期刊
JOURNAL OF EXPERIMENTAL NANOSCIENCE
卷 8, 期 5, 页码 553-566出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/17458080.2011.602368
关键词
hydrogen sensor; carbon nanotubes; palladium nanoparticles; impedance
类别
资金
- Shiraz University Research Council
- Third World Academy of Sciences, Iran Chapter (TWASIC)
A new sensor for the detection of hydrogen at parts per million (ppm) levels was fabricated by coating a thin film of palladium-doped activated single-walled carbon nanotube on the inner wall of a glass tube. The response of the sensor was based on the changes in the impedance of the sensor upon the adsorption of hydrogen molecules. The linear dynamic range of the sensor was from 1 to 50ppm. The relative standard deviation of six replicate analyses of 5ppm of H-2 was 2.1% and the limit of detection was 0.73ppm for H-2 species. Humidity, methane and hydrogen sulphide did not have any serious effect on hydrogen recognition. Also, no interfering effect was observed when 20-fold excess (mass/mass) of carbon dioxide or carbon monoxide was present with hydrogen.
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