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Browse Prior Art Database

Concentration Monitor for Dimethylamine Borane

IP.com Disclosure Number: IPCOM000038853D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Bindra, P: AUTHOR [+3]

Abstract

The concentration of dimethylamine borane (DMAB), a reducing agent used for electroless plating of nickel, gold, palladium or silver, can be determined by detecting the peak current between a rotating platinum disk electrode and reference electrode in a plating bath. Referring to Fig. 1, rotatable holder 1 carries platinum disk 2 that is a test electrode submersed in electroless plating bath formulation in inert cylinder 3. Bath formulation flows continuously through cylinder 3 via inlet 4 and outlet 5. Reference electrode 6 is a saturated calomel rod, and a piece of foil 7 serves as a counter electrode. Programmer 8 controls voltage source 9 that is connected among test electrode 2, reference electrode 6 and counter electrode 7.

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Concentration Monitor for Dimethylamine Borane

The concentration of dimethylamine borane (DMAB), a reducing agent used for electroless plating of nickel, gold, palladium or silver, can be determined by detecting the peak current between a rotating platinum disk electrode and reference electrode in a plating bath. Referring to Fig. 1, rotatable holder 1 carries platinum disk 2 that is a test electrode submersed in electroless plating bath formulation in inert cylinder 3. Bath formulation flows continuously through cylinder 3 via inlet 4 and outlet 5. Reference electrode 6 is a saturated calomel rod, and a piece of foil 7 serves as a counter electrode. Programmer 8 controls voltage source 9 that is connected among test electrode 2, reference electrode 6 and counter electrode 7. Current flow between the rotating test electrode and the reference electrode is measured and recorded by electrometer 10. Electrode 2 is rotated at 1000 to 2000 rpm. The apparatus is calibrated by passing plating solutions of known concentrations of DMAB through cylinder 3 while current flow between electrodes 2 and 6 is measured as voltage is scanned from -0.5 V at 100 millivolts/second. A family of curves showing current flow at various DMAB concentrations is shown in Fig. 2. The peak currents ip are then plotted versus concentrations and produce a nonlinear function of Fig. 3. This curve can be linearized by further determining rate constants and plotting the ratio of DMAB concentration t...