Fig. 2From: Evaluating effect of metallic ions on aggregation behavior of β-amyloid peptides by atomic force microscope and surface-enhanced Raman Scatteringa Binding energy spectra of bare gold; b Binding energy spectra of MHA; c Binding energy spectra of Aβ42 monolayer; d Binding energy spectra of S2p after MHA modification. The spectra were measured at 25 °CBack to article page