As for the Cs-doped WO3, the superconductivity of CsxWO3 prepared by reported that CsxWO3 with 0.3 ≥ x ≥ 0.19 was a 3D superconductor, a transition from a metal to an insulator occurs at x < 0.19, and a 2D superconductor was formed at x=0.05. In addition to, the hexagonal tungsten bronze phase of Cs0.33WO3 was regarded as being highly attractive in solar filter applications because of its strong absorption in the NIR wavelengths.

 

The traditional methods for preparing the hexagonal tungsten bronze CsxWO3 usually require high temperature and harsh reaction conditions, such as heating mixtures of WO3 with K, Rb or Cs salts in reducing atmospheres at 1000 ℃. Recently, morphology and phase control of particles by soft chemical synthesis methods have attracted wide interest in the synthesis of many oxides such as ZnO, WO3, etc. It has been acknowledged that the microstructure and morphology of particles play an important role in its properties. Up to now, synthesizing pure WO3 with different morphologies and properties has been widely reported. However, there is limited work reported on the synthesis and characterization of CsxWO3 with controlled morphology by solvothermal reaction. Furthermore, the effects of ammonia annealing on the heat-shielding properties of CsxWO3 have not been reported.