Selective hydrogen gas nanosensor using individual ZnO nanowire with fast response at room temperature
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LUPAN, Oleg, URSAKI, Veacheslav, CHAI, Guangyu, CHOW, Lee, EMELCHENKO, Gennady A., TIGINYANU, Ion, GRUZINTSEV, Alex N., REDKIN, A.N.. Selective hydrogen gas nanosensor using individual ZnO nanowire with fast response at room temperature. In: Sensors and Actuators, B: Chemical, 2010, vol. 144, pp. 56-66. ISSN -. DOI: https://doi.org/10.1016/j.snb.2009.10.038
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Sensors and Actuators, B: Chemical
Volumul 144 / 2010 / ISSN - /ISSNe 0925-4005

Selective hydrogen gas nanosensor using individual ZnO nanowire with fast response at room temperature

DOI: https://doi.org/10.1016/j.snb.2009.10.038

Pag. 56-66

Lupan Oleg12, Ursaki Veacheslav3, Chai Guangyu1, Chow Lee1, Emelchenko Gennady A.45, Tiginyanu Ion6, Gruzintsev Alex N.5, Redkin A.N.5
 
1 University of Central Florida,
2 Technical University of Moldova,
3 Institute of Applied Physics, Academy of Sciences of Moldova,
4 Institute of Solid State Physics, Russian Academy of Science,
5 Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences,
6 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu" of the Academy of Sciences of Moldova
 
Disponibil în IBN: 5 aprilie 2018


Rezumat

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, NH3, 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.

Cuvinte-cheie
Focused ion beam, hydrogen, nanosensor, sensor, ZnO nanowire