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

被引：139
作者：
Wang, Yan [1 ]
Meng, Xiao-ning [1 ]
Cao, Jian-liang [2 ]
机构：
[1] Henan Polytech Univ, Coll Safety Sci & Engn, Collaborat Innovat Ctr Coal Safety Prod Henan Pro, Jiaozuo 454000, Henan, Peoples R China
[2] Henan Polytech Univ, Coll Chem & Chem Engn, Jiaozuo 454000, Henan, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2020年 / 381卷
基金：
中国国家自然科学基金;
关键词：
Pt/ZnO nanosheets; Carbon monoxide; Gas sensor; Fast response/recovery time; Low detection limit; SENSITIVE ELECTROCHEMICAL SENSOR; GAS-SENSING PROPERTIES; DOPED ZNO; PD; AU; NANOCOMPOSITE; TEMPERATURE; FABRICATION; NANOSTRUCTURES; PERFORMANCE;
D O I：
10.1016/j.jhazmat.2019.120944
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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 degrees C to 180 degrees 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.
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页数：9
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