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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Novel fabrication of an SnO(2) nanowire gas sensor with high sensitivity

Cited 145 times inthomson ciCited 132 times inthomson ci
Title
Novel fabrication of an SnO(2) nanowire gas sensor with high sensitivity
Author
Choi, Young-JinHwang, In-SungPark, Jae-GwanChoi, Kyoung JinPark, Jae-HwanLee, Jong-Heun
Keywords
SENSING PROPERTIES; OXIDE NANOBELTS; NANOSENSORS; FILMS
Issue Date
2008-03
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.19, no.9, pp. -
Abstract
We fabricated a nanowire-based gas sensor using a simple method of growing SnO(2) nanowires bridging the gap between two pre-patterned Au catalysts, in which the electrical contacts to the nanowires are self-assembled during the synthesis of the nanowires. The gas sensing capability of this network-structured gas sensor was demonstrated using a diluted NO(2). The sensitivity, as a function of temperature, was highest at 200 degrees C and was determined to be 18 and 180 when the NO(2) concentration was 0.5 and 5 ppm, respectively. Our sensor showed higher sensitivity compared to different types of sensors including SnO(2) powder-based thin films, SnO(2) coating on carbon nanotubes or single/multiple SnO(2) nanobelts. The enhanced sensitivity was attributed to the additional modulation of the sensor resistance due to the potential barrier at nanowire/nanowire junctions as well as the surface depletion region of each nanowire.
URI
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DOI
10.1088/0957-4484/19/9/095508
ISSN
0957-4484
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MSE_Journal Papers
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