2D Layer Assembly of Pt-ZnO Nanoparticles on Reduced Graphene Oxide for Flexible NO2 Sensors

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The low response and sluggish reaction kinetics of graphene-based gas sensors remain as obstacles for practical applications as wearable chemical sensors. To overcome these limitations, we demonstrate a heterogeneous sensitization of nanocatalysts using Pt and ZnO nanoparticles (NPs) on porous reduced graphene oxides (Pt_ZnO/PRGO) driven by a metal-organic framework (MOF)-templated synthesis and subsequent pyrolysis. The pyrolysis of zeolitic imidazolate framework-8 layers grown on graphene oxide leads to the creation of porous carbon frameworks decorated with catalytic Pt and ZnO NPs, which possess increased reaction sites for the target gas. In addition, we investigated the effect of pyrolysis conditions to control the size of ZnO NPs with a 10 nm scale for enhanced catalytic sensitization. As a result, Pt_ZnO/PRGO exhibited improved NO2 sensing properties with regard to response (43.28 % to 5 ppm), selectivity, and detection limit (0.1 ppm), as well as having reversible reaction kinetics. Potential applications of MOF-derived Pt_ZnO/PRGO in wearable chemical sensors was demonstrated, in which the material exhibited excellent mechanical stability and reliable response after 450 bending cycles.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2021-03
Language
English
Article Type
Article
Citation

SENSORS AND ACTUATORS B-CHEMICAL, v.331, pp.129371

ISSN
0925-4005
DOI
10.1016/j.snb.2020.129371
URI
http://hdl.handle.net/10203/281547
Appears in Collection
MS-Journal Papers(저널논문)
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