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(A) UV-Vis absorption spectra of silver nanoparticle colloidal solutions (freshly prepared and after storage for 24 h) and digital photos of experimental probes of AgNP. (B) Transmission electron microscope images of the colloidal silver solution. (C,D) High-resolution TEM images of silver nanocrystals. Note: The concentration of the colloidal silver solution was adjusted by dilution in distilled water for the best visibility in the UV-Vis spectrum (maximum absorbance ~2).
