The Surface Scattering-Based Detection of Hydrogen in Air Using a Platinum Nanowire
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- 作者：Fan Yang ; Keith C. Donavan ; Sheng-Chin Kung ; Reginald M. Penner
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：June 13, 2012
- 年：2012
- 卷：12
- 期：6
- 页码：2924-2930
- 全文大小：482K
- 年卷期：v.12,no.6(June 13, 2012)
- ISSN：1530-6992
文摘
The performance of a single platinum (Pt) nanowire for detecting H2 in air is reported. A Pt nanowire shows no resistance change upon exposure to H2 in N2, but H2 exposure in air causes a reversible resistance decrease for H2 concentrations above 10 ppm. The amplitude of the resistance change induced by H2 exposure and the time rate of change of the nanowire resistance both increased with increasing temperature from 298 to 550 K. This resistance decrease of the Pt nanowire in the presence of H2 results from reduced electron diffuse scattering at hydrogen-covered Pt surfaces as compared with oxygen-covered platinum surfaces, we hypothesize. The properties for the detection of H2 in air of single Pt and Pd nanowires of similar size are compared in this study. Pt nanowires have a limit-of-detection for H2 (LODH2) of 10 ppm; 3 orders of magnitude lower than for Pd nanowires of the same size, as well as a response time that is 1/100th of Pd for [H2] 鈮?1%.