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Hydrothermal synthesis of WO3·H2O nanoplates and their gas-sensing performance

The growth direction- and shape-controllable preparation of WO3·H2O is an existing challenge. This paper reports a facile approach for preparing WO3·H2O nanoplates in a solvent mixture of glycerol and water. It was determined that oleic acid has a dual function; that is, it provides a source of acid and guides the structure during the WO3·H2O growth. The structure and morphology of the samples were examined by XRD, SEM and TEM. We systematically explained the process and mechanism of WO3·H2O formation. Furthermore, the gas-sensing performance of stacked WO3·H2Onanoplates in various vapours (e.g. C2H5OH, C6H6, NH3 and HCOH) was investigated. The 2D-nanoplate architecture showed an excellent response to the detected gas. Moreover, WO3·H2O nanoplates exhibited a gas response of ∼25 in 35 ppm of ethanol gas. The new synthesis route and sensing performance of WO3·H2O nanoplates present a promising approach for developing efficient gas sensors.