Zinc Oxide/Polypyrrole particle-decorated rod structure for NO2 detection at low temperature

Vu Thanh Dong; Pham Tien Hung; Le Duc Anh; Ly Quoc Vuong; Dang Duy Khanh; Nguyen Thi Huong

doi:10.15625/2525-2518/18528

Author affiliations

Authors

Vu Thanh Dong https://orcid.org/0000-0003-1900-2949
Pham Tien Hung https://orcid.org/0000-0001-7486-5873
Le Duc Anh https://orcid.org/0000-0003-4954-620X
Ly Quoc Vuong
Dang Duy Khanh
Nguyen Thi Huong https://orcid.org/0000-0003-2716-936X

DOI:

https://doi.org/10.15625/2525-2518/18528

Keywords:

Green synthesis, NO2 gas sensor, ZnO, Conductive polymer, Low temperature

Abstract

In this study, Zinc oxide (ZnO) nanoparticles with a size of about 50 - 70 nm were green-synthesized using tea leaves and ZnO/Polypyrrole (ZnO/Ppy) nanocomposites were obtained by ultrasonic-assisted chemical polymerization method using pyrrole monomer and the nanoparticles. The characterization of the materials is conducted using several analytical techniques, including Field Emission Scanning Electron Microscopy (FESEM) and X-Ray Diffraction (XRD) and Ultraviolet visible spectrum (UV-Vis). The synthesized PPy material exhibits have a rod-shaped structure, diameter ranging from 100 to 200 nm. The ZnO/PPy nanocomposite system, consisting of PPy rods surrounded by ZnO particles. The gas sensing characteristics of the materials have also been investigated by measuring their sensitivity, response time, and stability to NO₂ at low temperature and different humidity. Notably, the material exhibits considerable sensitivity to NO₂ gas at low temperatures and the parameters related to response and recovery times are relatively rapid. Furthermore, a potential gas-sensing mechanism based on changes in the width of the depletion region is proposed.

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