Titanium dioxide film synthesizing method and the product thereof

Abstract

A titanium dioxide films synthesizing method includes the step of coating a titanium film on the surface of a homogenous (or heterogeneous) substrate, and the step of using the titanium-coated substrate as anode in an electrolyte to synthesize an nano-structured titanium dioxide film with single anatase phase on the surface of the titanium film by employing electrochemical anodic oxidation at room temperature.

1 . A titanium dioxide film synthesizing method comprising the steps of: 
 coating a titanium film on a surface of a substrate, and    placing the titanium-coated substrate as anode in an electrolyte to synthesize an anatase phase of titanium dioxide film on a surface of said titanium film by employing electrochemical anodic oxidation.    
     
     
         2 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said substrate is selected from a group of materials including titanium, glass, ceramics, polymers, and semiconductor such as silicon.  
     
     
         3 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said titanium dioxide film is nano-structured.  
     
     
         4 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said titanium film is deposited on said substrate by sputtering.  
     
     
         5 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said titanium film is deposited on said substrate by evaporation.  
     
     
         6 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said electrolyte is a highly alkaline solution containing alkaline metal ions.  
     
     
         7 . The titanium dioxide film synthesizing method as claimed in  claim 6 , wherein said electrolyte is selected from one of potassium hydroxide (KOH) and sodium hydroxide (NaOH).  
     
     
         8 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein the concentration of said electrolyte is within 0.1˜10 M.  
     
     
         9 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said electrochemical anodic oxidation is performed by using a potentiodynamic mode at voltage ranging from 30 V to 75 V.  
     
     
         10 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said electrochemical anodic oxidation is performed by using a scanning electrolytic voltage mode at a scanning rate below 200 mV/s and a scanning cutoff voltage within 3 V to 85 V.  
     
     
         11 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said electrochemical anodic oxidation is performed for a period of time within 5 minutes to 10 hours.  
     
     
         12 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said electrochemical anodic oxidation is performed at a working temperature within 15° C.˜90° C.  
     
     
         13 . The titanium dioxide film synthesizing method as claimed in  claim 1 , wherein said electrolyte is highly acid solution such as sulfuric acid (H 2 SO 4 ).  
     
     
         14 . The titanium dioxide film synthesizing method as claimed in  claim 1 , further comprising the step of heating said anatase phase titanium dioxide film under atmospheric pressure for a predetermined length of time to transform said anatase phase titanium dioxide film to rutile phase titanium dioxide film.  
     
     
         15 . The titanium dioxide film synthesizing method as claimed in  claim 14 , wherein said anatase phase titanium dioxide film is heated at 500° C. for 2 hours.  
     
     
         16 . A titanium dioxide film with single anatase phase has a nano-network structure.  
     
     
         17 . The titanium dioxide film as claimed in  claim 16 , wherein an inner diameter of the network structure is ranging from 1˜200 nm.  
     
     
         18 . The titanium dioxide film as claimed in  claim 16  being formed on a surface of a titanium film.  
     
     
         19 . The titanium dioxide film as claimed in  claim 18 , wherein the titanium film is formed on a substrate.  
     
     
         20 . A titanium dioxide film synthesizing method comprising the step of placing a titanium substrate as anode in an electrolyte to synthesize an anatase phase of titanium dioxide film on a surface of said titanium substrate by employing electrochemical anodic oxidation.