Highly sensitive carbon nanotube-embedding gas sensors operating at atmospheric pressure

Ju Hyung Yun, Joondong Kim, Yun Chang Park, Jin Won Song, Dong Hun Shin, Chang Soo Han

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Highly sensitive palladium (Pd) decorated carbon nanotube (CNT) embedding gas sensors working at atmospheric pressure were fabricated. Two types of gas sensors of bare CNTs and Pd nanoparticle decorated CNTs were synthesized by dielectrophoresis. The CNT-containing solution was dropped onto the patterned-platinum electrodes with ac bias. The CNT-embedding sensors sensitively detected 100 ppb level of NO2 in an atmospheric pressure condition. The Pd decoration on CNTs forming the depletion region was found to be an effective way to enhance the sensor response by the control of carrier mobility and density. Raman spectroscopy revealed a low defect ratio of D/G - by heat treatment at 450 °C. Moreover, it was investigated that there exists an optimum temperature to enhance the sensor response.

Original languageEnglish
Article number055503
JournalNanotechnology
Volume20
Issue number5
DOIs
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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