Thin film transistors based on single-walled carbon nanotubes-polyethylenimine bilayer film for NO2 gas detection

Tao Xie; Guangzhong Xie; Yong Zhou; Junlong Huang; Huiling Tai

doi:10.1117/12.2069584

21 August 2014 Thin film transistors based on single-walled carbon nanotubes-polyethylenimine bilayer film for NO₂ gas detection

Tao Xie, Guangzhong Xie, Yong Zhou, Junlong Huang, Huiling Tai

Author Affiliations +

Proceedings Volume 9285, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials for Manufacturing and Testing; 92850A (2014) https://doi.org/10.1117/12.2069584
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

In this paper, bottom contact organic thin film transistors (OTFTs) using SiO₂ dielectric layer deposited on silicon wafer were fabricated for gas sensors application. Single-walled carbon nanotubes (SWNTs)- polyethylenimine(PEI) bilayer sensitive film was utilized as an active layer to test current-voltage characteristics and gas-sensing properties of the OTFT device. Due to PEI coating, the electronic characteristic of the active layer was turned from p-type (SWNTs film) into n-type (SWNTs-PEI bilayer film). When the gas sensor was exposed to NO₂ of different concentrations at room temperature, the source-drain current changed within several minutes at appropriate gate and source-drain voltages. The selectivity and repeatability of gas sensor were investigated as well. The results showed that the gas sensor exhibited outstanding properties to NO₂ gas. Moreover, the gas sensing mechanism of the sensitive film associated with the morphology analyzed by scanning electron microscope (SEM) was studied.

Citation Download Citation

Tao Xie, Guangzhong Xie, Yong Zhou, Junlong Huang, and Huiling Tai "Thin film transistors based on single-walled carbon nanotubes-polyethylenimine bilayer film for NO₂ gas detection", Proc. SPIE 9285, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials for Manufacturing and Testing, 92850A (21 August 2014); https://doi.org/10.1117/12.2069584

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