bonding pdms with gold or platinum

[Mehdi Javanmard]

Hello everybody,
I was wondering if any of you have any experience in bonding pdms with  
gold or platinum.  I've fabricated some fluidic channels with gold  
electrodes at the bottom, and when I inject fluid into the channels, I  
get leakage in the area where pdms and gold should have been bonded  
together.  i was wondering if any of you have any suggestion as to how  
to get around this problem.  Are there other metals like platinum that  
would bond better, or can gold be modified to solve this problem.
thanks,
Mehdi