Improved acetone gas sensing performance based on optimization of a transition metal doped WO3 system at room temperature. (1st February 2021)

• Record Type: Journal Article
• Authors: Pi, Mingyu; Zheng, Liyu; Luo, Haoyue; Duan, Simiao; Li, Chenlu; Yang, Jie; Zhang, Dingke; Chen, Shijian
• Is Part Of: Journal of physics. Volume 54:Number 15(2021)
• Publication Date: 2021-02-01
• Subjects: WO3 -- transition metal doping -- photo-gas sensitive properties -- exhaled gas markers -- acetone; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abd8f0
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: This paper proposes an effective strategy of material system optimization to improve acetone gas sensing performance based on hydrothermally processed transition metal (Fe, Co or Ni)-doped WO3 materials. A detailed comparison of the capability of pure WO3 and X:WO3 (X = Fe, Co, Ni) to sense acetone gas at room temperature was performed. It was found that the sensitivity of Ni:WO3 nanoflowers to acetone was much higher than that of pure WO3, Fe:WO3 and Co:WO3 under white light irradiation. To obtain a highly sensitive acetone gas sensor, the molar doping ratio of Ni to WO3 was further optimized. It was found that 3%Ni:WO3 had the highest response–recovery speed and the best target gas selectivity. Acetone with a concentration as low as 2 ppm can be detected at room temperature (20 °C). The sensitivity enhancement mechanism of the Ni:WO3 gas sensor is also discussed. It is expected that under white light irradiation the proposed Ni-doped WO3 can be used as a highly sensitive and selective acetone gas sensor at room temperature.