6.
N 1s core-level spectra collected on a) AuNPs-cit-l-cys-FITC, b) AuNPs-PEG-FITC, c) AuNPs-cit-l-cys-FITC, d) AgNPs-PEG-FITC; S 2p core-level spectra of e) AuNPs-cit-l-cys-FITC, f) AuNPs-PEG-FITC, g) AuNPs-cit-l-cys-FITC, h) AgNPs-PEG-FITC.
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