Try an H2N2 descum at low power and low temperature before plating.  I
wouldn't try any acid dip processes, too dangerous around gold plating
baths..

I would suggest trying a Matrix 105 system plumbed with H2N2 running at 100W
500mT 2 minutes 30 degrees C.

- Justin

-----Original Message-----
From: Jukka.Viheriala@orc.tut.fi [mailto:Jukka.Viheriala@orc.tut.fi]
Sent: Monday, January 03, 2005 4:28 AM
To: mems-talk@memsnet.org
Subject: [mems-talk] Plating Au on Ni.


Hello,

We are making process where we would like to plate gold features using
thick PR-mold. Process we had in mind was following:

1.    Evaporate Ni layer on GaAs-wafer.
2.    Make thick PR-mold
3.    Plate Au-trough mold on Ni
4.    Remove PR
5.    Etch Ni away using plated Au as a etch mask

However we have problems with plating on Ni. It just is not plating
anything. Should we try to make some pretreatment to Ni before try to plate
Au?

We have fresh and clean chemical with correct pH. Also plating Au on Au is
working correctly. We are making our plating with Enthone Nuronex 309B
plating solution (should be same stuff than Microfab Au150).

Best regards,
Jukka Viheriälä

***********************************************
Jukka Viheriälä, Researcher

Optoelectronics Research Centre
Tampere University of Technology
P.O. Box 692
FIN-333101 Tampere, Finland

Tel.: +050 595 4147
Fax  +358 3 3115 3400
Email: Jukka.Viheriala@orc.tut.fi



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