期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 289, 期 -, 页码 144-152出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.090
关键词
Zinc oxide; Gas sensor; ZIF-8; Hierarchical hollow nanocube; Quantum dot
资金
- self-determined research funds of CCNU from the colleges' basic research and operation of MOE
As an important semiconductor metal oxide, zinc oxide has been intensely investigated for the application of gas-sensing. Herein, we developed a metal-organic framework (MOF)-based strategy to synthesize novel hierarchical hollow ZnO nanocages with quantum dots (denoted as HHQD-ZnO nanocages). For comparison, solid ZnO and hollow ZnO nanocages derived from the rhombic dodecahedral (RD) ZIF-8 and 470-ZIF-8, respectively have also been synthesized. Gas sensing measurement indicated that the sensor based on the HHQD-ZnO nanocages exhibits super high response of 139.41 upon 100 ppm ethanol at 325 degrees C. In addition, the HHQD-ZnO nanocages-based sensor can detect ethanol gas at a detection limit of well below 25 ppb with the response of 5.1. Such excellent performance, especially the ultrahigh response to ethanol is explained with respect to particle-inter-penetrating framework with good connectivity, hierarchical porous hollow nanostructure and quantum dots.
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