Tungsten oxide and Zinc Oxide Using

Tungsten oxide and Zinc oxide used as important functional materials have been widely applied into chromic devices, microsensors, surface acoustic wave (SAW)devices and microfluidic devices. Based on the nanotechnology and advanceddeposition techniques, highly functionalized films with good crystallinity could be grown under the optimized conditions, which have a vital significance on the improvement of the performance of the devices. The tungsten oxide nanocrystals withnovel microstructures have been controllably synthesized assisted by the dual-functional reagents. The sputtered ZnO films have been used to fabricate the SAW devices using the microelectromechanical systems technology, and the high-performance SAW devices have been successfully applied into the sensors and microfluidics.

Hexagonal tungsten oxide nanocrystals with microplate, urchin-like, and microspherical morphologies have been hydrothermally synthesized using ammoniumtartrate (AT). The spherical microstructure changed to a microplate one and the crystalphase was partially transferred from hexagonal WO3 to orthorhombic WO3 when the pH value was reduced from 1.08 to 0.6. Besides the adsorption action of the NH4+ and Na+ ions, the capping effect was reinforced by the hydrogen bonding from the tartrate groups with the increase in the concentration of AT. The optical analysis indicated that the bandgap increased with the decrease in the diameter of the hex-WO3 nanocrystals. The enhancement of the blue emission of the nanocrystals originates from the local intercalation of the Na+ ions and the oxygen defects.

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