi.org/10.1142/s0218625x18500087.

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In the present work, we apply wurtzoids nanocrystals with density functional theory to explain the sensitivity of ZnO nanostructures towards hydrogen and oxygen molecules. Present results of ZnO nanocrystals’ sensing to H2 and O2 molecules show a reduction in the energy gap and hence electrical resistivity of ZnO nanocrystals upon attachments of these molecules in agreement with experiment. The results also show that higher temperatures increase the sensitivity of ZnO wurtzoids towards H2 and O2 molecules with the maximum sensitivity approximately at 390[Formula: see text]C and 417[Formula: see text]C for H2 and O2 molecules, respectively, after which it begins to decline according to calculated Gibbs free energy. These temperatures are comparable with experimentally reported operating temperatures of 325[Formula: see text]C and 350[Formula: see text]C for the two gases, respectively. The main reaction mechanism is the dissociation of H2 or O2 molecules on ZnO nanocrystal surface in which hydrogen and oxygen atoms are attached to neighboring Zn and O surface atoms. The removal of these molecules from the surface is also performed by the formation of H2 and O2 molecules prior to their removal from the ZnO nanocrystal surface. Electronic charge transfers to the adsorbed atoms and molecules confirm and illustrate the mechanism mentioned above.

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6

Zhou, Dongming, and Kevin R. Kittilstved. "Control over Fe3+ speciation in colloidal ZnO nanocrystals." Journal of Materials Chemistry C 3, no. 17 (2015): 4352–58. http://dx.doi.org/10.1039/c5tc00470e.

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The ground state electronic structure of Fe³⁺ dopants in colloidal ZnO nanocrystals is studied by EPR spectroscopy and reveals multiple Fe³⁺ coordination environments during nanocrystal growth.

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7

Chen, Yi Chuan, Yue Hui Hu, Xiao Hua Zhang, Feng Yang, Hai Jun Xu, Xin Hua Chen, and Jun Chen. "Structure and Properties of Doped ZnO Nanopowders Synthesized by Methanol Alcoholysis Method." Advanced Materials Research 287-290 (July 2011): 1406–11. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1406.

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Pured ZnO, Al doped ZnO and Al-In co-doped ZnO nanopowders were synthesized by the methanol alcoholysis method at 130 °C. Structure, morphology and optical properties of ZnO nanopowders were characterized using X-ray diffraction, Transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and Photoluminescence (PL) spectra. The results show that ZnO nanopowders can be obtained in methanol solution at low temperature (130 °C). TEM images show that Al doped ZnO nanocrystals grow along the [002] axis quicker than other axes. FTIR spectra show that ZnO nanocrystals synthesized by the methanol alcoholysis include a little organic impurity. PL spectrums reveal that pure ZnO and doped ZnO nanocrystals have a blue band emission at 440 nm and a green band emission at 520 nm and 530 nm, respectively. Compared with the pure ZnO nanocrystal, the Al doping improves the luminescent properties.

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8

SRIVASTAVA, ANURAG, and NEHA TYAGI. "PRESSURE INDUCED PHASE TRANSITION AND ELECTRONIC PROPERTIES OF 1D ZnO NANOCRYSTAL: AN AB INITIO STUDY." International Journal of Nanoscience 11, no. 05 (October 2012): 1250035. http://dx.doi.org/10.1142/s0219581x12500354.

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We have analyzed the one-dimensional (1D) ZnO nanocrystals in its wurtzite (B4); zinc-blende (B3) and rocksalt (B1) type phases, by means of density functional theory (DFT) calculations. The energetic stability of nanocrystal has been analyzed using Revised Perdew–Burke–Ernzerhof (revPBE) type parameterized GGA potential. The B3 type phase is most stable amongst other phases of nanocrystals. The computation of ground state properties for all the phases of ZnO nanocrystals finds that the bulk modulus are smaller than their bulk counterpart, in turn softening the material at reduced dimensions. The electronic band structure analysis confirms the semiconducting nature of B4 type phase whereas other two are metallic.

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9

Champouret, Yohan, Grégory Spataro, Yannick Coppel, Fabienne Gauffre, and Myrtil L. Kahn. "Nanocrystal–ligand interactions deciphered: the influence of HSAB and pKa in the case of luminescent ZnO." Nanoscale Advances 2, no. 3 (2020): 1046–53. http://dx.doi.org/10.1039/c9na00769e.

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The pK_a values of an organic substrate determines its interaction with the nanocrystal's surface while its hard or soft character will govern the emission intensity of the ZnO nanocrystals.

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10

Bai, Rekha, Dinesh K. Pandya, Sujeet Chaudhary, Veer Dhaka, Vladislav Khayrudinov, Jori Lemettinen, Christoffer Kauppinen, and Harri Lipsanen. "Site-specific growth of oriented ZnO nanocrystal arrays." Beilstein Journal of Nanotechnology 10 (January 24, 2019): 274–80. http://dx.doi.org/10.3762/bjnano.10.26.

