Abstract
The fine particles of tetragonal KxWO3 and cubic NaxWO3 were successfully synthesized by reducing WO42− with BH4− in aqueous solutions, followed by the crystallization of amorphous precursors by calcination under N2, NH3 and H2 (5 vol%)/N2 atmospheres at 600°C for 1 h, respectively. The products showed excellent electrical conductivity, visible light transparency, and near‐infrared light shielding characteristics, where the samples crystallized in H2 (5 vol%)/N2 mixed gas showed the highest electric conductivity being superior to commercial conductive oxide ITO. Meanwhile, the samples showed strong absorption of near‐infrared light and instantaneous conversion of photo‐energy to local heat. The effects of crystallization atmosphere on the near‐infrared absorbtion and electroconductivity properties of KxWO3 and NaxWO3 are discussed in detail.
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