Synthesis and Gas Sensing Properties of Au@In2O3 Core-shell Nanoparticles

The interest in hybrid nanoparticles (NPs) arises from their combined and often synergetic properties exceeding the functionality of the individual components. Herein, a general, environmentally friendly, and facile hydrothermal approach to synthesize the metal-semiconductor, Au@In2O3 core-shell heteronanostructures is described. These Au@In2O3 core-shell NPs are used as chemiresistive gas sensors for the detection of gases such H2, CO, NO2, VOCs in air. Sensor device based on Au@In2O3 core-shell NPs showed greater response than that of In2O3 NPs sensor device. The enhanced activity can be attributed to the catalytic effect of Au, and synergistic interactions between the Au and In2O3 NPs formed into the core-shell heteronanostructures in such a way that favors the efficient electron transfer at the interface