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Heterostructured TiO 2 /WO 3 porous microspheres with W/Ti molar ratio of 2, 4, and 10% (TW-2, TW-4, TW-10, respectively) were prepared by ultrasonic spray pyrolysis of aqueous suspension of Degussa P25 particles containing ammonium tungstate. Crystal phase evolution of WO 3 from amorphous to orthorhombic was observed with the increase of its content. TiO 2 /WO ...
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