The gas sensing properties of single-walled carbon nanotubes deposited on an aminosilane monolayer

Thu Hong Tran, Jin Woo Lee, Kyongsoo Lee, Yang Doo Lee, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


This paper presents our study on the effects of an aminosilane monolayer on the gas sensing properties of single-walled carbon nanotubes (SWCNTs). A gas sensor for nitrogen dioxide (NO2) detection was fabricated by conventional photolithography process on an oxidized silicon wafer functionalized with 3-aminopropyltriethoxysilane (APTES). Such a CNT-based gas sensor was found to result in high sensitivity and fast response time compared with the sensor fabricated on a non-silanised surface. The amine groups in the APTES monolayer, electron donating in nature, played a role of charge transfer to the semiconducting SWCNTs, and hence the amount of electrons transferred from SWCNTs to NO2 molecules increased. Our results suggest that the APTES intended originally for selective placement of individual SWCNTs could be used to enhance the gas sensing properties of the SWCNTs.

Original languageEnglish
Pages (from-to)67-71
Number of pages5
JournalSensors and Actuators, B: Chemical
Issue number1
Publication statusPublished - 2008 Jan 29

Bibliographical note

Funding Information:
This work was supported in part by MIC and IITA through the IT Leading R&D Support Project. The authors thank the government for financial support.


  • Electron donation
  • Gas sensor
  • Nitrogen dioxide (NO)
  • Self-assembled monolayer (SAM)
  • Single-walled carbon nanotubes (SWCNTs)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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