<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066">Hi Jim,</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066">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. </div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066">I am not very sure, but I guess Argon plasma will increase roughness and help you in faster lift-off.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066">Hope this helps.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066">Best regards,</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066">Vamsi</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div><p style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(32,31,30)"><b><span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:10pt;line-height:inherit;font-family:Arial,sans-serif;vertical-align:baseline;color:inherit;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">N.P. Vamsi Krishna</span></b></p><p style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(32,31,30)"><span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:10pt;line-height:inherit;font-family:Arial,sans-serif;vertical-align:baseline;color:inherit;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">Postdoctoral Fellow</span></p><p style="margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif;color:rgb(32,31,30)"><span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:10pt;line-height:inherit;font-family:Arial,sans-serif;vertical-align:baseline;color:maroon;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">Pritzker School of Molecular Engineering<br></span><span style="margin:0px;padding:0px;border:0px;font-style:inherit;font-variant:inherit;font-weight:inherit;font-stretch:inherit;font-size:10pt;line-height:inherit;font-family:Arial,sans-serif;vertical-align:baseline;color:black">The University of Chicago<br></span></p><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><span style="color:black;font-family:Arial,sans-serif;font-size:10pt;font-style:inherit;font-variant-ligatures:inherit;font-variant-caps:inherit;font-weight:inherit">Chicago, IL 60637</span> </div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#000066"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 31, 2019 at 10:47 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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<p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:black"><br>
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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</span></span></span><u></u><span style="font-size:8pt"><a href="http://www.photomaskportal.com" target="_blank"><span style="border:1pt solid windowtext;padding:0in;text-decoration:none"><img border="0" width="200" height="56" style="width: 2.0833in; height: 0.5833in;" id="gmail-m_-2547252349334126304_x0000_i1025" alt="Image removed by sender."></span><br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font style="font-family:verdana,sans-serif;color:rgb(0,0,102)" size="2"><span style="color:rgb(102,102,102)">--<br>Thanks & Best Regards,<br>-----------------<br></span></font></div><div dir="ltr"><div style="margin:0px;padding:0px;border:0px;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:rgb(50,49,48)"><b><font face="verdana, sans-serif"><span style="color:rgb(102,102,102)">N.P.Vamsi Krishna </span><br></font></b></div><div style="margin:0px;padding:0px;border:0px;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:rgb(0,0,0)"><span style="color:rgb(102,102,102)"><b><font face="verdana, sans-serif">Postdoctoral Researcher</font></b></span></div><div style="margin:0px;padding:0px;border:0px;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:rgb(0,0,0)"><b><font face="verdana, sans-serif"><span style="color:rgb(86,86,86)">Pritzker School of Molecular Engineering </span><br></font></b></div><div style="margin:0px;padding:0px;border:0px;font-stretch:inherit;line-height:inherit;vertical-align:baseline;color:rgb(0,0,0)"><span style="color:rgb(102,102,102)"><b><font face="verdana, sans-serif">The University of Chicago</font></b></span></div></div></div></div></div></div></div></div></div></div></div></div></div>