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Electroless Deposition of Metallic Palladium

IP.com Disclosure Number: IPCOM000091574D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Marshall, JH: AUTHOR

Abstract

This process is for depositing a metal from a single solution electrolessly at room temperature and atmospheric pressure conditions.

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Electroless Deposition of Metallic Palladium

This process is for depositing a metal from a single solution electrolessly at room temperature and atmospheric pressure conditions.

For step 1, dissolve dry purified palladium chloride PdCl(2) in Methyl Ethyl Ketone (M.E.K.), three grams PdCl(2)/500 ml. M.E.K. Mix for five minutes. An excess of PdCl(2) should be present and should settle to the bottom. The supernatant liquid appears slightly pink in color, which darkens to tan in one half an hour. For step 2, shake thoroughly for five minutes to disperse the PdCl(2) in the solution. Add water and mix thoroughly for five minutes.

The diluted solution begins to show some turbidity in 30 minutes. At the end of two hours, large flocks of palladium black begin to form, which is confirmed by an increase in conductance readings. In 24 hours, heavy deposits of palladium black are dispersed throughout the liquid. The side walls of the container are coated with a metallic mirror of palladium.

The solution in step 2 gives different conductance readings for different amounts of water added to it as follows: % D.I. (Deionized water) Conductance (MHOS) By Volume 1 Hr. 2 Hrs. 24 Hrs.

1 9 25 38

3 21 48 66

5 30 75 110

7 35 85 112

Control (PdCl(2) + MEK) 35 20 31 Control (D.I. water) 20 21 18 25 (Immiscible) Upper Layer 38 110 140.

The palladium metal can be utilized for plating. The amount of plating is controlled by controlling the conductance of the solution. The conductance is sens...