TECHNOLOGY FOCUS - ELECTRONICS - Preferred Method: The titanium dioxide film is nano-structured. The titanium film is deposited on the substrate by sputtering or by evaporation. The electrochemical anodic oxidation is performed using a potentiodynamic mode at a voltage of 30-75 V, or using a scanning electrolytic voltage mode at a scanning rate of below 200 mV/second and a scanning cutoff voltage of 3-85 V. It is performed for 5-10 hours. It is performed at a working temperature of 15-90degreesC. The titanium dioxide film synthesizing method further comprises heating the anatase phase titanium dioxide film under atmospheric pressure for a predetermined length of time to transform the anatase phase titanium dioxide film to rutile phase titanium dioxide film. The anatase phase titanium dioxide film is heated at 500degreesC for 2 hours. The titanium dioxide film is formed on a surface of a titanium film. The titanium film is formed on the substrate.Preferred Component: The titanium dioxide film with single anatase phase has a nano-network structure.Preferred Property: An inner diameter of the network structure is 1-200 nm.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The electrolyte is a highly alkaline solution containing alkaline metal ions, or a highly acid solution (e.g., sulfur acid (H2SO4). It is preferably one of potassium hydroxide (KOH) and sodium hydroxide (NaOH). The concentration of the electrolyte is 0.1-10 M. Preferred Material: The substrate is made from materials including titanium, glass, ceramics and semiconductor (e.g., silicon).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The electrolyte is a highly alkaline solution containing alkaline metal ions, or a highly acid solution (e.g., sulfur acid (H2SO4). It is preferably one of potassium hydroxide (KOH) and sodium hydroxide (NaOH). The concentration of the electrolyte is 0.1-10 M. Preferred Material: The substrate is made from materials including titanium, glass, ceramics and semiconductor (e.g., silicon).    TECHNOLOGY FOCUS - POLYMERS - Preferred Material: The substrate is made from polymers.