Fig. 2

Characterization of TAT-CPNPs. a Preparation of TAT-CPNPs. b Representative TEM images of TAT-CPNPs. Scale bar, 50 nm. c Size distribution of TAT-CPNPs in DW measured with DLS. d UV–vis spectra of TAT-CPNPs and photograph (insert) of TAT-CPNPs in DW. e PA images of TAT-CPNPs of different concentrations under 1064 nm excitation. f The linear fit of PA intensity versus concentration of TAT-CPNPs under 1064 nm excitation. Error bars, SEM. g PA intensity of TAT-CPNPs under 2000 continuous 1064 nm pulses excitation