If a thin gold layer (50 nm) is sputter coated on a wafer, is it possible to make this Au layer negatively charged, for example by adsorbing a negatively charged specie? Can we citrate for this purpose?
You can try attaching mercapto-benzoic acid to form a self assembled layer on gold. Citrate and thiols would leach off eventually. One (perhaps) promising approach is to electrochemically reduce a diazonium salt of benzoic acid in ACN (+ inert electrolyte) on a gold film. I tried a similar idea on carbon particles and the diazonium reduction approach seemed to work (negative zeta potential).
I have used Mercaptohexadecanoic acid in Ethanol in the past. It works well, as should the above recommendations.
Disadvantage is that lifetime is only a few days in air and the Gold should be treated within minutes of coming out of the deposition system.
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