Highly flexible and transparent single wall carbon nanotube network gas sensors fabricated on PDMS substrates

Chi Won Cho, Chae Hyun Lim, Chang Seung Woo, Hyung Suk Jeon, Bonghyun Park, Heongkyu Ju, Cheol Jin Lee, Sunglyul Maeng, Ki Chul Kim, Sang Hyeob Kim, Seung Beck Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We report on the basic characteristics and gas sensing operation of density controlled single-walled carbon nanotube (SWCNT) thin films on poly(dimethyl siloxane) (PDMS) substrates. The vacuum filteration and PDMS mold transfer method allowed the density of SWCNT distributed to have non-local uniformity. The optical transparency of the SWCNT thin films was inversely proportional to SWCNT density and conductivity. The flexible SWCNT thin film showed high mechanical stability with negligible change in conductance after being bent by 180°. We evaluated its gas sensing operation depending on SWCNT density and bias voltage. It was shown that lower SWCNT density thin films had higher sensitivity to NH3 gas, which may be due to higher exposed surface area for lower density SWCNT thin films. Also, we found that lower bias voltage devices showed faster recovery times. The results show that vacuum filteration and mold transfer method produced flexible SWCNT thin films that have stable mechanical and electrical characteristics and also stable gas sensing capabilities making them applicable to future flexible integrated sensors.

Original languageEnglish
Title of host publicationOrganic and Inorganic Nanotubes
Subtitle of host publicationFrom Molecular to Submicron Structures
PublisherMaterials Research Society
Pages95-101
Number of pages7
ISBN (Print)1558998799, 9781558998797
DOIs
Publication statusPublished - 2006
Event2006 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2006 Apr 172006 Apr 21

Publication series

NameMaterials Research Society Symposium Proceedings
Volume922
ISSN (Print)0272-9172

Other

Other2006 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period06/4/1706/4/21

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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