期刊
JOURNAL OF POROUS MATERIALS
卷 19, 期 5, 页码 543-549出版社
SPRINGER
DOI: 10.1007/s10934-011-9503-8
关键词
Nanoporous platinum; Dealloying; Hydrogen gas sensor
资金
- National Science Foundation [NSF PHY-0754360]
A nanoporous platinum (np-Pt) thin film based hydrogen sensor was fabricated and studied. The np-Pt thin films were fabricated through a method of chemical dealloying and coarsening starting from a CuPt alloy. The alloy thin films of CuxPt1-x were deposited by sputtering copper and platinum at the same time. The dealloying process completely removed the copper from the film. We demonstrate a method to control the porosity of np-Pt by a method of coarsening. Scanning electron microscopy confirmed the presence of porosity with size ranging from a few nanometers to tens of nanometers. A sensor device with four electrodes was fabricated on the np-Pt thin films using a stainless steel mask and by sputtering copper. The electrical characteristics of the sensor exhibit marked sensitivity or current changes in the presence of hydrogen. The results demonstrate that np-Pt thin films configured as a gas sensor have high sensitivity to hydrogen.
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