Investigation on formaldehyde gas sensor with ZnO thick film prepared through microwave heating method |
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Authors: | Xiangfeng Tongyun Wangbing Banqiao Hengfu |
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Affiliation: | aSchool of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, PR China;bAnhui Key Laboratory of Coal Clean Conversion & Utilization, Anhui University of Technology, Maanshan 243002, Anhui, PR China |
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Abstract: | ZnO nanopowders were prepared through microwave heating method. ZnO thick film sensors were fabricated by using ZnO nanopowders as sensing materials. The phase composition and morphology of the material particles were characterized by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The gas-sensing properties of the sensors based on ZnO nano-materials were investigated. It was found that the sensor based on ZnO nano-materials (low power, 10× 10 min) exhibited very high responses to benzene and toluene when operating at 440 and 370 °C, respectively; but the sensor based on ZnO (low power, 10× 10 min) showed very low responses to benzene and toluene when operating at 205–215 °C. The sensor based on ZnO (low power, 10× 10 min) showed high response and good selectivity to dilute formaldehyde when operating at 210 °C; especially, the response to 0.001 ppm HCHO attained 7.4 when operating at 210 °C. |
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Keywords: | Microwave ZnO HCHO Sensor |
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