@ARTICLE{10.3389/fchem.2018.00493, AUTHOR={Zhu, Chonghui and Cheng, Xiaoli and Dong, Xin and 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/articles/10.3389/fchem.2018.00493}, DOI={10.3389/fchem.2018.00493}, ISSN={2296-2646}, ABSTRACT={PANI/TiO2 nanocomposites spheres were synthesized using a simple and efficient one-step hydrothermal process. The morphology and structure of PANI/TiO2 nanocomposites spheres were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The PANI/TiO2 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 NH3 sensing performance is mainly due to the formation of the p-n heterostructure in the nanocomposites.} }