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We report on the growth of ZnO nanocrystals having a hexagonal, prismatic shape, sized 700 nm × 600 nm, on bare indium tin oxide (ITO) substrates. The growth is induced by a low ion flux and involves a low-temperature electrodeposition technique. Further, vertically aligned periodic nanocrystal (NC) growth is engineered at predefined positions on polymer-coated ITO substrates patterned with ordered pores. The vertical alignment of ZnO NCs along the c-axis is achieved via ion-by-ion nucleation-controlled growth for patterned pores of size ≈600 nm; however, many-coupled branched NCs with hexagonal shape are formed when a patterned pore size of ≈200 nm is used. X-ray diffraction data is in agreement with the observed morphology. A mechanism is proposed to interpret the observed site-specific oriented/branched growth that is correlated to the pore size. As ordered NC arrays have the potential to generate new collective properties different from single NCs, our first demonstration of a cost effective and facile fabrication process opens up new possibilities for devices with versatile functionalities.

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11

Valle, Anderson L., Anielle C. A. Silva, Noelio O. Dantas, Robinson Sabino-Silva, Francielli C. C. Melo, Cleumar S. Moreira, Guedmiller S. Oliveira, Luciano P. Rodrigues, and Luiz R. Goulart. "Application of ZnO Nanocrystals as a Surface-Enhancer FTIR for Glyphosate Detection." Nanomaterials 11, no. 2 (February 17, 2021): 509. http://dx.doi.org/10.3390/nano11020509.

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Glyphosate detection and quantification is still a challenge. After an extensive review of the literature, we observed that Fourier transform infrared spectroscopy (FTIR) had practically not yet been used for detection or quantification. The interaction between zinc oxide (ZnO), silver oxide (Ag2O), and Ag-doped ZnO nanocrystals (NCs), as well as that between nanocomposite (Ag-doped ZnO/AgO) and glyphosate was analyzed with FTIR to determine whether nanomaterials could be used as signal enhancers for glyphosates. The results were further supported with the use of atomic force microscopy (AFM) imaging. The glyphosate commercial solutions were intensified 10,000 times when incorporated the ZnO NCs. However, strong chemical interactions between Ag and glyphosate may suppress signaling, making FTIR identification difficult. In short, we have shown for the first time that ZnO NCs are exciting tools with the potential to be used as signal amplifiers of glyphosate, the use of which may be explored in terms of the detection of other molecules based on nanocrystal affinity.

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12

Scheunemann, Dorothea, Sebastian Wilken, Jürgen Parisi, and Holger Borchert. "Charge carrier loss mechanisms in CuInS2/ZnO nanocrystal solar cells." Physical Chemistry Chemical Physics 18, no. 24 (2016): 16258–65. http://dx.doi.org/10.1039/c6cp01015f.

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The charge carrier loss mechanisms in solution-processed CuInS₂/ZnO nanocrystal solar cells are studied using steady-state and transient techniques. The results represent a step forward in understanding the device physics of copper-based nanocrystal photovoltaics.

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13

CHEN, HAO-LONG, and KO-CHENG TSENG. "OBSERVATION OF NANOSCALED ZnO GROWTH ON POLYCRYSTALLINE Zn METAL SHEET PREPARED BY ATMOSPHERIC-PRESSURE PLASMA JET." International Journal of Nanoscience 09, no. 04 (August 2010): 335–39. http://dx.doi.org/10.1142/s0219581x10006910.

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Nanoscaled zinc oxides were grown on a polycrystalline Zn metal sheet by using an atmospheric-pressure plasma jet (APPJ) with pure oxygen as the reaction gas in an ambient environment. The initial growth formed nanoparticles on the polycrystalline Zn substrate. The nanoscaled ZnO growth process was as follows: nanoparticles, nanocrystal clusters, and then nanocrystal columns with increasing plasma treatment times. The morphologies of nanoscaled ZnO resembled bulbs, long-legged tetrapods, and multipods. The morphologies and structures of the nanoscaled ZnO thus obtained were investigated by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and grazing-incidence X-ray diffraction (GIXRD). The possible growth mechanisms of nanoscaled ZnO are discussed in this paper.

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14

Satienpattanakoon, C., D. Yiamsawas, Wiyong Kangwansupamonkon, and R. Nuisin. "Synthesis and Characterization of Zinc Oxide Nanocrystals by Solid-State and Solvothermal Techniques." Advanced Materials Research 55-57 (August 2008): 657–60. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.657.

