Fig. 4From: Fabrication of avidin-stabilized gold nanoclusters with dual emissions and their application in biosensingVerification of the binding ability of Av–Au NCs to biotin. AFM images of avidin (A), Avidin-25 T (B), Avidin-50 T (C), Av–Au NCs (D), Av–Au NCs-25 T (E), and Av–Au NCs-50 T (F) (scale: 200 nm). The inset of part (E) is an amplified AFM image of an Av–Au NCs-25 T complexBack to article page