Hi Jeroen, What substrate and adhesion layer are you using for these gold electrodes? Phil -----Original Message----- From: Jeroen Nieuwenhuis [mailto:jeroen_nieuwenhuis@hotmail.com] Sent: Wednesday, August 21, 2002 9:30 AM To: mems-talk@memsnet.org Subject: [mems-talk] Dissolving Gold electrodes Dear all, I am trying to measure the impedance of a 1% NaCl solution using 50 um x 150 um gold electrodes (thickness 0.6 um) in a microchannel and the electrodes dissolve in about 40 minutes(!). I used very pure NaCl and distilled water to make the solution. I use a sine-wave generator to make a 50 mV AC voltage (offset oV) and I measure the current using an transimpedance-amplifier with a 100k resistor. Nor the source nor the read-out electronics seems to generate a DC value current. Does anybody have a suggestion what is going on? To the best of my knowledge nothing should happen when the AC voltage used is less than about a volt. Regards, Jeroen Nieuwenhuis _______________________________________________ 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/ DISCLAIMER: Unless expressly stated otherwise, this message is confidential and may be privileged. It is intended for the addressee(s) only. Access, copying, disclosure or re-use of the e-mail or any information contained therein by any other person is not authorized. If you are not the intended recipient please notify the sender immediately by returning the e-mail to the originator.