Method of metallizing non-conductive substrates and metallized non-conductive substrates formed thereby
View Patent ↗Provided are methods of metallizing non-conductive substrates. The methods involve: (a) providing a non-conductive substrate having an exposed non-conductive surface; (b) forming a transition metal layer over the non-conductive surface; and (c) exposing the transition metal layer to a liquid solution of a compound chosen from one or more phosphonic acids and their salts, and monoesters of phosphoric acids and their salts, having 6 or more carbon atoms. The non-conductive substrate can be, for example, an optical fiber. Also provided are metallized non-conductive substrates and metallized optical fibers prepared by the inventive methods, as well as optoelectronic packages that include such metallized optical fibers. Particular applicability can be found in the optoelectronics industry in metallization of optical fibers and in the formation of hermetic optoelectronic device packages.
1. A method of metallizing a non-conductive substrate, comprising:
(a) providing a non-conductive substrate having an exposed non-conductive surface;
(b) forming a transition metal layer over the non-conductive surface; and
(c) exposing the transition metal layer to a liquid solution of a compound chosen from one or more phosphonic acids and their salts, and monoesters of phosphoric acids and their salts, having 6 or more carbon atoms.
2. The method of claim 1 , wherein the exposed non-conductive surface is a glass surface.
3. The method of claim 2 , wherein the non-conductive substrate is an optical fiber.
4. The method of claim 3 , wherein the metal layer is a nickel or nickel alloy layer.
5. The method of claim 3 , wherein the compound includes a plurality of hydrocarbon chains.
6. The method of claim 5 , wherein the phosphonic acid has the formula:
CF 3 (CF 2 ) 11 (CH 2 ) 2 PO(OH) 2 .
7. The method of claim 5 , wherein the compound is a phosphate monoester of the formula:
where n is an integer from 10 to 16.
8. The method of claim 3 , wherein the compound is at least partially fluorinated.
9. The method of claim 8 , wherein the compound is a phosphonic acid having from 6 to 14 perfluorinated carbon atoms.
10. The method of claim 9 , wherein the phosphonic acid has the formula:
CF 3 (CF 2 ) m (CH 2 ) n PO(OH) 2
wherein m equals 5, 7, 9 or 11, and n equals 0, 1 or 2.
11. The method of claim 9 , wherein the phosphonic acid has the formula
C 8 F 1 7 SO 2 N(CH 2 CH 3 )C 2 H 4 PO(OH) 2 .
12. The method of claim 3 , further comprising, prior to (c), exposing the transition metal layer to a chromate solution.
13. The method of claim 3 , further comprising prior to (c) forming a metal layer over the nickel or nickel alloy layer.
14. The method of claim 13 , wherein the metal layer is formed of a material chosen from gold, palladium, platinum, and alloys thereof.
15. The method of claim 14 , wherein the metal layer is formed of gold.