Fig. 2 | Scientific Reports

Fig. 2

From: Photoacoustic polydopamine-indocyanine green (PDA-ICG) nanoprobe for detection of senescent cells

Fig. 2

Synthesis and characterization of PDA-ICG nanoprobe. a. Schematic illustration of PDA-ICG molecular structures. b. SEM photograph showing spherical PDA-ICG, with corresponding (c) size distribution (n = 200 nanoparticles) with an average size of 75 ± 8 nm. d. Absorbance and (e) fluorescence emission spectra of bare PDA, ICG and PDA-ICG suspended in water (lexcitation = 640 nm). Compared to free ICG, the fluorescence emission of PDA-ICG shifts to lower wavelength (700 nm) and was quenched.

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