کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9700797 1462130 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Platinum resistive film CO sensor without selective layer
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Platinum resistive film CO sensor without selective layer
چکیده انگلیسی
Response in resistance of platinum thin film sensors were studied in the presence of carbon monoxide under constant operating current. Both oscillatory and non-oscillatory changes in resistance were examined. Oscillations in resistances were found in the CO concentration range from 50 to 1000 ppm at operating temperatures between 80 and 150 °C. Both the amplitude and period increased with the increasing CO concentration. In non-oscillatory region, two different responses were observed, one of which the resistance of the sensor increased with increasing CO concentration and the other, resistance slightly decreased. It is believed that oscillations occurred between two branches of a Langmuir-Hinshelwood reaction mechanism. Above the upper branch of the oscillatory region, the resistance of the Pt films increases quasi linearly with the increase of CO concentration. Conversely, it decreases slightly below the lower branch.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volumes 111–112, 11 November 2005, Pages 130-134
نویسندگان
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