A molecular probe layer modified organic thin film transistor on flexible platform for next generation cyanide sensor |
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| Affiliation: | 1. State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China;2. Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan, 430072, PR China;3. Shenzhen Institute of Aggregate Science and Technology, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China;1. Department of Materials Science and Engineering, National Tsing Hua University, Hsin-Chu, 300, Taiwan;2. Center for Nanotechology, Materials Science, and Microsystems, National Tsing Hua University, Hsin-Chu, Taiwan, 300, Taiwan;3. Shine Materials Technology Co, Ltd, Taiwan;1. National Engineering Research Center for Nanomedicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Hubei Key Laboratory of Bioinorganic Chemistry and Materia Mediea, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China;1. Department of Chemistry and Chemical Engineering, Jining University, Qufu, China;2. The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China;1. Key Laboratory of Theoretical Organic Chemistry and Functional Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, PR China;2. College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, 411105, PR China;3. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, PR China;1. College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, PR China;2. Key Laboratory of Science and Technology on High-tech Polymer Materials, ICCAS, Beijing 100190, PR China |
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| Abstract: | Organic thin film transistor (OTFT) based cyanide (CN−) sensor can be of an intense interest due to its simple operation, high sensitivity, system on chip (SoC) integration capacity and applicability towards environmental safety. So, mechanical flexibility of such sensors can extend them to conformable, bio-compatible and wearable applications. In our recent work, a novel OTFT based highly sensitive and mechanically flexible platform was developed to detect CN− in aqueous medium. The sensor was fabricated on a flexible polyethylene terephthalate (PET) substrate by simple spin coating and operated at a very low voltage of −3 V. For the sensing element, a chemically active dansyl-dervatized-triazole linked glucopyranosyl conjugate (DTGC) was used as a molecular probe on the semiconducting poly (3-hexylthiophene) P3HT layer in the device structure. The fabricated sensor was characterized electrically while using an aqueous solution of tetrabutylammonium cyanide (TBAC) as an analyte. Significant changes in device characteristics including 0.4 V shift in threshold voltage, 0.2 cm2v−1s−1 increment in mobility and 2 μA increase in drain current were observed for the OTFT based sensor with presence of CN− analyte. The concentration of the CN− was then varied and thus the minimum detection limit was found to be 1 μM. The sensor also exhibited excellent mechanical flexibility with its stable operation even up to a bending with 5 mm of bending radius. The sensing mechanism of the developed sensor has been explained through the possible charge transfer phenomena from the host semiconductor due to a chemical reaction between the probe layer and the analyte. The sensititvity and chemical reactivity of the molecular probe to the CN− were further confirmed from the microscopic studies and the change in the visual appearance (colour) of the probe with the presence of aqueous CN−. |
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| Keywords: | Organic thin film transistor Sensor Cyanide Flexible device |
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