Fig. 2
XPS spectrum (a) and high-resolution XPS spectra of b Au 4f and c S 2p in the fabricated Au-TTF-1. d Excitation and emission spectra of Au-TTF-1. e The optical stability of the fluorescent Au-TTF-1 in 21 days. f CT images and intensities of Au-TTF-1 with gradient concentration of 0, 50 μg/mL, 100 μg/mL, 150 μg/mL, 200 μg/mL and 300 μg/mL (R2 = 0.98)