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The nanostructural zinc oxide (ZnO) particles have been synthesized by two techniques, solid-state reaction and solvothermal method. The solid-state reaction method, the ZnO nanoparticles were carried out by reacting zinc acetate with sodium hydroxide in sodium dodecyl sulfate (SDS) and beta-cyclodextrin (b-CD). The effects of reaction condition on the nanocrystal morphology were investigated. The physical properties of ZnO were characterized using X-ray diffraction technique and transmission electron microscopy. The results showed that the obtained ZnO nanorods were in the wurtzite structure with various sizes of single crystals. FT-IR analysis also confirmed the binding of SDS with ZnO nanorods. For the solvothermal technique, ZnO nanostructures with various morphologies were synthesized from the treatment of zinc acetate at 80°C with the selected polymeric surfactant, poly(vinyl pyrrolidone) (PVP), in aqueous solution and ethylene glycol. The results showed that the selected surfactant and solvent play a different role in controlling the morphologies of the ZnO nanocrystals. The ZnO nanorods and nanoparticles were successfully obtained. The XRD result revealed that the ZnO is in the wurtzite structure with the particle size in range of 270-1300 nm. The optical properties of the samples were also studied via UV-vis spectrophotometer.

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15

Aljaafari, Abdullah, and Ahmed Sedky. "Influence of Fine Crystal Percentage on the Electrical Properties of ZnO Ceramic-Based Varistors." Crystals 10, no. 8 (August 6, 2020): 681. http://dx.doi.org/10.3390/cryst10080681.

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Herein, the effect of nanocrystal percentage in bulk-ZnO varistors was studied. The structure of ZnO nanocrystals was examined using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). The XRD studies showed that the nanocrystals were indexed with the hexagonal wurtzite structure of ZnO nanostructures. The average crystallite size deduced from XRD analysis ranged between 135 and 273 nm, eight-fold lower than that of the nanoparticles observed in FE-SEM micrographs (1151–2214 nm). The percentage of nanocrystals added into the ZnO varistor was increased from 0 to 100%. Electrical measurements (I–V profiles) showed that the non-linear region, breakdown field, and activation energy were found to decrease with the addition of ZnO fine crystals up to 10% and then increased upon a further increase in fine crystals. However, the electrical conductivity measured at room temperature was improved, and the highest value of 2.11 × 10−5 was observed for 10% fine crystals and then decreased upon a further increase in the fine crystal concentration in bulk ZnO. The breakdown field decreased with the increase in the percentage of ZnO nanostructures in the varistor up to 10% and then increased upon the further addition of ZnO nanostructures. The nonlinear coefficient (α) was decreased from 18.6 for bulk ZnO and remained close to unity for the samples that contained fine crystals. The electrical conductivity was generally improved with the increase in the concentration of the ZnO fine crystals. The activation energy was found to be 128, 374, and 815 meV for the bulk samples and 164, 369, and 811 meV for the samples that contained 100% fine crystals for the three temperature regions of 300–420, 420–580, and 580–620 K, respectively. These results will provide a pathway toward the determination of a correlation between the electrical and microstructural properties of ZnO-based varistors for future device applications.

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16

Yu, W. D., X. M. Li, and X. D. Gao. "Synthesis and structural characteristics of high-quality tetrapodlike ZnO nanocrystals on ZnO and NiO nanocrystal substrates." Journal of Crystal Growth 270, no. 1-2 (September 2004): 92–97. http://dx.doi.org/10.1016/j.jcrysgro.2004.05.102.

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17

Babak, Jaleh, Ashrafi Ghazaleh, Gholami Nasim, Azizian Saeid, Golbedaghi Reza, Habibi Safdar, and Parsian Hosein. "Study of Heating Effect on Specific Surface Area, and Changing Optical Properties of ZnO Nanocrystals." Advanced Materials Research 403-408 (November 2011): 1205–10. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.1205.

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In this work ZnO nanocrystal powders have been synthesized by using Zinc acetate dehydrate as a precursor and sol-gel method. Then the products have been annealed at temperature of 200-1050°C, for 2 hours. The powders were characterized using X-ray diffraction (XRD), UV-vis absorption and photoluminescence (PL) spectroscopy. The morphology of refrence ZnO nanoparticles have been studied using Transmission Electron Microscope (TEM). During the annealing process, increase in nanocrystal size, defects and energy gap quantitative, and decrease in specific surface area have been observed.

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18

Farha, Ashraf H., Mervat M. Ibrahim, and Shehab A. Mansour. "Ga-Doped ZnO Nanostructured Powder for Cool-Nanopigment in Environment Applications." Materials 13, no. 22 (November 16, 2020): 5152. http://dx.doi.org/10.3390/ma13225152.

