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Effect of Calcination Temperature on {\hbox {NO}}_{2} Sensing Properties for Quantum Size ZnO Crystals

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6 Author(s)
Shouli Bai ; State Key Lab. of Chem. Resource Eng., Beijing Univ. of Chem. Technol., Beijing, China ; Jingwei Hu ; Dianqing Li ; Ruixian Luo
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Quantum size ZnO crystals have been synthesized successfully by a room temperature sol-gel process using oleic acid (OA) as capping agent to control the particle size. The particle size and structure of ZnO nanocrystals have been charactirized by X-ray diffraction (XRD), transmission electron microscope (TEM) and Raman spectra analysis methods. The sensor based on ZnO powder calcined at 400 °C for 1 h exhibits the highest response of 280 to NO2 and the selectivity to CO and CH4 at the same concentration reaches 31 and 49 at operating temperature of 290 °C. The effect of calcination temperature on the performance of gas sensing has also been studied.

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Sensors Journal, IEEE  (Volume:12 ,  Issue: 5 )