Rapid detection of low concentration CO using Pt-loaded ZnO nanosheets

Yan Wang; Xiao-Ning Meng; Jian-Liang Cao

doi:10.1016/j.jhazmat.2019.120944

Rapid detection of low concentration CO using Pt-loaded ZnO nanosheets

J Hazard Mater. 2020 Jan 5:381:120944. doi: 10.1016/j.jhazmat.2019.120944. Epub 2019 Jul 30.

Authors

Yan Wang¹, Xiao-Ning Meng¹, Jian-Liang Cao²

Affiliations

¹ The Collaboration Innovation Center of Coal Safety Production of Henan Province, College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, PR China.
² College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, PR China. Electronic address: caojianliang@hpu.edu.cn.

PMID: 31382132
DOI: 10.1016/j.jhazmat.2019.120944

Abstract

Unloaded and Pt-loaded ZnO nanosheets with 120-170 nm sizes were successfully synthesized by a facile one-pot hydrothermal route followed by a calcination treatment. The as-synthesized samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It can be clearly observed that Pt nanoparticles with the diameter of 3-5 nm were uniformly loaded on the surface of ZnO nanosheets. A contrastive study based on CO gas sensing performance of bare ZnO and Pt/ZnO was carried out. According to the measurement results, the loading of Pt remarkably upgraded the sensing capability toward CO. The 0.50 at.% Pt/ZnO based gas sensor exhibited an obvious response value of 3.57 toward 50 ppm CO and fast response/recovery time (6/19 s). Besides, the detection limit was as low as 0.10 ppm and the optimal operating temperature was decreased from 210 °C to 180 °C. The enhanced CO sensing performance by Pt nanoparticles could be attributed to the combination of chemical sensitization and electronic sensitization. The 0.50 at.% Pt/ZnO is an efficient sensor material for rapidly detecting low-concentration CO.

Keywords: Carbon monoxide; Fast response/recovery time; Gas sensor; Low detection limit; Pt/ZnO nanosheets.

Publication types

Research Support, Non-U.S. Gov't