Graphene-based flexible NO 2 chemical sensors

Chongmin Lee, Jaehui Ahn, Ki Bong Lee, Donghwan Kim, Ji Hyun Kim

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We demonstrated graphene-based flexible NO 2 chemical sensors on polyethylene terephthalate substrate where graphene was grown on Cu-foil by chemical vapor deposition technique. Introduction of NO 2 molecules to graphene caused a rapid increase in the currents due to the charge transfer between NO 2 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 NO 2 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
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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