کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10411047 | 894540 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gas sensing with films of nanocrystalline WO3 and Pd made by advanced reactive gas deposition
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Films consisting of nanocrystalline WO3 and Pd, produced by advanced reactive gas deposition, were investigated for gas sensing applications. X-ray diffractometry and electron microscopy showed that as-deposited WO3 and Pd had tetragonal and cubic structures, respectively, both with an average grain size of â¼5Â nm. The films had Pd/W atomic ratios of 0, 0.5 and 13% and were sintered at temperatures up to 873Â K. Gas sensing properties of the films, manifested in relative conductivity changes, were studied for exposure to H2S and CHOH at operation temperatures up to 773Â K. It was found that the addition of Pd decreased the recovery time of the sensor, furthermore increased the low-concentration sensitivity for H2S and that the devices exhibited extreme room-temperature sensitivities, of up to â¼5000 for 10Â ppm for H2S. An unambiguous response, with a sensitivity of â¼10, was observed for as little as 0.5Â ppm of H2S. The sensors were also able to detect 45Â ppm of CHOH. In addition it is shown that Pd doping widens the number of detectable gases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 105, Issue 2, 28 March 2005, Pages 283-289
Journal: Sensors and Actuators B: Chemical - Volume 105, Issue 2, 28 March 2005, Pages 283-289
نویسندگان
A. Hoel, L.F. Reyes, S. Saukko, P. Heszler, V. Lantto, C.G. Granqvist,