期刊
NANOTECHNOLOGY
卷 33, 期 36, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac7475
关键词
AuPd NPs; toluene; ZIF-8; core-shell structure; gas sensor
资金
- Major National Science and Technology Special Projects [2016ZX02301003-004-007]
- Youth Foundation of National Natural Science Foundation of China [62003123]
- National Natural Science Foundation of Hebei province [F2020202067]
- Key Laboratory of Electronic Materials and Devices of Tianjin, China
In this study, core-shell AuPd nanoparticles sensitized Co3O4/ZnO@ZnO ellipsoid nanoparticles were successfully synthesized and showed significantly enhanced gas sensing properties. The gas sensing performance was greatly improved after noble metal decoration, and the synergistic effect of Au and Pd played a key role in enhancing the sensing mechanism.
In this work, core-shell AuPd nanoparticles (NPs) sensitized Co3O4/ZnO@ZnO ellipsoid nanoparticles was successfully synthesized via a simple liquid phase synthesis method. SEM and TEM characterization results showed that the as-prepared samples have core-shell ellipsoid morphology and the size of the nanoparticles were uniform. Systematic gas sensing characterization was carried out to obtain the gas sensing property of AuPd NPs decorated Co3O4/ZnO@ZnO. It was found that the gas sensing property could be significantly enhanced after noble metal decoration with Au, Pd and AuPd NPs, respectively. The optimal gas sensing performance was achieved by AuPd NPs functionalized Co3O4/ZnO@ZnO based gas sensor. The maximum response reached 256-100 ppm toluene at 250 degrees C, which is 50 degrees C lower than pure ZnO. The detection limit of AuPd functionalized Co3O4/ZnO@ZnO was as low as 100 ppb. The enhanced sensing mechanism was mainly attributed to the synergistic effect of Au and Pd, which was detailly discussed in gas sensing mechanism part.
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