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Highly Flexible and Transparent Single Wall Carbon Nanotube Network Gas Sensors Fabricated on PDMS Substrates

Published online by Cambridge University Press:  01 February 2011

Chi-Won Cho ,
Chae-Hyun Lim ,
Chang-Seung Woo ,
Hyung-Suk Jeon ,
Bonghyun Park ,
Heongkyu Ju ,
Cheol-Jin Lee ,
Sunglyul Maeng ,
Ki-Chul Kim  and
Sang Hyeob Kim
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Chi-Won Cho
Affiliation:
crsmcho@hotmail.comHanyang UniversityElectronics and Computer Engineering17 Haengdangdong, SeongdongguSeoul N/A 133-791Korea, Republic of
Chae-Hyun Lim
Affiliation:
wenger418@ihanyang.ac.kr, Hanyang University, Nanotechnology, 17 Haengdangdong, Seongdonggu, Seoul, N/A, 133-791, Korea, Republic of
Chang-Seung Woo
Affiliation:
wcs0916@nate.com, Hanyang University, Nanotechnology, 17 Haengdangdong, Seongdonggu, Seoul, N/A, 133-791, Korea, Republic of
Hyung-Suk Jeon
Affiliation:
jun4309@nate.com, Hanyang University, Nanotechnology, 17 Haengdangdong, Seongdonggu, Seoul, N/A, 133-791, Korea, Republic of
Bonghyun Park
Affiliation:
ndl@ihanyang.ac.kr, Hanyang University, Nanotechnology, 17 Haengdangdong, Seongdonggu, Seoul, N/A, 133-791, Korea, Republic of
Heongkyu Ju
Affiliation:
h.ju@nano.hanyang.ac.kr, Hanyang University, Nanotechnology, 17 Haengdangdong, Seongdonggu, Seoul, N/A, 133-791, Korea, Republic of
Cheol-Jin Lee
Affiliation:
cjlee@korea.ac.kr, Korea University, Electronics and Computer Engineering, 5-1 Anamdong, Seongbukgu, Seoul, N/A, 136-701, Korea, Republic of
Sunglyul Maeng
Affiliation:
slm221@etri.re.kr, Electronics and Telecommunications Research Institute, Cambridge-ETRI Joint R&D Centre, Daejeon, N/A, 305-350, Korea, Republic of
Ki-Chul Kim
Affiliation:
kckim@etri.re.kr, Electronics and Telecommunications Research Institute, Cambridge-ETRI Joint R&D Centre, Daejeon, N/A, 305-350, Korea, Republic of
Sang Hyeob Kim
Affiliation:
shkim@etri.re.kr, Electronics and Telecommunications Research Institute, Cambridge-ETRI Joint R&D Centre, Daejeon, N/A, 305-350, Korea, Republic of
Seung-Beck Lee
Affiliation:
sbl22@hanyang.ac.kr, Hanyang University, Electronics and Computer Engineering, 17 Haengdangdong, Seongdonggu, Seoul, N/A, 133-791, Korea, Republic of
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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 180o. 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.

Keywords

filmsensorelectrical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 922: Symposium U – Organic and Inorganic Nanotubes – From Molecular to Submicron Structures , 2006 , 0922-U11-10
Copyright
Copyright © Materials Research Society 2006

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