To plate, you need a seed layer that is: (1) reasonably conductive for good uniformity across the wafer (1000 A of gold is typical), and (2) has a pure metal--not oxide--surface. Chromium oxidizes immediately upon contact with room air. You're probably asking because when you strip the seed layer, you also lose some of the plated gold. An alternative is to use nickel as the seed layer, stripping the oxide immediately before plating. --Kirt Williams, Ph.D. consultant ----- Original Message ----- From: Husein RokadiaTo: Sent: Friday, September 12, 2003 9:10 AM Subject: Re: [mems-talk] Electroplating Au on Chrome > > Hi! > I have used evaporated Chrome-Gold as the seed layer to electroplate Au and > suceeded. I would like to know if it essential to have the Au layer on the > Chrome layer before I electroplate more Au? > > Thanx, > Regards, > Husein Rokadia > > _________________________________________________________________ > A chance to meet Aishwarya Rai. http://www.myenjoyzone.com/msn/knk.php3 Win > lucky prizes. > > > _______________________________________________ > MEMS-talk@memsnet.org mailing list: to unsubscribe or change your list > options, visit http://mail.mems-exchange.org/mailman/listinfo/mems-talk > Hosted by the MEMS Exchange, providers of MEMS processing services. > Visit us at http://www.memsnet.org/