Visible-light-responsive photoactive coating, coated article, and method of making same

• US 20060263610A1
• Filed: 07/26/2006
• Published: 11/23/2006
• Est. Priority Date: 03/14/1997
• Status: Active Grant

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Szanyi, Janos, Greenberg, Charles B.
• Granted Patent: US 7,749,621 B2
• Time in Patent Office: Days
• US Class Current: 428/433
• CPC Class Codes: C03C 17/245 by deposition from the vapour phase
• CPC Class Codes: C03C 17/2456 Coating containing TiO2
• CPC Class Codes: C03C 17/25 by deposition from the liquid phase
• CPC Class Codes: C03C 17/256 Coating containing TiO2
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/3441 comprising carbon, a carbide or oxycarbide
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/24 Doped oxides
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2218/112 by spraying
• CPC Class Codes: C03C 2218/152 by cvd
• CPC Class Codes: C03C 2218/154 by sputtering
• CPC Class Codes: C03C 2218/155 by reactive sputtering
• CPC Class Codes: C03C 2218/156 by magnetron sputtering
• CPC Class Codes: C03C 2218/32 After-treatment
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate
• CPC Class Codes: C23C 16/40 Oxides
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/315 : Surface modified glass [e.g., tempered, strengthened, etc.]
• CPC Class Codes: Y10T 428/31678 : Of metal

Abstract

A method is provided for forming a photoactive coating having a photoabsorption band in the visible region of the electromagnetic spectrum. The method includes depositing a precursor composition over at least a portion of a float glass ribbon in a molten metal bath by a CVD coating device. The precursor composition includes a titania precursor material and at least one other precursor material selected from chromium (Cr), vanadium (V), manganese (Mn), copper (Cu), iron (Fe), magnesium (Mg), scandium (Sc), yttrium (Y), niobium (Nb), molybdenum (Mo), ruthenium (Ru), tungsten (W), silver (Ag), lead (Pb), nickel (Ni), rhenium (Re), and mixtures thereof.

Claims

1-25. -25. (canceled)

26. An article, comprising:

a substrate having at least one surface; and

a coating deposited over at least a portion of the substrate surface, wherein the coating comprises titania and at least one additional material selected from chromium (Cr), vanadium (V), manganese (Mn), copper (Cu), iron (Fe), magnesium (Mg), scandium (Sc), yttrium (Y), niobium (Nb), molybdenum (Mo), ruthenium (Ru), tungsten (W), silver (Ag), lead (Pb), nickel (Ni), rhenium (Re), and mixtures thereof, and

wherein the coating is deposited over the substrate by chemical vapor deposition.

27. The article of claim 26, wherein the substrate is selected from glass, plastic, and ceramic.

28. The article of claim 26, wherein the article is an insulating glass unit and the substrate is at least one of the panes of the insulating glass unit.

29. The article of claim 26, wherein the substrate is selected from annealed glass, tempered glass, and heat strengthened glass.

30. The article of claim 26, wherein the article is an architectural transparency.

31. The article of claim 26, wherein the coating is deposited directly on the substrate surface.

32. The article of claim 26, wherein the coating comprises titania at least partly in the anatase phase.

33. The article of claim 26, wherein the coating comprises titania at least partly in the rutile phase.

34. The article of claim 26, wherein the substrate includes at least one surface having tin diffused therein.

35. The article of claim 26, wherein the coating has a thickness of about 50 Å

to about 2000 Å

.

36. The article of claim 26, wherein the substrate is a float glass ribbon.

37. The article of claim 26, including at least one intermediate layer located between the substrate surface and the coating.

38. The article of claim 37, wherein the intermediate layer is an antireflective layer.

39. The article of claim 37, wherein the intermediate layer is a sodium ion diffusion barrier layer.

40. The article of claim 38, wherein the antireflective layer comprises at least one of aluminum oxide, tin oxide, indium oxide, silicon oxide, silicon oxycarbide, silicon oxynitride, and mixtures thereof.

41. The article of claim 39, wherein the barrier layer comprises at least one of tin oxide, silicon oxide, titanium oxide, zirconium oxide, fluorine-doped tin oxide, aluminum oxide, magnesium oxide, zinc oxide, cobalt oxide, chromium oxide, iron oxide, and mixtures thereof.

42. (canceled)