Preparation and Gas Sensitivity of Two-Dimensional Tungsten Oxide Supported High Density Gold Nanoparticles

Abstract

Nano-noble metal materials loaded metal oxide greatly reduce application costs, improve catalytic performance and sensing efficiency compared with oxide substrates. A simple and efficient load method plays an important role in promoting its commercialization. Nano-tungsten oxide is a kind of excellent gas sensing materials and it had been widely used. Noble metal loading can form abundant active centers on the surface of tungsten oxide and become an effective way to improve its gas detecting performance. The complexity and high cost of the loading methods hinder the its application and commercialization on supported catalysts. In this paper, Au/WO_2.6 composites with high loading rate were prepared on layered tungsten oxide nano-flakes by a simple and low-cost method. The gas sensitivity of WO_2.6 to ethanol and formaldehyde without Au and with Au were tested. The results show that the loading rate is the highest after reaction for 24 hours. The gas sensitivity of Au loaded WO_2.6 is significantly improved. The sensitive mechanism on Au/WO_2.6 composite were discussed in our work.