2D layer assembly of Pt-ZnO nanoparticles on reduced graphene oxide for flexible NO₂ sensors2D layer assembly of Pt-ZnO nanoparticles on reduced graphene oxide for flexible NO2 sensors
- Other Titles
- 2D layer assembly of Pt-ZnO nanoparticles on reduced graphene oxide for flexible NO2 sensors
- Authors
- Kang, Joon-Young; Koo, Won-Tae; Jang, Ji-Soo; Kim, Dong-Ha; Jeong, Yong Jin; Kim, Rheehyun; Ahn, Jaewan; Choi, Seon-Jin; Kim, Il-Doo
- Issue Date
- Mar-2021
- Publisher
- Elsevier B.V.
- Keywords
- Metal-organic framework; Graphene oxide; Gas sensor; Flexible sensor; Nitrogen dioxide
- Citation
- Sensors and Actuators, B: Chemical, v.331, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors and Actuators, B: Chemical
- Volume
- 331
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1530
- DOI
- 10.1016/j.snb.2020.129371
- ISSN
- 0925-4005
- Abstract
- 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.
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