Effect of Pr/Zn on the anti-humidity and acetone-sensing properties of Co3O4 prepared by electrospray |
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| Authors: | Xiangxiang Fan Junfeng Wang Chuanlong Sun Chun Huang Yujie Lu Pan Dai Yajuan Xu Wuming He |
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| Institution: | School of Information Engineering, Huzhou University, Huzhou 313000 China.; Zhejiang Province Key Laboratory of Smart Management & Application of Modern Agricultural Resources, Huzhou University, Huzhou 313000 China |
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| Abstract: | Co3O4 is a P-type metal-oxide semiconductor which can realize acetone detection at a lower temperature, but the lower working temperature brings the enhanced humidity effect. In order to solve the problem of a Co3O4 gas sensor being easily affected by humidity, an acetone-sensing material of Co3O4 mixed with Pr/Zn was prepared by electrospray in this work. The optimal working temperature of Pr/Zn–Co3O4 is 160 °C, and the detection limit can reach 1 ppm. The fluctuation of the acetone response is about 7.7% in the relative humidity range of 30–90%. Compared with pure Co3O4, the anti-humidity property of this material is obviously enhanced, but the gas-sensing response deteriorates. Compared with Pr–Co3O4, the anti-humidity and acetone sensing properties of Pr/Zn–Co3O4 were both improved. The morphology, composition, crystal state and energy state of the material were analyzed by SEM, EDS, XRD and XPS. The material of Pr/Zn–Co3O4 is a multi-component mixed material composed of PrCoO3, ZnO, Pr6O11 and Co3O4. The improved anti-humidity and acetone sensing properties exhibited by this material are the result of the synergistic effect of ZnO and Pr3+.With the synergistic effect of Pr and Zn, the material of Co3O4 mixed with Pr/Zn exhibits improved properties of anti-humidity and acetone sensitivity. |
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