[labnetwork] Gold Deposition over Chrome

[Jim Carroll]

Hi Felix,

Thank you for the suggestion.

For this mask (we have only used diced 1x1" test samples so far), the
pattern transfer to chrome was done with a classic wet etch process
(perchloric acid / ceric ammonium nitrate).  Perhaps if the mask was
underprocessed there could be some residual chrome over the glass areas, as
you speculate, increasing the adhesion of the gold to the "glass" areas.

Thanks,
Jim Carroll
*PhotomaskPORTAL*
*We help you make masks*
(415) 448-6275

   -
   <http://www.photomaskportal.com>



On Fri, May 31, 2019 at 9:03 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.
>
>
>
> ___________________________________________________
>
> Felix P. Lu, Ph.D.
>
> Director of Corporate Engagement
>
>
>
> Institute for Molecular Engineering
>
> The University of Chicago
>
> Eckhardt Research Center
>
> 5640 S. Ellis Ave., Room ACC104
>
> Chicago, IL 60637
>
>
>
> 773.834.5063 office
>
>
>
> fplu at uchicago.edu | ime.uchicago.edu
>
>
>
> *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*
>
> *We help you make masks*
> (415) 448-6275
>
> ·         [image: Image removed by sender.]
> <http://www.photomaskportal.com>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mtl.mit.edu/pipermail/labnetwork/attachments/20190531/f95d424c/attachment.html>