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Sensors (Basel)

Title:		Detection of Water Contaminants by Organic Transistors as Gas Sensors in a Bottom-Gate/Bottom-Contact Cross-Linked Structure
Author(s):		Izquierdo JEE; Cavallari MR; Garcia DC; Oliveira J; Nogueira VAM; Braga GS; Ando Junior OH; Quivy AA; Kymissis I; Fonseca FJ;
Address:		"Departamento de Engenharia de Sistemas Eletronicos (PSI), Escola Politecnica da Universidade de Sao Paulo (EPUSP), Sao Paulo 05508-010, SP, Brazil. School of Electrical and Computer Engineering, University of Campinas (Unicamp), Av. Albert Einstein 400, Campinas 13083-852, SP, Brazil. Electrical Engineering Department, Columbia University, New York, NY 10027, USA. Institute for Systems and Computer Engineering, Technology and Science (INESC TEC), 4200-465 Porto, Portugal. Research Group on Energy & Energy Sustainability (GPEnSE), Academic Unit of Cabo de Santo Agostinho (UACSA), Federal Rural University of Pernambuco (UFRPE), Cabo de Santo Agostinho 54518-430, PE, Brazil. Institute of Physics, University of Sao Paulo, Sao Paulo 05508-090, SP, Brazil"
Journal Title:		Sensors (Basel)
Year:		2023
Volume:		20230920
Issue:		18
Page Number:		-
DOI:		10.3390/s23187981
ISSN/ISBN:		1424-8220 (Electronic) 1424-8220 (Linking)
Abstract:		"Detecting volatile organic compounds is a fundamental step in water quality analysis. Methylisoborneol (MIB) provides a lousy odor to water, whereas geosmin (GEO) is responsible for its sour taste. A widely-used technique for their detection is gas-phase chromatography. On the other hand, an electronic nose from organic thin-film transistors is a cheaper and faster alternative. Poly(2,5-bis(3-tetradecyl-thiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-C14) features semiconducting properties suitable for organic electronics. However, in order to expose the active layer in a bottom-gate transistor structure with photolithographically patterned electrodes, a cross-linked dielectric such as poly(4-vinyl phenol) (PVP) is necessary. In this work, the cross-linking was demonstrated using FTIR and Raman spectroscopies, as well as high-k capacitors with a dielectric constant of 5.3. The presence of enhanced crystallinity with terrace formation in the semiconducting film was confirmed with UV-visible spectrophotometry, atomic force microscopy, and X-ray diffraction. Finally, for the first time, a PBTTT-C14 transistor on cross-linked PVP was shown to respond to isoborneol with a sensitivity of up to 6% change in mobility per ppm. Due to its similarity to MIB, a system comprising these sensors must be investigated in the future as a tool for sanitation companies in real-time water quality monitoring"
Keywords:		Pbttt-c14 electronic nose gas sensors organic electronics organic semiconductors organic thin-film transistors;
Notes:		"PublisherIzquierdo, Jose Enrique Eirez Cavallari, Marco Roberto Garcia, Dennis Cabrera Oliveira, Jose Diogo da Silva Nogueira, Vinicius Augusto Machado Braga, Guilherme de Souza Ando Junior, Oswaldo Hideo Quivy, Alain A Kymissis, Ioannis Fonseca, Fernando Josepetti eng CAPES, scholarship number 88882.333362/2019-01, Programa de Excelencia Academica/PROEX/Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior/ FAPESP, process numbers 13/50440-7, 580 13/19420-0, and 15/08566-9/Sao Paulo Research Foundation/ Unicamp, Auxilio Inicio de Carreira (Docente), FAEPEX, process number 2095/23/State University of Campinas/ FACEPE, process numbers APQ-0616-9.25/21 and APQ-0642-9.25/22/Fundacao de Amparo a Ciencia e Tecnologia do Estado de Pernambuco/ CNPq, process numbers 311687/2017-2, 608 407531/2018-1, 303293/2020-9, 309837/2021-9, 405385/2022-6, 405350/2022-8, and 40666/2022-3/National Council for Scientific and Technological Development/ Switzerland 2023/09/28 Sensors (Basel). 2023 Sep 20; 23(18):7981. doi: 10.3390/s23187981"