Hi Rick,

I used to treat polymers with a corona discharge.If I remenber correctly we
just had a needle connected to a power supply and then you get an arc at
atmosphere.The corona discharge breaks bonds at the surface of the polymer
and creates hydrophilic radicals.
Exposing the PDMS to an oxygen plasma has the same effect.As I found out one
of the most important things is that the plasma temperature should not be
too high.

Hope this helps

Virginia Soares
INESC - Microsistemas e Nanotecnologias
R.Alves Redol,9
1000-029 LISBOA
PORTUGAL
email:vsoares@inesc-mn.pt
Tel: +351 21 3100 300 ext.2504
Fax :+351 21 314 58 43
----- Original Message -----
From: "Rick Giuly" 
To: 
Sent: Monday, August 23, 2004 12:25 AM
Subject: [mems-talk] PDMS to metal bond and corona discharge


>
> I'm patterning a gold electrode array onto PDMS.
>
> A paper by Yongman Park [1] presents a method that gives good adhesion.
You
> pattern the metal on glass and then stick it to a PDMS layer.
>
> The paper says to expose the PDMS to corona discharge. How do you do that?
Why
> do you do that? Is it the same as exposing to oxygen plasma?
>
> The paper also says treat the metal on glass with
> 3-mereaptopropyltrimethoxysilane (3-MPTMS) in ethanol solution, but it
doesn't
> say why. Why would you do that?
>
>
>
> [1] Metal Thin-Film Micropatterns Transfer on PDMS and its Application to
> Capillary Electrophoresis Electrochemical Detection on PDMS Microchip.
> Yongman Park
> 7th International Conference on Miniaturized Chemical and Biochemical
Analysis
> Systems
>
> -Rick Giuly
>  GA Tech Laboratory for Neuroengineering
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