Open AccessHigh-Performance PANI-Based Ammonia Gas Sensor Promoted by Surface Nanostructuralization
Author(s) -
Jinmei Liu,
Nuangyang Cui,
Qi Xu,
Zheng Wang,
Long Gu,
Wei Dou
Publication year - 2021
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/abe3ce
Subject(s) - polyaniline , materials science , x ray photoelectron spectroscopy , thin film , adsorption , etching (microfabrication) , chemical engineering , conductive polymer , polymerization , molecule , polymer , analytical chemistry (journal) , nanotechnology , composite material , organic chemistry , chemistry , layer (electronics) , engineering
In the area of conductive polymer-based sensors, polyaniline (PANI) has been widely studied for NH 3 gas detection and a lot of effort has been devoted to improving its sensing performance. In this work, PANI thin film was prepared by chemical oxidation polymerization and spinning coating approach. By further etching via reactive ion etching (RIE), a nanostructuralized PANI thin film was obtained. All of the morphology characterization, current-voltage (I–V) characteristics curves, and XPS analysis suggest that etching via RIE with O 2 gas could not only effectively increase the sensitive area and chemical diffusion pathway but also introduce extra oxygen-containing functional groups to adsorb more NH 3 molecules by hydrogen bond. The gas sensing performance of the PANI thin film sensor to NH 3 was examined. When the concentration of NH 3 gas increased from 3 ppm to 990 ppm, the response of pristine film-based PANI sensor increased from 1.07 to 1.48, while, the response of nanostructuralized film-based PANI sensor increased from 1.16 to 3.19. All the response, reproducibility, and selectivity to NH 3 results showed that the PANI sensor of nanostructuralized thin film to NH 3 was superior to the PANI sensor of pristine film. This work demonstrates a convenient and effective way that can be beneficially utilized for improving the gas sensing performance.