Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 118, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2020.105221
Keywords
ZnO; CeO2; Acetone; Photo-excitation; Gas sensor
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Funding
- National Natural Science Foundation of Tianjin [17JCTPJC54500]
- Major National Science and Technology Special Projects [2016ZX02301003-004-007]
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In this work, pure ZnO and CeO2-ZnO nanomaterials with CeO2 doping amounts of 6.04 wt%, 7.04 wt% and 8.04 wt% were synthesized by a one-step hydrothermal method. XRD, SEM, N-2 adsorption-desorption measurement, XPS and UV-vis spectroscopy were carried out to characterize the morphological and crystallization information of the material. Gas sensing measurements of CeO2-ZnO nanomaterials based gas sensor were conducted, it was found that 7.04 wt% CeO2-ZnO had the best gas sensing property with shorter response and recovery time (4 s/3 s)and higher response (61.92) which is more than five times than that of pure ZnO to 100 ppm acetone at 75 degrees C. Moreover, the sensor based on 7.04 wt% CeO2-ZnO had low detection limit of 2.71 to 2 ppm acetone at 75 degrees C. With the irradiation of visible light, 7.04 wt% CeO2-ZnO shows the response up to 104.36 to 100 ppm acetone at 75 degrees C which is 68% higher than that without visible light, indicating that the sensor response is significantly enhanced by photo-excitation effect. Furthermore, the sensing mechanism of sensors and the mechanism of photo-excitation were detailedly discussed.
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