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(A) UV-Vis spectra of PEI-rGO-AuNCs, PEI-rGO, GO, and AuNCs in the wavelength range from 300 to 600 nm; (B) TEM image of PEI-rGO-AuNCs assembly; (C) SEM image of PEI-rGO-AuNCs assembly; (D) EDS of PEI-rGO-AuNCs confirming the presence of elemental C, S, O, and Au.
