Titanium dioxide film synthesizing method and the product thereof

• US 20050103639A1
• Filed: 11/18/2003
• Published: 05/19/2005
• Est. Priority Date: 11/18/2003
• Status: Abandoned Application

• Current Assignee: Fu-Hsing Lu, Yu-Shao Yang
• Original Assignee: Fu-Hsing Lu, Yu-Shao Yang
• Inventors: Yang, Yu-Shao, Lu, Fu-Hsing
• Application Number:
  US10/714,856
• Publication Number:
  US 20050103639A1
• Time in Patent Office: Days
• US Class Current: 205/322
• CPC Class Codes: C25D 11/26 of refractory metals or alloys based thereon

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.

Claims

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 (H₂SO₄).

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.