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UV-Vis spectra and TEM images (inset) of AuNPs synthesized via citrate reduction of HAuCl4. (A) AuNPs with a surface plasmon resonance at 530 nm have a diameter of 29 ± 4 nm. (B) AuNPs with a surface plasmon resonance at 520 nm have a diameter of 14 ± 1 nm.
