Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 20, Pages 5412-5419Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc00987b
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2014CB931800]
- National Natural Science Foundation of China (NSFC) [21501024, 21501064, 21531003, 21401069, 91622106]
- Jilin Association of Science and Technology
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Gas sensing performances in ZnO sensors are critically limited by their fast electron-hole recombination, low gas selectivity and elevated operation temperature. To alleviate these problems, new and high-performance sensor materials are desirable. Herein, we fabricate a core-shell composite material of POM@ZIF-8@ZnO with an ultrathin ZIF-8 film containing H5PMo10V2O40 polyoxometalate on the ZnO substrate surface. The device based on this composite exhibits an improved gas sensing ability toward formaldehyde (HCHO) at room temperature (25 degrees C) with a sensitivity of approximate to 0.4 ppm. Additionally, the POM@ZIF-8@ZnO material exhibits selective gas responses for reducible gases with small molecular sizes, in particular for a selectivity value of 15.0 for formaldehyde over ethanol. The specific roles of the ZIF-8 shell and POM are discussed in detail: ZIF-8 is responsible for concentrating and recognizing analyte molecules on the ZnO surface, and POM accounts for enhancing the sensing ability. The new material of POM@ZIF-8@ZnO with high performance holds great promise in sensor materials for selective formaldehyde sensing.
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