Method for manufacture of transition metal oxide fine particles

A method for manufacture of transition metal oxide fine particles, the method comprising:

• heating a strong alkaline aqueous solution while stirring;
• adding a transition metal oxide to the heated strong alkaline aqueous solution to dissolve the transition metal oxide in the strong alkaline aqueous solution;
• adding a strong acid aqueous solution to the strong alkaline aqueous solution in which the transition metal oxide is dissolved while stirring to re-dissolve a solid material formed at an interface between the strong alkaline aqueous solution and the strong acid aqueous solution;
• adjusting the pH of a mixed aqueous solution of the strong alkaline aqueous solution and the strong acid aqueous solution by controlling speed and amount of adding the strong acid aqueous solution to precipitate transition metal oxide fine particles;
• and
• separating the transition metal oxide fine particles from the mixed aqueous solution and sequentially washing, drying, and heating the separated transition metal oxide fine particles,
• wherein the transition metal oxide includes molybdenum trioxide and tungsten trioxide,
• wherein the dissolving of the transition metal oxide in the strong alkaline aqueous solution is performed to sequentially dissolve molybdenum trioxide and tungsten trioxide in the strong alkaline aqueous solution.