Fig. 3

SERS spectra of complemented sGFP and assembled AuNP clusters. a SERS spectra of full-length GFP (blue), M3 peptide-complemented split-GFP (red), and non-complemented sGFP fragment (green) on 5 nm silver island substrates. b Liquid SERS spectra of assembled AuNP clusters at pH 8.0 (left) and pH 6.0 (right)