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(A) Visual color of Pluronic-PLL@Au nanoparticles at different concentrations of Pluronic-PLL: (a) 2.5 mg/mL, (b) 3.5 mg/mL and (c) 5 mg/mL. (B) TEM images of Pluronic-PLL micelles (a) and Pluronic-PLL@Au nanoparticles at different concentrations of Pluronic-PLL: (b) 2.5 mg/mL and (c) 3.5 mg/mL. (C) UV-vis spectra obtained as a function of time after the addition of HAuCl4 to the Pluronic-PLL solution at 37 °C.
