Gas Sensors Based on Deposited Single-Walled Carbon Nanotubes-Polypyrrole Networks for Ammonia Detection

Abstract:

In this work, we demonstrate excellent gas sensors based on single-walled carbon nanotubes (SWNTs)-polypyrrole (PPy) networks for the detection of ammonia (NH₃) gas. The SWNTs networks were deposited on oxidized silicon surface functionalized with 3-aminopropytrimethysilane. The Fe³⁺ ions were easily adsorbed on the surface of SWNTs by ion exchange process. After deposition of PPy molecules on the surface of SWNTs by chemical vapor polymerization process in a sealed container with pyrrole vapors, SWNTs-PPy networks were formed. By the combination of traditional silicon processes, SWNTs-PPy networks-based gas sensors were fabricated at a wafer scale. The sensitive properties of the resultant gas sensors for the detection of NH₃ gas were investigated at room temperature. And the results suggested that the gas sensors based on SWNTs-PPy networks exhibited excellent sensitivity to NH₃ gas. This new method is very simple, which holds great potential in the wide spread practical production.

• Periodical: Advanced Materials Research (Volume 815)
• Pages: 501-507
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.815.501
• Online since: October 2013
• Authors: Yan Yan Wang, Yan Hua Liu, Lei Yuan, Feng Zhang, Wei Zhang, Chen Rong, Da Yun Huo, Xian Ying Zhang, Chang Si Peng
• Keywords: Ammonia, Chemical Vapor Polymerization, Gas Sensor, Polypyrrole, Single-Walled Carbon Nanotubes

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