Jeroen,

Gold can be dissolved in a mixture of H2SO4 and HCL due to the free chlorine
ions, platinum would be better when chlorine is involved. More information can
be found at http://www.oicu2.com/thermo/halox.html.

Regards,

Nico Visch
nico.visch@multin.nl

-----Oorspronkelijk bericht-----
Van: Jeroen Nieuwenhuis [mailto:jeroen_nieuwenhuis@hotmail.com]
Verzonden: woensdag 21 augustus 2002 18:30
Aan: mems-talk@memsnet.org
Onderwerp: [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
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