Journal of Inorganic Materials ›› 2024, Vol. 39 ›› Issue (11): 1245-1253.DOI: 10.15541/jim20240218

• RESEARCH ARTICLE • Previous Articles     Next Articles

Monitoring Ammonia at Room Temperature of p-Aminobenzene Sulfonic Acid Modified MoO3/PPy Composites

DING Ningning1,2(), SUN Jianhua1,2, WEI Xu1,2, SUN Lixia1,2()   

  1. 1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
    2. Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Nanning 530004, China
  • Received:2024-04-26 Revised:2024-06-24 Published:2024-11-20 Online:2024-07-16
  • Contact: SUN Lixia, associate professor. E-mail: binglin0628@163.com
  • About author:DING Ningning (1997-), female, Master candidate. E-mail: dingning1585@163.com
  • Supported by:
    National Natural Science Foundation of China(22165001);National Natural Science Foundation of China(52002088);Guangxi Natural Science Foundation Project(2018GXNSFAA294001)

Abstract:

Ammonia is a harmful atmospheric pollutant that poses serious threats to human health and ecological environment. Therefore, the development of low-energy, high-performance and real-time ammonia monitoring system is imperative. In this study, p-aminobenzene sulfonic acid (pABSA) modified MoO3/polypyrrole (PPy) composite materials were successfully prepared using an in situ chemical oxidation polymerization method with MoO3 and pyrrole monomer (Py) as raw materials and FeCl3 as an oxidant, along with pABSA as an anionic surfactant. Microstructure of the materials was characterized to explore influence of pABSA-modified MoO3/PPy composite materials on the gas sensing performance. The results demonstrate that at room temperature, the response value of pABSA-modified MoO3/PPy composite material to a mass concentration of 1×105 µg/L ammonia is 188%, which is ~8 times higher than that of pure PPy (22%), exhibiting excellent selectivity and stability. The enhancement in sensing performance can be attributed to the formation of a heterojunction between MoO3 and PPy as well as surface modification by pABSA leading to increased mobile charge carriers on the material's surface.

Key words: polypyrrole, MoO3, p-aminobenzene sulfonic acid, ammonia, gas sensitivity, charge transport

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