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Characterization of CTAB and Cysteamine AuNPs. (a) TEM image of CTAB AuNPs showing the nanoparticles appearing as clusters of small AuNPs surrounded or internalized within a shell. (b) TEM image showing Cysteamine AuNPs. (c) The extinction spectra of the cysteamine AuNPs and CTAB AuNPs shows λmax of 528 and 526 nm; respectively.
