کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
751109 | 895198 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of ‘Pt’ loading in ZnO–CuO hetero-junction material sensing carbon monoxide at room temperature Effect of ‘Pt’ loading in ZnO–CuO hetero-junction material sensing carbon monoxide at room temperature](/preview/png/751109.png)
Sensing of carbon monoxide (CO) was carried out with ZnO–CuO and Pt/ZnO–CuO. Synthesized materials were characterized by temperature-programmed reduction (TPR), high-resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD). The composite materials of ZnO–CuO were found to have an active sensing center, The sensor response obtained for an optimized ratio of ZnO and CuO (1:1 weight ratio) yielded the highest response of 1.28 (Rco/Rair) for 1000 ppm of CO at room temperature; the response and recovery times were found to be 41 and 86 s, respectively. However, loading 1:1 ZnO–CuO with 0.4% Pt boosted the sensor response to 2.64 (Rco/Rair) for the same CO concentration. The sensor (0.4% Pt/ZnO–CuO) response was linear towards CO concentrations between 100 and 1000 ppm. In the Pt loaded case both the response and recovery times were found to be 81 s. A mechanism for CO sensor response was put forward with reference to CO adsorption and desorption.
Journal: Sensors and Actuators B: Chemical - Volume 153, Issue 2, 20 April 2011, Pages 321–328