Gas Sensing Properties and Mechanism of Nano-SnO2-Based Sensor for Hydrogen and Carbon Monoxide. (4th December 2012)

• Record Type: Journal Article
• Authors: Chen, Weigen; Zhou, Qu; Wan, Fu; Gao, Tuoyu
• Other Names: Zeng Wen Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2012(2012)
• Publication Date: 2012-12-04
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2012/612420
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : Nano-SnO2 powder was prepared by the hydrothermal method in this paper. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the composition of the crystalline phase and the morphology of the prepared gas-sensitive materials, respectively. In particular, the study focused on the sensing behaviors of nano-SnO2 -based sensor towards power transformer fault gases such as hydrogen and carbon monoxide. The optimum working temperature for hydrogen and carbon monoxide is about 400 ∘ C and 360 ∘ C, separately. Further investigations into the adsorption process of gas molecule on SnO2 (110) surface based on the first principles were conducted. The calculations indicated that 1 σ orbits of H2 split into several new electronic peaks and 5 σ orbits of CO almost degenerated completely in the adsorption process, which promoted charge transfer between gas molecule and SnO2 (110) surface. It provides a qualitative explanation for the prepared nano-SnO2 -based sensor exhibiting different gas sensing properties towards H2 and CO.