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XPS representative spectra for sensors coated with (a) gold, (b) stainless steel, (c) alumina and (d) zirconia before (w/o pellicle) and after (w/pellicle) pellicle adsorption. Tables show average ± standard deviation (N =4) of element % quantified from the XPS spectra and calculated C/signature metal and N/signature metal for each surface.
