Fabrication methods of organic thin film transistor for volatile organic compounds gas sensor
The chapter reveals the development of organic thin films transistor (OTFT) as a gas sensor. The OTFT inherits the design architecture from its inorganic counterpart known as Field Effect Transistor (FET). The three main components of a FET are source, drain and gate electrodes. For a FET, a dielect...
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| Main Authors: | , , |
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| Format: | Book Section |
| Language: | English |
| Published: |
Penerbit Uthm
2019
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/3564/1/c%203%20DONE.pdf http://eprints.uthm.edu.my/3564/ |
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| Summary: | The chapter reveals the development of organic thin films transistor (OTFT) as a gas sensor. The OTFT inherits the design architecture from its inorganic counterpart known as Field Effect Transistor (FET). The three main components of a FET are source, drain and gate electrodes. For a FET, a dielectric layer or known as insulator will be placed on the bottom of active semiconductor layer. In this study, the OTFT will be designed with an organic material namely Poly (3-hexythiophene-2,5-diyl) regioregular (P3HT) as an active material. Currently, metallic oxides such as Titanium Dioxide (TiO2) and Zinc Oxide (ZnO) are commonly used in making gas sensor because of their sensitivity and conductivity upon gas reaction and absorption. But, the disadvantages of these materials are at the requirement to operate at elevated temperature at a higher cost, therefore limiting their use in some applications. Thus, an organic material such as PH3T was chosen to be employed in gas sensor because its ability to use small energetic input and functional at room temperature. In general, the fabrication processes of OTFT device almost similar with the inorganic type. However, the main attractions of this processes is that all the layers of an OTFT can be deposited and patterned at room temperature by a combination of low-cost solution-processing and direct-write printing. Thus, it makes them ideally suited for realization of low-cost and large-area electronic functions on flexible substrates. This chapter reveals the proposal of using OTFT for sensing volatile organic compounds (VOCs) gas that are such as benzene, chloroform, toluene and xylene. VOCs are permissible in small dose, but it can be neurotoxin to human and animal if exposed to higher dosage. The higher dose of VOCs can cause disease symptoms like drowsiness, headache, tremor and memory loss. In comparison with OTFT, the inorganic material namely Zinc Oxide (ZnO) which has higher carrier mobility was blended with the conjugated polymer P3HT and formed a new sensing material in active layer to enhance the performance of transistor. |
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