期刊
IEEE TRANSACTIONS ON NANOTECHNOLOGY
卷 16, 期 5, 页码 820-825出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNANO.2017.2670661
关键词
Alcohols; frequency selectivity; resonant frequency; TiO2 nanorods
类别
资金
- Visvesvaraya Young Faculty Research Fellowship (DeitY, India)
- Indian National Science Academy
- DST-NM, India
Selective detection of vapor species, especially belonging to the same group, is a crucial bottleneck for resistive sensor devices. In this paper, methanol, ethanol, and 2-propanol detection by Pd/TiO2 nanorod array/Ti device in capacitive mode was achieved, with improved selectivity, employing a resonant frequency tuning technique. The optimal capacitive response of the device was obtained by identifying the resonant frequency over the frequency range of 0.01-200 kHz. The imaginary part of the impedance (-vertical bar Z vertical bar sin theta as a function of frequency) in air and in alcohols revealed a shift in resonant frequency towards lower frequency regime upon exposure to alcohols. Moreover, the difference in the resonant frequencies (Delta f) from one alcohol to another were found to be almost constant which facilitated the frequency-selective sensing even for varying concentrations of target species (1, 50, and 100 ppm in present case). Such frequency selective nature of the device possibly originated from different degree of polarization of different alcohol molecules at different frequencies which was duly correlated to the corresponding equivalent circuit model. However, for real selective detection, when the target species is unknown, the proposed device does not work properly and an array of devices is necessary.
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