Journal ArticleDOI
Selective hydrogen gas nanosensor using individual ZnO nanowire with fast response at room temperature
Oleg Lupan,Oleg Lupan,Veaceslav Ursaki,Guangyu Chai,Lee Chow,Gennadi A. Emelchenko,Ion Tiginyanu,A. N. Gruzintsev,A. N. Redkin +8 more
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In this article, a single ZnO nanowire-based nanoscale sensor fabricated using focused ion beam (FIB/SEM) instrument was used to determine the deep levels related to defects and evaluate the effect of thermal treatment in H2 atmosphere on the emission from ZnOs.Abstract:
In this work, we report on a single ZnO nanowire-based nanoscale sensor fabricated using focused ion beam (FIB/SEM) instrument. We studied the diameter dependence of the gas response and selectivity of ZnO nanowires (NWs) synthesized by chemical vapor phase growth method. The photoluminescence (PL) measurements were used to determine the deep levels related to defects which are presented in the ZnO nanomaterial as well as to evaluate the effect of thermal treatment in H2 atmosphere on the emission from ZnO nanowires. We show that sample annealed in hydrogen leads to passivation of recombination centers thus modifying the NWs properties. We studied the gas response and selectivity of these ZnO nanowires to H2 ,N H 3, i-Butane, CH4 gases at room temperature. Our results indicated that zinc oxide NWs hold a high promise for nanoscale sensor applications due to its capability to operate at room-temperature and its ability to tune the gas response and selectivity by the defect concentration and the diameter of ZnO nanowire. A method is proposed to reduce the nanosensor’s recovery time through the irradiation with an ultraviolet radiation pulse. The sensing mechanisms of ZnO nanowires will be discussed.read more
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25th Anniversary Article: Semiconductor Nanowires – Synthesis, Characterization, and Applications
Neil P. Dasgupta,Jianwei Sun,Jianwei Sun,Chong Liu,Chong Liu,Sarah Brittman,Sarah Brittman,Sean C. Andrews,Sean C. Andrews,Jongwoo Lim,Jongwoo Lim,Hanwei Gao,Hanwei Gao,Ruoxue Yan,Ruoxue Yan,Peidong Yang +15 more
TL;DR: A detailed explanation of the unique properties associated with the one-dimensional nanowire geometry will be presented, and the benefits of these properties for the various applications will be highlighted.
Journal ArticleDOI
One-Dimensional Metal-Oxide Nanostructures: Recent Developments in Synthesis, Characterization, and Applications
TL;DR: A comprehensive review of recent developments in novel synthesis, exceptional characteristics, and prominent applications of one-dimensional nanostructures of tungsten oxides, molybdenum oxide, tantalum oxides and tin oxides is provided in this article.
Journal ArticleDOI
Gas sensors based on one dimensional nanostructured metal-oxides: a review.
TL;DR: This article reviews and evaluates the performance of 1-D nanostructured metal-oxide gas sensors based on ZnO, SnO 2, TiO2, In2O3, WOx, AgVO3, CdO, MoO 3, CuO, TeO2 and Fe2O2.
Journal ArticleDOI
Direct Growth of Freestanding ZnO Tetrapod Networks for Multifunctional Applications in Photocatalysis, UV Photodetection, and Gas Sensing
Yogendra Kumar Mishra,Gaurav Modi,V. Cretu,Vasile Postica,Oleg Lupan,Tim Reimer,Ingo Paulowicz,Viktor Hrkac,Wolfgang Benecke,Lorenz Kienle,Rainer Adelung +10 more
TL;DR: This work demonstrates the versatile and single-step synthesis of ZnO-T with different arm morphologies by a simple flame transport synthesis (FTS) approach, forming a network that will be of interest for various advanced applications.
Journal ArticleDOI
Hydrogen Gas Sensors Based on Semiconductor Oxide Nanostructures
TL;DR: A comprehensive review of the research progress in the last five years concerning hydrogen gas sensors based on SMO thin film and one-dimensional (1D) nanostructures is provided.
References
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Journal ArticleDOI
A comprehensive review of zno materials and devices
Ümit Özgür,Ya. I. Alivov,C. Liu,A. Teke,Michael A. Reshchikov,Seydi Doğan,Vitaliy Avrutin,Sang-Jun Cho,Hadis Morkoç +8 more
TL;DR: The semiconductor ZnO has gained substantial interest in the research community in part because of its large exciton binding energy (60meV) which could lead to lasing action based on exciton recombination even above room temperature.
Journal ArticleDOI
Nanotube molecular wires as chemical sensors
Jing Kong,Nathan R. Franklin,Chongwu Zhou,Michael Chapline,Shu Peng,Kyeongjae Cho,Hongjie Dai +6 more
TL;DR: The nanotubes sensors exhibit a fast response and a substantially higher sensitivity than that of existing solid-state sensors at room temperature and the mechanisms of molecular sensing with nanotube molecular wires are investigated.
Journal ArticleDOI
Mechanisms behind green photoluminescence in ZnO phosphor powders
Karel Vanheusden,William L. Warren,Carleton H. Seager,David R. Tallant,J. A. Voigt,Bruce E. Gnade +5 more
TL;DR: In this article, the authors explore the interrelationships between the green 510 nm emission, the free-carrier concentration, and the paramagnetic oxygen vacancy density in commercial ZnO phosphors by combining photoluminescence, optical absorption, and electron paramagnetic resonance spectroscopies.
Journal ArticleDOI
Zinc oxide nanostructures: growth, properties and applications
TL;DR: In this paper, a review of various nanostructures of ZnO grown by the solid-vapour phase technique and their corresponding growth mechanisms is presented. And the application of nanobelts as nanosensors, nanocantilevers, field effect transistors and nanoresonators is demonstrated.
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Hydrogen as a cause of doping in zinc oxide
Van de Walle,G Chris +1 more
TL;DR: A first-principles investigation, based on density functional theory, produces strong evidence that hydrogen acts as a source of conductivity: it can incorporate in high concentrations and behaves as a shallow donor.