Fig. 1From: Collagen-induced assembly of adenosine monophosphate-modified gold nanoparticles for photothermal cancer therapyCharacterization of AMP-modified Au nanoparticles (AAu NPs). A XRD pattern. B TEM image. C Digital photos showing high colloidal stability of AAu NPs after standing for a month compared to surfactant-free Au NPs (the concentration of AAu and Au NPs are ~ 80 μg/mL). D Hydrodynamic diameters of AAu NPs in different media including distilled water, PBS, and PBS supplemented with FBS for 6 days. E FTIR curves of AAu NPs and AMP. F UV–Vis absorption curves of AAu and Au NPs at the diluted concentration (i.e., ~ 8 μg/mL)Back to article page