학술논문
Density-controllable growth of SnO nanowire junction-bridging across electrode for low-temperature NO gas detection.
Document Type
Article
Author
Source
Subject
*TIN oxides
*SYNTHESIS of nanowires
*GAS detector design & construction
*NITROGEN dioxide
*PERFORMANCE of gas detectors
*SEMICONDUCTOR detectors
*SEMICONDUCTOR junctions
*TESTING
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Language
ISSN
0022-2461
Abstract
The junction-bridging structure of metal oxide nanowires (NWs) improves gas-sensing properties. In this study, an on-chip growth method was used to fabricate gas sensors, it easily and effectively controls NW junctions. SnO2 NWs were synthesized by thermal evaporation at 800 °C with tin powder as the source. The density of the NW junctions was controlled by changing the mass of the source material. A source material with large mass yielded high-density NW junctions. With electrode spacing of 20 μm, NW junctions were formed from the source material of larger than 2 mg. Gas sensing results revealed that the junction sensors exhibited a good response to NO2 gas at a concentration of 1-10 ppm. The sensors exhibited a good response to NO2 gas at low temperature of up to 100 °C and short response-recovery time (~20 s). The sensors also had good selectivity to NO2 gas. The response ( Rgas/Rair) to 1 ppm NO2 was as high as 22 at 100 °C, whereas the cross gas responses (Rair/Rgas) to 10 ppm CO, 10 ppm H2S, 100 ppm C2H5OH, and 100 ppm NH3 were negligible (1.1-1.3). [ABSTRACT FROM AUTHOR]