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High-resolution XPS spectra relevant to Au 4f regions of RTG−AuNP and RTG-lysine hydrogels, respectively. (A) Characteristic peaks of Au4f were observed at 87 and 84.5 eV, which confirm the presence of AuNPs in the RTG−AuNPs. (B) Elemental analysis of both hydrogels further indicates the AuNPs within the RTG−AuNPs.
