Marco, You can try using a paraffin treatment on the Pyrex, as you know wax a hydrocarbon and hydrophobic. Best Regards, Gus Tombros JP Innovations -----Original Message----- From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org] On Behalf Of Marco Doms Sent: Tuesday, November 30, 2004 8:08 AM To: mems-talk@memsnet.org Subject: [mems-talk] teflon coating of pyrex: C4F8, HMDS,...? Dear all, I am currently trying to alter the surface properties of pyrex wafers from hydrophilic to hydrophobic (contact angle > 100°). I need to coat one side of the wafer and structure the layer either by RIE or a lift-off process using photoresist as a sacrificial layer. I already tried to deposit teflon-like layers from c4f8 in a DRIE-tool. But these layers will not stick to the pyrex after lift-off in acetone and rinsing in water. Same with HMDS, deposited from the gas phase at 140°C. The c4f8-plasma deposited layers adhere perfectly to silicon by the way. Does anybody have experience with depositing and structuring teflon-like layers on pyrex or can anybody suggest any adhesion promoter or surface treatment of the pyrex to increase the adhesion of the hydrophobic coating? Thanks for your help, Marco _______________________________________________ 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/ --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.803 / Virus Database: 546 - Release Date: 11/30/2004 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.803 / Virus Database: 546 - Release Date: 11/30/2004