Hydrothermal synthesis of WO3 center dot H2O with different nanostructures from 0D to 3D and their gas sensing properties

摘要

In this paper, WO3 center dot H2O with different nanostructures from 0D to 3D were successfully synthesized via a simple yet cost-effective hydrothermal method with the assistance of surfactants. The structures and morphologies of products were investigated by XRD and SEM. Besides, we systematically explained the evolution process and formation mechanisms of different WO3 center dot H2O morphologies. It is noted that both the kinds and amounts of surfactants strongly affect the formation of WO3 center dot H2O crystals, as reflected in the tailoring of WO3 center dot H2O morphologies. Furthermore, the gas sensing performance of the as-prepared samples towards methanol was also investigated. 3D flower-like hierarchical architecture displayed outstanding response to target gas among the four samples. We hoped our results could be of great benefit to further investigations of synthesizing different dimensional WO3 center dot H2O nanostructures and their gas sensing applications. (C) 2015 Published by Elsevier B.V.