Publication: Low-cost and flexible printed graphene-PEDOT:PSS gas sensor for ammonia detection
Issued Date
2014-01-01
Resource Type
ISSN
15661199
Other identifier(s)
2-s2.0-84907207774
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Mahidol University
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SCOPUS
Bibliographic Citation
Organic Electronics: physics, materials, applications. Vol.15, No.11 (2014), 2971-2981
Suggested Citation
Yotsarayuth Seekaew, Shongpun Lokavee, Ditsayut Phokharatkul, Anurat Wisitsoraat, Teerakiat Kerdcharoen, Chatchawal Wongchoosuk Low-cost and flexible printed graphene-PEDOT:PSS gas sensor for ammonia detection. Organic Electronics: physics, materials, applications. Vol.15, No.11 (2014), 2971-2981. doi:10.1016/j.orgel.2014.08.044 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/33663
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Title
Low-cost and flexible printed graphene-PEDOT:PSS gas sensor for ammonia detection
Abstract
© 2014 Elsevier B.V. All rights reserved. This work presents a simple, low-cost and practical inkjet-printing technique for fabricating an innovative flexible gas sensor made of graphene-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite film with high uniformity over a large area. An electronic ink prepared by graphene dispersion in PEDOT:PSS conducting polymer solution is inkjet-printed on a transparency substrate with prefabricated electrodes and investigated for ammonia (NH3) detection at room temperature. Transmission electron microscopy, Fourier transform infrared spectroscopy, UV-visible spectrometer and Raman characterizations confirm the presence of few-layer graphene in PEDOT:PSS polymer matrix and the present of π-π interactions between graphene and PEDOT:PSS. The ink-jet printed graphene-PEDOT:PSS gas sensor exhibits high response and high selectivity to NH3in a low concentration range of 25-1000 ppm at room temperature. The attained gas-sensing performance may be attributed to the increased specific surface area by graphene and enhanced interactions between the sensing film and NH3molecules via π electrons network. The NH3-sensing mechanisms of the flexible printed gas sensor based on chemisorbed oxygen interactions, direct charge transfers and swelling process are highlighted.