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Gallium (Ga) doped zinc oxide (ZnO) nanocrystals were successfully synthesized via a γ-radiation-assisted polymer-pyrolysis route. Ga doped ZnO samples with Ga and ZnO precursor salts with molar ratios of 0%, 3%, 5%, and 10% were produced. A γ-radiation dosage of 1.5 kGy was used for polymerization initiation during the sample preparation. The properties of the obtained nanocrystal samples were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR), UV-visible absorption, NIR-VIS-UV diffused reflectance, and high-resolution transmission electron microscopy (HR-TEM) characterization techniques. XRD results revealed the formation of ZnO nanocrystals with wurtzite structure for both Ga-doped and undoped ZnO samples. Noticeable increasing in the line broadening of the XRD peaks as well as pronounced decreasing of crystallite size were observed with the increasing Ga ratio in the samples. Optical peaks around Ga:ZnO samples showed a blueshift in the optical absorption peaks with increasing Ga content. These results are in good agreement with the dependency of crystallites size as well as grain size on Ga ratio obtained from XRD and TEM images, which make them fit well for the powder cool-pigment applications. The doped samples showed high values of NIR reflectance (RNIR*) with percentage varied from 84.25% to 89.05% that enabled them to qualify for cool-nanopigment applications. Furthermore, such doped samples registered low values of visible reflectance (RVIS*) that enabled to reduce the glare from the reflected visible sunlight.

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19

Vu, An Nang, Anh Mai Tran, Nghi Tuyet Nguyen, Duyen My Ngoc Lam, Phong Pham Nam Le, Nhan Thuc Chi Ha, and Hieu Van Le. "Green one-step synthesis of cellulose nanocrystal/ ZnO nanohybrid with high photocatalytic activity." Science and Technology Development Journal - Natural Sciences 5, no. 3 (May 29, 2021): first. http://dx.doi.org/10.32508/stdjns.v5i3.924.

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In this work, nanohybrid of zinc oxide/ cellulose nanocrystals (ZnO/CNC) was successfully prepared by using a low cost and green method for photocatalytic degradation of methylene blue (MB). CNC had been derived through the hydrolysis reaction by citric/hydrochloric acid from the pure cellulose isolated from Vietnamese Nypa fruticans trunk. The obtained CNC with carboxyl groups could act as a stabilizing and supporting agent to anchor ZnO nanoparticles. The chemical and crystal structures, morphology, thermal and photocatalytic properties of the ZnO/CNC nanohybrid were characterized by FESEM, FTIR, XRD, FESEM, BET, EDX, TGA, DRS and photocatalytic tests. Analyses of FTIR spectra, XRD, and FESEM indicated that the ZnO nanocrystals with the size of 50 nm formed and loaded on the surface of CNC. The TGA analysis demonstrated that the ZnO loading sample (ZnO/CNC) had the thermal degradation onset temperature higher than that of neat CNC. ZnO/CNC cuold be absorpted ultraviolet light and have high value of specific surface area (SBET), based on the DRS spectra and the nitrogen adsorption – desorption isotherms analysis, respectively. ZnO/CNC displayed more photocatalytic activity than pure ZnO upon degradation of methylene blue due to strong interaction between the CNC and ZnO nanoparticles. The maximum degradation of MB was about 95% in 150 minutes for the ZnO/CNC.

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20

Feng, Wei, Yaming Wang, Junchen Chen, Lixin Guo, Jiahu Ouyang, Dechang Jia, and Yu Zhou. "Microwave absorbing property optimization of starlike ZnO/reduced graphene oxide doped by ZnO nanocrystal composites." Physical Chemistry Chemical Physics 19, no. 22 (2017): 14596–605. http://dx.doi.org/10.1039/c7cp02039b.

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21

Ammar, H. Y., H. M. Badran, Ahmad Umar, H. Fouad, and Othman Y. Alothman. "ZnO Nanocrystal-Based Chloroform Detection: Density Functional Theory (DFT) Study." Coatings 9, no. 11 (November 19, 2019): 769. http://dx.doi.org/10.3390/coatings9110769.

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We investigated the detection of chloroform (CHCl3) using ZnO nanoclusters via density functional theory calculations. The effects of various concentrations of CHCl3, as well as the deposition of O atoms, on the adsorption over ZnO nanoclusters were analyzed via geometric optimizations. The calculated difference between the highest occupied molecular orbital and the lowest unoccupied molecular orbital for ZnO was 4.02 eV. The most stable adsorption characteristics were investigated with respect to the adsorption energy, frontier orbitals, elemental positions, and charge transfer. The results revealed that ZnO nanoclusters with a specific geometry and composition are promising candidates for chloroform-sensing applications.

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22

Yan, Junfeng, Paul D. McNaughter, Ziji Wang, Nigel Hodson, Mu Chen, Zhengxing Cui, Paul O'Brien, and Brian R. Saunders. "Controlled aggregation of quantum dot dispersions by added amine bilinkers and effects on hybrid polymer film properties." RSC Advances 5, no. 116 (2015): 95512–22. http://dx.doi.org/10.1039/c5ra15009d.

