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 3 s and a recovery time of 20 s 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.

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