Hexagonal K2W4O13 nanorods have been synthesized by hydrothermal treatment of the WO3·H2O precipitate at 180 °C in the presence of K2SO4. The K2W4O13 nanorod single
crystals of ∼12 nm in diameter and tens to few hundreds nm long with the principal axis along the (001) direction were obtained when hydrothermal treatment was conducted in the presence of sufficient amount of K2SO4 while shorter nanorods with the same preferred orientation
were obtained when less amount of K2SO4 was employed. On the other hand, square platelets of ∼100 nm wide were obtained when prepared in the absence of the K2SO4. The important role of K2SO4 on morphological control of the
hydrothermal products was explained based on selective adsorption of the sulfate ions on the crystal planes parallel to the (001) direction retarding the growth of these faces. The nanorod film showed satisfactory electrochromic property and can be used as a promising material in electrochromic
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