Fast ozone detection by using a core-shell Au@TiO2 sensor at room temperature

This paper reports on the use of Au@TiO2 core-shell material for sensing ozone gas. The material (i.e., Au@TiO2 nanoparticles) was characterized using X-ray diffraction, transmission electron microscopy, ultraviolet-visible spectra, and energy-dispersive X-ray spectroscopy. The sensor responded to sub-ppm levels of ozone, and Au@TiO2 exhibited a rapid response time of 3s and a recovery time of 20s under ambient light at room temperature. The Au@TiO2 was suitable for detecting low-concentration ozone gas with a fast response. Furthermore, the Au@TiO2 sensor exhibited high selectivity, satisfactory reproducibility, and excellent long-term stability for ozone gas. Therefore, core-shell Au@TiO2 is a promising sensing material for application in ozone sensing. (C) 2015 Elsevier B.V. All rights reserved.