Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 41, Pages 16017-16021Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp805919t
Keywords
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Funding
- DARPA [HR0011-07-1-0032]
- NSF-REU [DMR-0648962]
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Chemical sensors based on vertically aligned p-type CuO nanowire arrays have been fabricated by in situ micromanipulation in a scanning electron microscope. The sensors are capable of detecting air-diluted H2S to the parts per billion level. Different mechanisms have been proposed for the detections of low and high concentrated H2S. The recoverable detection for low concentrations can be explained by an oxygen adatom related process, while an interface reaction model fits for the high concentration detection, which also explains the exponential sensing response. Furthermore, selective detection for H2S has-also been investigated. The sensor demonstrated strong selectivity for H,S, as compared with the responses to high concentrations of H-2, CO, and NH3.
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