Graphene-based flexible NO2 chemical sensors

Chongmin Lee, Jaehui Ahn, Ki Bong Lee, Donghwan Kim, Jihyun Kim

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We demonstrated graphene-based flexible NO2 chemical sensors on polyethylene terephthalate substrate where graphene was grown on Cu-foil by chemical vapor deposition technique. Introduction of NO2 molecules to graphene caused a rapid increase in the currents due to the charge transfer between NO2 molecules and graphene under both relaxed and strained conditions. However, the recovery was delayed due to slow desorption of NO 2 molecules from defective sites in graphene. Also, strain in graphene increased the resistance of graphene layer where the change in conductance was reversible. Our graphene-based NO2 chemical sensors showed a great sensitivity and reproducibility under both strained and relaxed conditions.

Original languageEnglish
Pages (from-to)5459-5462
Number of pages4
JournalThin Solid Films
Volume520
Issue number16
DOIs
Publication statusPublished - 2012 Jun 1

Keywords

  • Flexible substrate
  • Gas sensor
  • Graphene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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