TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: In the method: the amount of the polymer binder is 0.5-50 parts by weight based on 100 parts by weight of the mesoporous titanium dioxide particles; and the amount of the acid is 50-500 parts by weight based on 100 parts by weight of the mesoporous titanium dioxide particles. The titanium dioxide precursor comprises titanium ethoxide, titanium isopropoxide, titanium chloride and/or titanium methoxide. The amount of the acid in the titanium dioxide precursor mixture is 30-500 parts by weight based on 100 parts by weight of the mesoporous silica. The amount of the titanium dioxide precursor is 50-120 parts by weight based on 100 parts by weight of the mesoporous silica. The metal oxide comprises titanium dioxide, zirconium oxide, strontium oxide, zinc oxide, lanthanum oxide, vanadium oxide, molybdenum oxide, tungsten oxide, tin oxide, niobium oxide, magnesium oxide, aluminum oxide, yttrium oxide, scandium oxide, samarium oxide, gallium oxide and/or strontium titanium oxide.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: Mesopores of the mesoporous titanium dioxide particles have: a distance between the mesopores of 4-15 nm; an average pore diameter of 2-7 nm; and a pore volume of 0.03-0.08 cc/g. The mesoporous titanium dioxide particles has X-ray diffraction peak as given in the specification. The dye sensitized solar cell further comprises a porous membrane having a metal oxide between the first electrode and the photoelectrode. Preferred Method: In the method, the heat treatment is performed at 400-550 degrees C. In the method, the mesoporous titanium dioxide particles are prepared by: preparing a titanium dioxide precursor mixture by mixing a titanium dioxide precursor, an acid, and a solvent; impregnating mesoporous silica with the titanium dioxide precursor mixture and drying and heat treating the resultant; and removing the mesoporous silica from the heat-treated resultant. In the method of preparing mesoporous titanium dioxide particles: the drying is performed at 80-160 degrees C; the heat treatment is performed at 400-550 degrees C; and the mesoporous silica is removed using a sodium hydroxide solution.