Effect of platinum on the sensing performance of ZnO nanocluster to CO gas. (August 2020)

• Record Type: Journal Article
• Authors: Jigang, Wang; Ji, Li; Yong, Duan; Yan, Zhang; Lihui, Meng; Asadi, Hamid
• Is Part Of: Solid state communications. Volume 316/317(2020)
• Publication Date: 2020-08
• Subjects: A. Sensor -- A. Zn12O12 nanocluster -- D. Electronic properties -- E. Density functional theory; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2020.113954
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: An experimental report showed that Pt-decoration significantly increased the ZnO nanostructure sensitivity toward carbon monoxide (CO) gas. We performed DFT calculations to reveal the origin of this phenomenon. The Pt atom catalyzes the air O2 dissociation, which can interact with CO gas to form CO2 gas. This affects electronic resistance and leads to production of an electrical signal. These issues are discussed in terms of orbital, density of states, electronic, energetic, and charge transfers. We predicted a short recovery time of 0.18 μs and a sensor response of 5. Highlights: CO weakly interacts with the ZnO and cannot be detected electronically. A Pt decoration significantly increases the sensitivity of ZnO to CO gas. The Pt–ZnO sensor response or recovery time is 5 or 0.17 μs. Pt–ZnO is also a promising work function-type sensor for CO gas.