<div dir="ltr">Hello Mario,<div><br></div><div>Do you know how the WO3 is attached to the copper? You might be able to melt the solder or dissolve the epoxy that is holding the pieces together. That may be more pleasant than trying to etch the WO3.</div><div>Good luck.</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Mar 14, 2025 at 4:39 PM Beaudoin, Mario <<a href="mailto:beaudoin@physics.ubc.ca">beaudoin@physics.ubc.ca</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"><u></u>

  

    
  
  <div>
    <p>Dear Network,</p>
    <p>I have a big copper sputter target holder on which a WO3
      (tungsten tri-oxide) target on it.  I'd like to etch away the WO3
      and keep the copper.  Anyone can recommend some appropriate wet
      chemistry?</p>
    <p>Best <br>
    </p>
    <p>Mario<br>
    </p>
    <div>-- <br>
      <img src="cid:ii_195a5974e7ae557f5d81" border="0"></div>
  </div>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Darick Baker, PhD</div><div>Manager, Engineering and Business Development</div><div>Washington Nanofabrication Facility (WNF)</div><div>University of Washington</div><div>Fluke Hall 115, Box 352143</div><div>Desk: 206.221.8265 Cell: 206.395.4049 (text preferred)</div><div><a href="https://www.wnf.washington.edu/" target="_blank">https://www.wnf.washington.edu/</a><br></div><div>Pronouns: he/him<br></div></div></div></div></div></div></div>