Fig. 1
From: Ligand-modulated synthesis of gold nanoclusters for sensitive and selective detection of folic acid
(A) Fluorescence emission spectra of HAuCl4, d-Trp, and d-Trp@AuNCs, insert: photos of the d-Trp@AuNCs under (a) day light and (b) UV light. (B) UV-vis spectra of HAuCl4, d-Trp, and d-Trp@AuNCs. (C) TEM images of d-Trp@AuNCs; insert: particles size of d-Trp@AuNCs