Visible light-assisted room temperature gas sensing with ZnO-Ag heterostructure nanoparticles

A gas sensor based on ZnO-Ag nanoparticles is successfully developed for visible light-assisted gas detection. Because a heterojunction forms between the two materials and surface oxygen vacancies increase, the sensor exhibits excellent sensing performances toward NO2 gas at room temperature under light illumination. The optimal sensitivity can be obtained by tuning the working wavelength using different LED light sources.