Figure 3From: Evaluating protocols and analytical methods for peptide adsorption experiments XPS C 1s spectra of K 5 deposited on Au substrates under different conditions. (a) 24 hour incubation at room temperature in a 1 mM peptide solution, 10 mM sodium phosphate buffer (pH 7). (b) 3 μL drop of stock solution dried on the substrate. (c) Same dried drop as in (b) after 15 s of low-energy (200 eV) Ar+ beam sputtering.Back to article page