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Highly Sensitive Flexible NH3 Sensors Based on Printed Organic Transistors with Fluorinated Conjugated Polymers

Title
Highly Sensitive Flexible NH3 Sensors Based on Printed Organic Transistors with Fluorinated Conjugated Polymers
Authors
Nketia-Yawson, BenjaminJung, A-RaNoh, YohanRyu, Gi-SeongTabi, Grace DansoaLee, Kyung-KooKim, BongSooNoh, Yong-Young
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2017
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link
Citation
vol. 9, no. 8, pp. 7322 - 7330
Keywords
gas sensororganic thin film transistorsconjugated polymerprinting fluorination
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Understanding the sensing mechanism in organic chemical sensors is essential for improving the sensing performance such as detection limit, sensitivity, and other response/recovery time, selectivity, and reversibility for real applications. Here, we report a highly sensitive printed ammonia (NH3) gas sensor based on organic thin film transistors (OTFTs) with fluorinated difluorobenzothiadiazole-dithienosilole polymer (PDFDT). These sensors detected NH3 down to 1 ppm with high sensitivity (up to 56%) using bar-coated ultrathin (<4 nm) PDFDT layers without using any receptor additives. The sensing mechanism was confirmed by cyclic voltammetry, hydrogen/fluorine nuclear magnetic resonance, and UV/visible absorption spectroscopy. PDFDT-NH3 interactions comprise hydrogen bonds and electrostatic interactions between the PDFDT polymer backbone and NH3 gas molecules, thus lowering the highest occupied molecular orbital levels, leading to hole trapping in the OTFT sensors. Additionally, density functional theory calculations show that gaseous NH3 molecules are captured via cooperation of fluorine atoms and dithienosilole units in PDFDT. We verified that incorporation of functional groups that interact with a specific gas molecule in a conjugated polymer is a promising strategy for producing high-performance printed OTFT gas sensors.
DOI
10.1021/acsami.6b14220
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사범대학 > 과학교육과 > Journal papers
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