Abstract
In this study, the ethanol-sensing characteristics of Ag@TiO2 nanoparticles were investigated. The morphology, structure, and formation mechanism of the Ag@TiO2 core–shell nanoparticles were carefully studied using X-ray diffraction, transmission electron microscopy, ultraviolet–visible spectroscopy, ZetaSizer Nano ZS and energy-dispersive X-ray spectroscopy. A gas sensing study showed that Ag@TiO2 is a promising sensor for detecting ethanol gas at low concentrations (below 5ppm) at room working temperature. Ag@TiO2 exhibited a sensor response of 1.04–4.35 at the ethanol concentration from 0.15ppm to 5ppm. In addition, the sensor presented an excellent selectivity and stability for ethanol gas. This systematic study of the promising ethanol-sensing characteristics of Ag@TiO2 nanoparticles can facilitate the development of sensors that detect ethanol gas.
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