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23

Chai, Zhimin, Xinchun Lu, and Dannong He. "Friction mechanism of zinc oxide films prepared by atomic layer deposition." RSC Advances 5, no. 68 (2015): 55411–18. http://dx.doi.org/10.1039/c5ra05355b.

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Yan, Junfeng, Qing Lian, Muhamad Z. Mokhtar, Amir H. Milani, Eric Whittaker, Bruce Hamilton, Paul O’Brien, Nam T. Nguyen, and Brian R. Saunders. "Textured ZnO films from evaporation-triggered aggregation of nanocrystal dispersions and their use in solar cells." Phys. Chem. Chem. Phys. 19, no. 39 (2017): 27081–89. http://dx.doi.org/10.1039/c7cp05026g.

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Li, Ning, Hongzhe Wang, Qingli Lin, Huaibin Shen, Aqiang Wang, Lei Qian, Fang Guo, and Lin Song Li. "Size-dependent surface photovoltage in CdSe nanocrystal-based thin films." RSC Advances 5, no. 50 (2015): 39714–18. http://dx.doi.org/10.1039/c5ra02007g.

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26

Newton, Marcus C., Steven Firth, and Paul A. Warburton. "Photoresponse of ZnO Tetrapod Nanocrystal Schottky Diodes." IEEE Transactions on Nanotechnology 7, no. 1 (January 2008): 20–23. http://dx.doi.org/10.1109/tnano.2007.915207.

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27

Hue, Ryan J., Rajan Vatassery, Kent R. Mann, and Wayne L. Gladfelter. "Zinc oxide nanocrystal quenching of emission from electron-rich ruthenium-bipyridine complexes." Dalton Transactions 44, no. 10 (2015): 4630–39. http://dx.doi.org/10.1039/c4dt03272a.

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Heteroleptic tris(bipyridine)ruthenium complexes bearing one dicarboxybipyridine ligand bind to dispersed ZnO nanocrystals. Electron releasing amino substituents on the remaining bipyridines raise the excited state potential high enough to allow excited state electron transfer into the ZnO.

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Toufani, Maryam, Sibel Kasap, Ali Tufani, Feray Bakan, Stefan Weber, and Emre Erdem. "Synergy of nano-ZnO and 3D-graphene foam electrodes for asymmetric supercapacitor devices." Nanoscale 12, no. 24 (2020): 12790–800. http://dx.doi.org/10.1039/d0nr02028a.

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29

Ingrosso, C., A. Petrella, M. L. Curri, M. Striccoli, P. Cosma, P. D. Cozzoli, and A. Agostiano. "Photoelectrochemical properties of Zn(II) phthalocyanine/ZnO nanocrystals heterojunctions: nanocrystal surface chemistry effect." Applied Surface Science 246, no. 4 (June 2005): 367–71. http://dx.doi.org/10.1016/j.apsusc.2004.11.041.

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30

Neshchimenko, Vitaly, Chundong Li, Mikhail Mikhailov, and Jinpeng Lv. "Optical radiation stability of ZnO hollow particles." Nanoscale 10, no. 47 (2018): 22335–47. http://dx.doi.org/10.1039/c8nr04455d.

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The research is focused on the effect of irradiation by protons and electrons on the optical properties’ stability of zinc oxide hollow particles as compared with ball, star and flower shaped particles, as well as micro- and nanocrystal powders.

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Paramo, J. Antonio, Yuri M. Strzhemechny, Tamio Endo, and Zorica Crnjak Orel. "Correlation of Defect-Related Optoelectronic Properties inZn5(OH)6(CO3)2/ZnO Nanostructures with Their Quasi-Fractal Dimensionality." Journal of Nanomaterials 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/237985.

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Hydrozincite (Zn5(OH)6(CO3)2) is, among others, a popular precursor used to synthesize nanoscale ZnO with complex morphologies. For many existing and potential applications utilizing nanostructures, performance is determined by the surface and subsurface properties. Current understanding of the relationship between the morphology and the defect properties of nanocrystalline ZnO and hydrozincite systems is still incomplete. Specifically, for the latter nanomaterial the structure-property correlations are largely unreported in the literature despite the extensive use of hydrozincite in the synthesis applications. In our work, we addressed this issue by studying precipitated nanostructures of Zn5(OH)6(CO3)2with varying quasi-fractal dimensionalities containing relatively small amounts of a ZnO phase. Crystal morphology of the samples was accurately controlled by the growth time. We observed a strong correlation between the morphology of the samples and their optoelectronic properties. Our results indicate that a substantial increase of the free surface in the nanocrystal samples generates higher relative concentration of defects, consistent with the model of defect-rich surface and subsurface layers.

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Lian, Qing, Mu Chen, Muhamad Z. Mokhtar, Shanglin Wu, Mingning Zhu, Eric Whittaker, Paul O’Brien, and Brian R. Saunders. "Surface structure, optoelectronic properties and charge transport in ZnO nanocrystal/MDMO-PPV multilayer films." Physical Chemistry Chemical Physics 20, no. 17 (2018): 12260–71. http://dx.doi.org/10.1039/c8cp01148f.

