PRE-PLATING SOLUTIONS FOR MAKING PRINTED CIRCUIT BOARDS AND METHODS FOR PREPARING THE SAME

• US 20090078578A1
• Filed: 08/21/2008
• Published: 03/26/2009
• Est. Priority Date: 09/21/2007
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Original Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Inventors: Zhang, Rui, Lee, Wen-Chin, Bai, Yao-Wen, Lin, Cheng-Hsien
• Granted Patent: US 8,440,158 B2
• Time in Patent Office: Days
• US Class Current: 205/125
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: C23C 18/1204 inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
• CPC Class Codes: C23C 18/127 Preformed particles
• CPC Class Codes: C23C 18/1287 with flow inducing means, e.g. ultrasonic
• CPC Class Codes: H05K 2201/026 Nanotubes or nanowires
• CPC Class Codes: H05K 2201/0323 Carbon
• CPC Class Codes: H05K 3/424 by direct electroplating
• CPC Class Codes: H05K 3/427 initial plating of through-holes in metal-clad substrates

Abstract

A pre-plating solution for making a printed circuit board includes carbon nanotubes of 0.01-3 wt %, a surfactant of 0.01-4 wt %, an alkaline substance of 0.01-l wt % and a solvent. A method for preparing a pre-plating solution comprising the steps of: providing a plurality of carbon nanotubes; purifying the carbon nanotubes; treating the purified carbon nanotubes with an acid; mixing the treated carbon nanotubes, an alkaline substance and a solvent to form suspension; and adding surfactant into suspension.

Claims

1. A pre-plating solution for making a printed circuit board comprising:

carbon nanotubes of 0.01-3 wt %, a surfactant of 0.01-4 wt %, an alkaline substance of 0.01-1 wt % and a solvent.

2. The pre-plating solution as claimed in claim 1, further comprising an addition agent.

3. The pre-plating solution as claimed in claim 1, wherein the addition agent is material selected from a group comprising of silica gel, polyvinyl alcohol and polyvinyl pyrrolidone.

4. The pre-plating solution as claimed in claim 1, wherein one or more of the carbon nanotubes have an aspect ratio of more than 1000:

1.

5. The pre-plating solution as claimed in claim 1, wherein one or more of the carbon nanotubes have at least one hydrophilic group formed on the walls or end portions of the carbon nanotubes.

6. The pre-plating solution as claimed in claim 5, wherein the hydrophilic group is selected from a group comprising of —

COOH, —

COO and —

OH.

7. The pre-plating solution as claimed in claim 1, wherein the surfactant is selected from a group comprising of anionic surfactants and nonionic surfactants.

8. The pre-plating solution as claimed in claim 1, wherein the alkaline substance is selected from a group comprising of sodium hydroxide, potassium hydroxide, ammonium hydroxide and potassium carbonate.

9. The pre-plating solution as claimed in claim 1, wherein a PH value of the pre-plating solution is in an approximate range of 8-10.

10. The pre-plating solution as claimed in claim 1, wherein the solvent is de-ionized water.

11. A method for preparing a pre-plating solution comprising the steps of:

providing a plurality of carbon nanotubes;

purifying the carbon nanotubes;

treating the purified carbon nanotubes with an acid;

mixing the treated carbon nanotubes, an alkaline substance and a solvent to form suspension; and

adding surfactant into suspension.

12. The method for preparing a pre-plating solution as claimed in claim 11, wherein carbon nanotubes are achieved by the steps of:

forming a carbon nanotubes array on the substrate by a chemical vapor depositing method; and

peeling the carbon nanotubes array off the substrate by a mechanical method.

13. The method for preparing a pre-plating solution as claimed in claim 12, wherein the carbon nanotubes array is a super-aligned array.

14. The method for preparing a pre-plating solution as claimed in claim 11, wherein the carbon nanotubes are purified by the steps of:

being exposed to an environment of 350°

C. for predetermined time;

soaking in about 36% hydrochloric acid;

separating, rinsing with de-ionized water, and filtrating.

15. The method for preparing a pre-plating solution as claimed in claim 11, wherein carbon nanotubes are treated by the steps of:

refluxing in acid at about 130°

C.;

centrifuging the carbon nanotubes and acid and rinsing.

16. The method for preparing a pre-plating solution as claimed in claim 11, wherein acid is nitric acid.

17. The method for preparing a pre-plating solution as claimed in claim 11, wherein after adding the surfactant, the suspension is stirred at room temperature by mechanical stirring technique.