Plating catalyst and method
A technology of electroless plating and stabilizer, applied in the field of metal electroless plating
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Embodiment 1
[0051] 155 mg of histidine (4-(2-amino-2-carboxyethyl)imidazole) was added to a beaker containing 36 mL of deionized water at room temperature (about 20° C.) to form a stabilizer solution. 0.1N HCl was added dropwise until all histidine was dissolved. Under stirring conditions, add dissolved 29.4mg Na 2 PdCl 4 (Pd +2 ) of 2 mL of deionized water. Then, the mixture was stirred at room temperature for ten minutes, and the pH was adjusted to 5.4. Subsequently, 30 mg of NaBH dissolved in the solution was added under vigorous stirring 4 2 mL of deionized water. The solution immediately turned black, indicating that Pd +2 reduced to Pd 0 .
[0052] Accelerated stability test: the above catalyst solution was then placed in a 50° C. water bath for at least 12 hours to further test its stability. Results The catalyst composition showed no visible precipitation or turbidity.
[0053]The working catalytic solution was prepared by diluting the catalytic concentration to 25 ppm w...
Embodiment 2
[0055] 310 mg of histidine was added to a beaker containing 38 mL of deionized water, and the mixture was heated to 60° C. to completely dissolve the histidine. After cooling to room temperature (about 20°C), add 1 mL of 1×10 -4 mol / L AgNO 3 solution. The solution was then stirred for ten minutes and the pH was adjusted to 12 using 0.1N NaOH. While stirring, 0.05 mL of formaldehyde solution (37%) was added to the solution, and then placed in a 60° C. water bath. The solution slowly turned bright orange and darkened as the reaction progressed. After about thirty minutes, the solution was dark orange in color. The reaction was continued at 60°C for one hour. The resulting histidine / silver nanoparticle catalyst composition was then subjected to the accelerated stability test of Example 1 and showed no precipitation or turbidity.
Embodiment 3
[0057] Na 2 PdCl 4 (138mg) was dissolved in 100mL deionized water, and 80mg of CuSO 4 ·5H 2 O. The solution turned blue-gray. Then 73 mg of histidine was added to the solution, and the solution turned slightly yellow. The pH of the resulting solution was adjusted to ~5.5 using 0.1N NaOH. Then 71mg of NaBH 4 Dissolve in 5mL deionized water. A small portion (0.5 mL) of NaBH 4 The solution was then added to the palladium / copper solution with vigorous stirring. NaBH 4 A color change to black was observed upon addition. The obtained catalyst solution was diluted to 250 ppm based on Pd, and stirred at room temperature for 30 minutes. The catalyst solution was then subjected to the accelerated stability test of Example 1 and showed no precipitation or cloudiness.
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