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ZnO nanocrystal/MDMO-PPV multilayer films were studied that contained six bilayers and showed excellent light absorption tuneability, photoluminescence quenching and solar cells exhibited a surprisingly high open circuit voltage.

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33

Sun, Yuhang, Preston D. Donaldson, Javier Garcia-Barriocanal, and Sarah L. Swisher. "Understanding quantum confinement and ligand removal in solution-based ZnO thin films from highly stable nanocrystal ink." Journal of Materials Chemistry C 6, no. 34 (2018): 9181–90. http://dx.doi.org/10.1039/c8tc01536h.

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34

Panprom, P., S. Porntheeraphat, Win Bunjongpru, T. Tiwawong, W. Yamwong, C. Hruanun, Amporn Poyai, and J. Nukeaw. "Nanocrystal-ZnO Thin Film Deposition by a Novel Reactive Gas-Timing RF Magnetron Sputtering Provided for UV Photodetectors." Advanced Materials Research 93-94 (January 2010): 537–40. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.537.

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The fabrication and characterizations of nanocrystal-ZnO thin film used as active layer of MSM-photodetector structure are reported. The ZnO thin film were successfully sputtered on SiO2/Si substrates without heating or annealing processes by using a novel reactive gas-timing technique. In our experiment, the ZnO thin film properties with different gas-timing ratio of Ar/O2 were investigated. For fabricating of UV detector, the Al interdigitate electrode was deposited on SiO2/Si substrate by DC sputtering process and ZnO thin film was deposited as active layer. The response wavelength peak occurs at around 380 nm corresponding to ZnO energy bandgap of 3.2 eV .The I-V measurements indicates the Schottky behavior of ZnO on Al contact.

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35

Chen, Jiun-Ting, Wei-Chih Lai, Chi-Heng Chen, Ya-Yu Yang, Jinn-Kong Sheu, and Li-Wen Lai. "Electroluminescence of ZnO nanocrystal in sputtered ZnO-SiO_2 nanocomposite light-emitting devices." Optics Express 19, no. 12 (June 3, 2011): 11873. http://dx.doi.org/10.1364/oe.19.011873.

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36

Yu, W. D., X. M. Li, and X. D. Gao. "Self-catalytic synthesis and photoluminescence of ZnO nanostructures on ZnO nanocrystal substrates." Applied Physics Letters 84, no. 14 (April 5, 2004): 2658–60. http://dx.doi.org/10.1063/1.1695097.

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37

do Valle, Anderson Luis, Anielle Christine Almeida Silva, Francielli C. C. Melo, Guilherme de L. Fernandes, Guedmiller Souza de Oliveira, Noelio Oliveira Dantas, Luciano Pereira Rodrigues, and Luiz Ricardo Goulart Filho. "Glyphosate: ZnO Nanocrystal Interaction Controlled by pH Changes." IEEE Sensors Journal 21, no. 18 (September 15, 2021): 19731–39. http://dx.doi.org/10.1109/jsen.2021.3099471.

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38

Abebe, Buzuayehu, and H. C. Ananda Murthy. "Insights into ZnO-based doped porous nanocrystal frameworks." RSC Advances 12, no. 10 (2022): 5816–33. http://dx.doi.org/10.1039/d1ra09152b.

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The synthesis of doped nanocomposites under the control of surfactants has outstanding potential for the photocatalytic degradation of dyes and antibacterial activity. 4D-STEM detector mode gathers real-space atomic-resolution images with high-speed and efficient detection.

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39

Si, Shufeng, Shuo Li, Zhengqiu Ming, and Linpei Jin. "Humidity sensors based on ZnO Colloidal nanocrystal clusters." Chemical Physics Letters 493, no. 4-6 (June 2010): 288–91. http://dx.doi.org/10.1016/j.cplett.2010.05.013.

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40

Morfa, Anthony J., Gary Beane, Benjamin Mashford, Birendra Singh, Enrico Della Gaspera, Alex Martucci, and Paul Mulvaney. "Fabrication of ZnO Thin Films from Nanocrystal Inks." Journal of Physical Chemistry C 114, no. 46 (November 3, 2010): 19815–21. http://dx.doi.org/10.1021/jp107043z.

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41

Shi, D., X. C. Wang, Z. W. Yao, F. Liu, X. B. Zhang, and J. P. Cheng. "Wettability of porous two-dimensional ZnO nanocrystal films." Canadian Journal of Chemical Engineering 89, no. 6 (March 3, 2011): 1583–89. http://dx.doi.org/10.1002/cjce.20492.

