Fig. 2From: Ligand-modulated synthesis of gold nanoclusters for sensitive and selective detection of folic acid(A) Fluorescence emission spectra of d-Trp@AuNCs in the absence and presence of FA, insert: photographs of (a) d-Trp@AuNCs and (b) d-Trp@AuNCs-FA. (B) TEM images of d-Trp@AuNCs-FA; insert: the particles size of d-Trp@AuNCs-FABack to article page