Sulfur dioxide gas sensing at room temperature based on tin selenium/tin dioxide hybrid prepared via hydrothermal and su
- PDF / 1,897,841 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 35 Downloads / 197 Views
RARE METALS
ORIGINAL ARTICLE
Sulfur dioxide gas sensing at room temperature based on tin selenium/tin dioxide hybrid prepared via hydrothermal and surface oxidation treatment Qian-Nan Pan, Zhi-Min Yang, Wei-Wei Wang, Dong-Zhi Zhang*
Received: 14 June 2020 / Revised: 26 July 2020 / Accepted: 13 August 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In this paper, a novel SnSe/SnO2 nanoparticles (NPs) composite has been successfully fabricated through hydrothermal method and surface oxidation treatment. The as-prepared sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). A series of morphological and structural characteristics confirm that the SnSe/SnO2 NPs composite shows a core–shell structure with a SnO2 shell with thickness of 6 nm. The prepared SnO2 NPs and SnSe/ SnO2 NPs composite were applied as gas-sensing materials, and their gas-sensing properties were investigated at room temperature systematically. Experimental results show that the response value of the SnSe/SnO2 composite sensor toward 100 9 10–6 SO2 is 15.15%, which is 1.32 times higher than that of pristine SnSe (11.43%). And the SnSe/SnO2 composite sensor also has a detection limit as low as 74 9 10–9 and an ultra-fast response speed. The enhanced gas-sensing performance is attributed to the formation of p–n heterojunction between SnSe and SnO2 and the appropriate SnO2 shell thickness. Keywords SO2 gas sensor; Room temperature detection; Core–shell structure; SnSe/SnO2 composite; Debye length
1 Introduction Sulfur dioxide (SO2), as a colorless, extremely toxic, and highly irritating gas, is one of the main indicators of air Q.-N. Pan, Z.-M. Yang, W.-W. Wang, D.-Z. Zhang* College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China e-mail: [email protected]
pollution [1, 2]. It is well known that SO2 is oxidized to SO3 and will form acid rain when combining with water and the acid rain will reduce soil fertility, cause skin irritation and ulcers, and damage the buildings and environment [3, 4]. Additionally, SO2 gas is a serious threat to human health, inhalation of low concentrations of SO2 gas can cause respiratory diseases including bronchitis, asthma, and even death [5]. The Occupational Safety and Health Administration (OSHA) reported the human-permissible exposure limit for SO2 is 5 9 10–6 and the long-term exposure limit is 2 9 10–6 [6]. The development of miniature, portable, efficient, and reliable gas sensors can help reflect the composition and concentration of atmospheric environmental gaseous pollutants in real time and can also help people to deal with dangerous gases in a timely manner. Therefore, developing SO2 gas sensors is a necessary mean to ensure environmental monitoring, social safety, and human health. At present, compared with high-precision instrument analysis technologies such as infr
Data Loading...
