[labnetwork] Gold Deposition over Chrome

[N P VAMSI KRISHNA]

Hi Jim,
I think there is an adhesion issue of the patterned chrome and gold. I
would try giving a brief Argon or Oxygen plasma treatment before the gold
evaporation. This will improve the adhesion of Cr and Au. However, you
might need to sonicate a bit longer for the lift-off.

I am not very sure, but I guess Argon plasma will increase roughness and
help you in faster lift-off.

Hope this helps.

Best regards,
Vamsi


*N.P. Vamsi Krishna*

Postdoctoral Fellow

Pritzker School of Molecular Engineering
The University of Chicago
Chicago, IL  60637



On Fri, May 31, 2019 at 10:47 AM Felix Lu <fplu at uchicago.edu> wrote:

> Jim – How are you patterning the chrome? I would suspect that you have a
> thin layer of chrome in the “blanked” areas.
>
>
>
> ___________________________________________________
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> Felix P. Lu, Ph.D.
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> *From: *<labnetwork-bounces at mtl.mit.edu> on behalf of Jim Carroll <
> jim at photomaskportal.com>
> *Date: *Thursday, May 30, 2019 at 6:45 PM
> *To: *"labnetwork at mtl.mit.edu" <labnetwork at mtl.mit.edu>
> *Subject: *[labnetwork] Gold Deposition over Chrome
>
>
>
> Dear LabNetwork colleagues,
>
>
>
> We are trying to add a thin film of gold over patterned chrome on a
> standard photomask using e-beam evaporation.  We want the gold to
> preferentially adhere to the chrome while lifting off the glass.
>
>
> After a few tests, it appears that the gold sticks equally well to both
> the glass and chrome.  Ultrasonic agitation and swabbing do not selectively
> remove the gold from the glass while leaving it on the chrome.  Eventually,
> after enough pressure is applied with a swab, the gold releases from both
> the glass and chrome.
>
>
>
> Does anyone have a suggested approach?
>
>
> Thanks,
>
> Jim Carroll
> *PhotomaskPORTAL*
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-- 
--
Thanks & Best Regards,
-----------------

*N.P.Vamsi Krishna *
*Postdoctoral Researcher*

*Pritzker School of Molecular Engineering *
*The University of Chicago*
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