期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 139, 期 2, 页码 453-459出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.03.069
关键词
Methane; Sensor; Palladium/MWCNT nanocomposites; ITO glass
资金
- National Natural Science Foundation of China [50534100]
- 2008 Undergraduate Creative Foundation of Taiyuan City [08122055]
Palladium nanoparticles (PdNPs) were electrolessly deposited on 1,6-hexanediamine grafted multi-walled carbon nanotubes (MWCNTs) to form nanocomposite which was then characterized by scanning electron microscopy, proton nuclear magnetic resonance spectroscopy, and infrared spectroscopy. First, the electrocatalytic activity of MWCNT/PdNPs for methane (CH4) on a gold electrode in 0.50 M H2SO4 Was studied by cyclic voltammetry and the results demonstrated that MWCNT/PdNPs could be employed to oxidize CH4. A simple CH4 sensor was then fabricated by depositing the MWCNT/PdNPs nanocomposite onto an indium tin oxide substrate. The effects of carrier gas, amount of nanocomposite and temperature on the response of the sensor were investigated in detail. The sensor exhibits good sensitivity and selectivity to CH4 in dry air at ambient conditions. it showed linear response to CH4 at 0-16% v/v with a detection limit of 0.167% v/v(signal/noise = 3). The response and recovery times were less than 35 and 12 s, respectively. Common gases such as N-2, CO and CO2 showed no interference but H-2 and NH3 displayed slight interference to the sensor. (C) 2009 Elsevier B.V. All rights reserved.
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