期刊
CERAMICS INTERNATIONAL
卷 46, 期 10, 页码 15858-15866出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.03.133
关键词
Metal-organic frameworks; H2S sensor; p-n junction; ZnO/CuO composite
资金
- National Natural Science Foundation of China [61471233, 51590902]
- Program for Professor of Special Appointment (Eastern Scholar) at SIHL
- Gaoyuan Discipline of Shanghai-Environmental Science and Engineering (Resource Recycling Science and Engineering)
The bimetallic metal-organic frameworks (MOF) Zn/Cu-BTC were prepared by a facile solvothermal method in one step and used as a self-sacrificed template to obtain the ZnO/CuO composites. The composites with different Cu/Zn molar ratios were characterized by XRD, FESEM, and XPS. The ZnO/CuO composite exhibited an octahedral structure, and a p-n heterojunction may be formed between p-type CuO and n-type ZnO. To prove its functional characteristics, the ZnO/CuO composite was used as a sensing material to test its gas sensitivity. The effect of Cu/Zn molar ratios was examined, and the results showed that the optimized ZnO/CuO (1: 0.33) composite based gas sensor exhibited reasonable selectivity to 10 ppm H2S, operated at 40 degrees C. The sensitivities were improved by 17.1 times and 327.8 times compared with the pristine CuO and ZnO based gas sensors, respectively. Moreover, the detection limit to H2S of such sensors could be reduced as low as 300 ppb. The sensing mechanism has been thoroughly studied and such ZnO/CuO composite is an ideal candidate for highly sensitive detection for H2S with low power consumption in the real application.
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