Preparation method of fluorine-doped lamellar black titanium dioxide nano material

A method for preparing a fluorine-doped lamellar black TiO2 nanomaterials, the method comprising the steps of:

• adding 20˜30 mL of n-propanol into a beaker;
• adding 1˜3 mL of tetrabutyl titanate to said n-propanol so as to form a solution;
• stirring said solution;
• adding 0.2˜0.8 mL of hydrofluoric acid into said solution so as to form another solution;
• stirring said another solution for 1 to 3 hours;
• transferring said another solution to an autoclave at 160˜200° C. for 12˜24 hours so as to form a precipitate by a hydrothermal reaction;
• washing said precipitate with deionized water and ethanol so as to form a washed precipitate and a filtrate, until the filtrate is neutral;
• drying said washed precipitate so as to form a sample;
• and
• calcining said sample at 400˜450° C. in a protective atmosphere for a period of time so as to form the fluorine-doped lamellar black TiO2 nanomaterials with light absorption determined by both Ti3+surf and Ti3+sub-surf defects.