2D layer assembly of Pt-ZnO nanoparticles on reduced graphene oxide for flexible NO2 sensors

Joon Young Kang, Won Tae Koo, Ji Soo Jang, Dong Ha Kim, Yong Jin Jeong, Rheehyun Kim, Jaewan Ahn, Seon Jin Choi, Il Doo Kim

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number129371
JournalSensors and Actuators, B: Chemical
Volume331
DOIs
StatePublished - 2021 Mar 15

Keywords

  • Flexible sensor
  • Gas sensor
  • Graphene oxide
  • Metal-organic framework
  • Nitrogen dioxide

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