کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7145349 | 1462069 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New method to selectively determine hydrogen sulfide concentrations using CuO layers
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
Within this paper we demonstrate a new method to selectively determine the hydrogen sulfide (H2S) concentration using polycrystalline p-type semiconducting copper(II)oxide (CuO). Unlike commonly pursued approaches that use the resistivity of gas sensitive metal oxide layers to measure a trace gas concentration we show that the effects of a H2S induced percolation phase transition may be utilized to that end. Using a thermal modulation protocol the effects of the phase transition on the electrical behaviour of the layer may be reversed thus restoring the initial state of the layer. This forms the basis for a novel gas detection method using a semiconducting metal oxide layer. To highlight the capabilities in terms of selectivity the novel approach has been evaluated for several relevant oxidizing and reducing gases, including nitrogen dioxide (NO2), sulfur dioxide (SO2), ammonia (NH3) and H2S. The sensor response is determined at different operating temperatures and humidity levels. Due to the unique reaction towards H2S the new method enables a highly selective determination of the H2S concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 222, January 2016, Pages 625-631
Journal: Sensors and Actuators B: Chemical - Volume 222, January 2016, Pages 625-631
نویسندگان
Janosch Kneer, Stefan Knobelspies, Benedikt Bierer, Jürgen Wöllenstein, Stefan Palzer,