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42

Armah, Esau Nii Abekah Akwetey, Martin Egblewogbe, Hubert Azoda Koffi, Alfred Ato Yankson, Francis Kofi Ampong, Francis Boakye, Josef Kwaku Ametefee Amuzu, and Robert Kwame Nkum. "Solubility of Mn in ZnO Crystallites Synthesized Using Solid State Techniques." Advanced Nano Research 3, no. 1 (September 30, 2020): 28–39. http://dx.doi.org/10.21467/anr.3.1.28-39.

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Powder samples of Zn1-xMnxO nanocrystal were synthesized at a temperature of 200 °C using solid phase method. Dopant concentrations of 0.005 ≤ x ≤ 0.5 were studied. Powder x-ray diffraction (PXRD) patterns of the samples were analyzed with a view of determining the onset of secondary phases, hence the solubility limit of the dopant. The solubility limit for Mn in ZnO samples synthesized at 200 °C is realized at x < 0.3. With a regular pattern in increment of the Mn concentration, there were variations observed in the trend of the relative intensity, 2θ position and d-spacing indicating uneven addition of Mn (thus Mn2+, Mn3+ or Mn4+).

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43

Greenberg, Benjamin L., Zachary L. Robinson, Yilikal Ayino, Jacob T. Held, Timothy A. Peterson, K. Andre Mkhoyan, Vlad S. Pribiag, Eray S. Aydil, and Uwe R. Kortshagen. "Metal-insulator transition in a semiconductor nanocrystal network." Science Advances 5, no. 8 (August 2019): eaaw1462. http://dx.doi.org/10.1126/sciadv.aaw1462.

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Many envisioned applications of semiconductor nanocrystals (NCs), such as thermoelectric generators and transparent conductors, require metallic (nonactivated) charge transport across an NC network. Although encouraging signs of metallic or near-metallic transport have been reported, a thorough demonstration of nonzero conductivity, σ, in the 0 K limit has been elusive. Here, we examine the temperature dependence of σ of ZnO NC networks. Attaining both higher σ and lower temperature than in previous studies of ZnO NCs (T as low as 50 mK), we observe a clear transition from the variable-range hopping regime to the metallic regime. The critical point of the transition is distinctly marked by an unusual power law close to σ ∝ T1/5. We analyze the critical conductivity data within a quantum critical scaling framework and estimate the metal-insulator transition (MIT) criterion in terms of the free electron density, n, and interparticle contact radius, ρ.

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44

Ghifari, Najla, Rachid Bennacer, Adil Chahboun, and Abdel I. El Abed. "Hierarchical Self-Assembly of Dipolar ZnO Nanoparticles and Microdroplets." Micromachines 13, no. 9 (September 14, 2022): 1522. http://dx.doi.org/10.3390/mi13091522.

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In this work, we investigated the orientation and the polarization of ZnO nanoparticles, which serve as building blocks of highly monodisperse microspheres, using a droplet microfluidic-assisted synthesis method. We observe, for the first time, a square lattice organization of liquid microdroplets, in a steady state, at the oil/water interface. Such square organization reveals clearly a dipolar organization of ZnO nanoparticles at the surfaces of droplets at the early stage of ZnO nanocrystal aggregation and microsphere formation. We discuss different models of organization of ZnO nanoparticles and show that the well-known tip-streaming effect in droplets in microfluidics explains the reason for the obtained dipolar droplets. The square organization is illustrated and explained.

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45

Di Marcantonio, M., J. E. Namanga, V. Smetana, N. Gerlitzki, F. Vollkommer, A. V. Mudring, G. Bacher, and E. Nannen. "Green-yellow emitting hybrid light emitting electrochemical cell." Journal of Materials Chemistry C 5, no. 46 (2017): 12062–68. http://dx.doi.org/10.1039/c7tc02976d.

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Greenish light-emitting electrochemical cells (LECs) reaching a lifetime of 271 hours at luminance of 1500 cd m⁻² were realized by the introduction of a fluorinated ionic transition metal complex (iTMC) inside the ZnO nanocrystal hybrid-LEC device structure.

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46

Armah, Esau Abekah, Francis Kofi Ampong, Martin Egblewogbe, Hubert Azoda Koffi, Francis Boakye, Josef Kwaku Ametefee Amuzu, and Robert Kwame Nkum. "Solubility of Mn in ZnO Nanocrystallites using Wet Chemical Synthesis." Advanced Nano Research 2, no. 1 (November 5, 2019): 53–61. http://dx.doi.org/10.21467/anr.2.1.53-61.

