<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000000"><div class="gmail_default">Hi Felix,</div><div class="gmail_default"><br></div><div class="gmail_default">Thank you for the suggestion.</div><div class="gmail_default"><br></div><div class="gmail_default">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.</div><div class="gmail_default"><br></div></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><font size="2" face="verdana, sans-serif"><font color="#000000">Thanks,</font></font></div><div><font size="2" face="verdana, sans-serif"><font color="#000000">Jim Carroll<br></font><b style="color:rgb(0,0,0)">PhotomaskPORTAL</b><font color="#000000"><br></font></font></div><div><font color="#000000"><font size="2" face="verdana, sans-serif"><i>We help you make masks</i><br><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice"><span title="Call with Google Voice">(415) 448-6275</span></span></span></span></span></span></span></span></span></span></span></span></font></font></div><div></div></div><div><ul style="margin:0px;padding:0px 0px 8px;border:0px;outline:0px;font-size:11.818181991577148px;font-family:Helvetica,Arial,sans-serif;vertical-align:baseline;list-style:none;line-height:16.988636016845703px;display:table-cell;width:502.7272644042969px"><li style="margin:0px;padding:8px 12px 2px 0px;border:0px;outline:0px;font-style:inherit;font-size:11px;font-family:inherit;vertical-align:baseline;font-variant:inherit;line-height:1.2em"><dl style="margin:0px;padding:0px;border:0px;outline:0px;font-style:inherit;font-size:10.909090995788574px;font-family:inherit;vertical-align:baseline;font-variant:inherit;line-height:inherit;word-wrap:break-word"><a href="http://www.photomaskportal.com" target="_blank"><dl style="margin:0px;padding:0px;border:0px;outline:0px;font-style:inherit;font-size:10.909090995788574px;font-family:inherit;vertical-align:baseline;font-variant:inherit;line-height:inherit;word-wrap:break-word"><img src="http://www.photomaskportal.com/uploads/1/1/6/1/11617247/9425470.png" width="200" height="56"><br></dl></a></dl></li></ul></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 31, 2019 at 9:03 AM Felix Lu <<a href="mailto:fplu@uchicago.edu">fplu@uchicago.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Jim – How are you patterning the chrome? I would suspect that you have a thin layer of chrome in the “blanked” areas.<u></u><u></u></p>
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<p class="MsoNormal"><span style="color:black">___________________________________________________<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black">Felix P. Lu, Ph.D.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:black">Director of Corporate Engagement<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:rgb(192,0,0)">Institute for Molecular Engineering<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black">The University of Chicago<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black">Eckhardt Research Center<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black">5640 S. Ellis Ave., Room ACC104<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black">Chicago, IL 60637<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:black"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:black">773.834.5063 office<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="color:black"><a href="mailto:fplu@uchicago.edu" target="_blank"><span style="color:rgb(5,99,193)">fplu@uchicago.edu</span></a> |
<a href="http://ime.uchicago.edu/" target="_blank"><span style="color:rgb(5,99,193)">ime.uchicago.edu</span></a></span><u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:12pt;color:black">From: </span></b><span style="font-size:12pt;color:black"><<a href="mailto:labnetwork-bounces@mtl.mit.edu" target="_blank">labnetwork-bounces@mtl.mit.edu</a>> on behalf of Jim Carroll <<a href="mailto:jim@photomaskportal.com" target="_blank">jim@photomaskportal.com</a>><br>
<b>Date: </b>Thursday, May 30, 2019 at 6:45 PM<br>
<b>To: </b>"<a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a>" <<a href="mailto:labnetwork@mtl.mit.edu" target="_blank">labnetwork@mtl.mit.edu</a>><br>
<b>Subject: </b>[labnetwork] Gold Deposition over Chrome<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:black">Dear LabNetwork colleagues,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:black">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.<u></u><u></u></span></p>
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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. <u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:black">Does anyone have a suggested approach?<br>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black">Thanks,</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black">Jim Carroll<br>
<b>PhotomaskPORTAL</b></span><u></u><u></u></p>
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<p class="MsoNormal"><i><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black">We help you make masks</span></i><span style="font-size:10pt;font-family:Verdana,sans-serif;color:black"><br>
(415) 448-6275</span><u></u><u></u></p>
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