Au nanoparticles modified MoO_3 nanosheets with their enhanced properties for gas sensing

摘要

Two-dimensional nanostructures with controlled morphology and dimensionality make them a promising candidate for high-performance sensing materials. Meanwhile, surface modification with noble metals is considered as an effective strategy to enhance gas sensing performance of metal oxide-based gas sensors. In this work, a novel gas sensing material was synthesized by decorating Au nanoparticles on molybdenum oxide nanosheets. The morphology and structure of the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The hexagonal MoO_3 nanosheets are about 600 nm in diameter, and the scale of Au nanoparticles are around 10-15 nm. Furthermore, owing to the composite structure, the sensor based on Au@MoO_3 nanocomposites showed superior gas sensing performance towards ethanol and it may have potential applications in the detection of ethanol vapors.