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There is a substantial amount of literature dealing with many aspects of synthesis and characterization of pure and doped binary compounds including Mn-doped ZnO which has been widely studied due to its superb properties as a dilute magnetic semiconductor (DMS). Aspects concerning doping limits for these compounds is an important stage in the search for new materials. Samples of Zn1-xMnxO nanocrystal were synthesized at temperatures of 180 °C and 200 °C using wet or liquid phase synthesis method. Dopant concentrations x=0.5, 1, 1.5, 2, 2.5, 5, 10, 20, 30, 40 and 50 per cent were studied. Powder x-ray diffraction (PXRD) patterns of the samples were analyzed with a view to determining the onset of secondary phases and hence the solubility limit of the dopant. The solubility limit for Mn in ZnO samples synthesized at temperature of 200 °C is realized at x <20%. For samples synthesized at temperature of 180 °C, the solubility limit is x <0.5%.

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47

Nakamura, Y., T. Ishibe, T. Taniguchi, T. Terada, R. Hosoda, and Sh Sakane. "Semiconductor Nanostructure Design for Thermoelectric Property Control." International Journal of Nanoscience 18, no. 03n04 (March 28, 2019): 1940036. http://dx.doi.org/10.1142/s0219581x19400362.

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We present the methodologies for developing high-performance thermoelectric materials using nanostructured interfaces by reviewing our three studies and giving the new aspect of nanostructuring results. (1) Connected Si nanocrystals exhibited ultrasmall thermal conductivity. The drastic thermal conductivity reduction was brought by phonon confinement and phonon scattering. Here, we present discussion about the new aspect for phonon transport: not only nanocrystal size but also shape can contribute to thermal conductivity reduction. (2) Si films including Ge nanocrystals demonstrated that phonon and carrier conductions were independently controlled in the films, where carriers were easily transported through the interfaces between Si and Ge, while phonons could be effectively scattered at the interfaces. (3) Embedded-ZnO nanowire structure demonstrated the simultaneous realization of power factor increase and thermal conductivity reduction. The [Formula: see text] increase was caused by the interface-dominated carrier transport. The nanowire interfaces also worked as phonon scatterers, resulting in the thermal conductivity reduction.

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48

Dharani, A. P., A. Sales Amalraj, S. Christina Joycee, V. Sivakumar, and G. Senguttuvan. "Influence of Seed Layer on Surface Morphology of ZnO Thin Films Grown by SILAR Method." International Journal of Nanoscience 19, no. 02 (March 16, 2020): 1950005. http://dx.doi.org/10.1142/s0219581x19500054.

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Zinc oxide (ZnO) nanostructured seed layer was grown by successive ionic layer adsorption and reaction (SILAR) method on glass substrate. The as-prepared nanostructured seed layer was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) for its structure and surface morphology. XRD results showed a ZnO seed layer growth oriented along the (100) direction. Study of surface morphology showed ZnO nanocrystal clusters with hexagonal shape. ZnO nanorods (NRs) have been grown over the as-prepared ZnO nanostructured seed layer by immersing seed layer substrate in a chemical bath. It has been found that the morphology of the nanostructured seed layer is a key influencing factor for the growth of vertical ZnO NRs. In our growth method, we were successful in growing vertical NRs with diameter of about 100–240[Formula: see text]nm with perfect hexagonal shape. The transmittance studies were carried out to analyze the optical bandgap of the as-grown ZnO nanorods.

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49

Il’ves, V. G., and S. Yu Sokovnin. "Structural and Magnetic Properties of Nanopowders and Coatings of Carbon-Doped Zinc Oxide Prepared by Pulsed Electron Beam Evaporation." Journal of Nanotechnology 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4628193.

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With the help of electron beam evaporation of mechanical mixtures of nonmagnetic micron powders ZnO and carbon in vacuum with the subsequent annealing of evaporation products in air at the temperature of 773 K, single-phase crystal nanopowders ZnO-C were produced with the hexagonal wurtzite structure and low content of the carbon dopant not exceeding 0.25 wt%. It was established that doping ZnO with carbon stimulates primary growth of nanoparticles along the direction 0001 in the coatings. Nanocrystal growth in coatings occurs in the same way as crystal growth in thin films, with growth anisotropy in the c-axis direction in wurtzite ZnO. Element mapping has confirmed homogeneous distribution of carbon in ZnO lattice. Ferromagnetism of single-phase crystal nanopowders ZnO-C with the hexagonal wurtzite structure and low content of the carbon dopant not exceeding 0.25 wt% was produced at room temperature. Ferromagnetic response of the doped NP ZnO-C has exceeded the ferromagnetic response of pure NP ZnO 5 times. The anhysteretic form of magnetization curves NP ZnO-C indicates aspiration of samples to superparamagnetism manifestation.

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50

Zhou, Xin, Chao Yan, Rui Deng, Yufeng Hu, Zhenbo Deng, Qiuhong Cui, Zhidong Lou, Yanbing Hou, and Feng Teng. "High‐Performance Polymer Photodetectors using ZnO Nanocrystal Trap States." physica status solidi (RRL) – Rapid Research Letters 15, no. 6 (March 19, 2021): 2100003. http://dx.doi.org/10.1002/pssr.202100003.

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