AUTHOR=Zhu Chonghui , Cheng Xiaoli , Dong Xin , Xu Ying ming 

TITLE=Enhanced Sub-ppm NH3 Gas Sensing Performance of PANI/TiO2 Nanocomposites at Room Temperature

JOURNAL=Frontiers in Chemistry

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00493

DOI=10.3389/fchem.2018.00493

ISSN=2296-2646

ABSTRACT=<p>PANI/TiO<sub>2</sub> nanocomposites spheres were synthesized using a simple and efficient one-step hydrothermal process. The morphology and structure of PANI/TiO<sub>2</sub> nanocomposites spheres were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The PANI/TiO<sub>2</sub> nanocomposite sphere-based sensor exhibits good selectivity, sensitivity (5.4 to 100 ppm), repeatability, long-term stability and low detection limit (0.5 ppm) to ammonia at room temperature (20 ± 5°C). It also shows a good linearity relationship in the range of 0.5–5 and 5–100 ppm. The excellent NH<sub>3</sub> sensing performance is mainly due to the formation of the p-n heterostructure in the nanocomposites.</p>