Nanocomposite NiO:Au hydrogen sensors with high sensitivity and low operating temperature

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• 作者：M. K ; yla ; C. Chatzimanolis-Moustakas ; E.P. Koumoulos ; C. Charitidis ; M. Kompitsas
• 关键词：A. Composites ; A. Oxides ; B. Sputtering ; B. Laser deposition ; D. Electrochemical properties
• 刊名：Materials Research Bulletin
• 出版年：January, 2014
• 年：2014
• 卷：49
• 期：Complete
• 页码：552-559
• 全文大小：1751 K

文摘

We present results on the development of nanocomposite NiO:Au thin-film hydrogen sensors, which are able to detect hydrogen concentrations as low as 2 ppm in air, operating at low temperatures in the range 125-150 掳C. Thin NiO films were sputter-deposited on oxidized silicon substrates. The structural, morphological, and nanomechanical properties of the films were investigated with respect to post-deposition annealing. Au nanoparticles were added on the NiO surface via pulsed laser deposition and the films were tested as hydrogen sensors before and after Au deposition. The performance of the NiO films as hydrogen sensors improved significantly in the presence of Au nanoparticles on the surface. The detection limit (lowest detectable hydrogen concentration) decreased by two orders of magnitude, while the response time also decreased by a factor of three.