Fig. 1

Preparation and characterizations of Nir-Ir NPs. (A) Schematic illustration of the preparation of Nir-Ir NPs by the self-assembly of Nir and Ir. (B) The hydrodynamic size and zeta potential of Nir-Ir NPs (1 mg/ml in water) determined by DLS analysis. Data were presented as mean values ± SD. (C) Representative TEM image of Nir-Ir NPs. (D) UV-vis spectra of Ir, Nir and Nir-Ir NPs (1 mg/ml in water). (E) Fluorescence emission spectrum of Ir, Nir and Nir-Ir NPs (1 mg/mL in water) with an excitation wavelength of 350 nm