Abstract
AbstractIn search of fluorescent nanoclusters (NCs) for bioimaging, several methods of synthesis have been attempted. Particularly, formation of gold NCs (AuNCs) during synthesis of gold nanoparticles (AuNPs) using Good's buffers has been reported based on the optical properties of the reaction mixtures. Here we chose Good's buffers 2‐(N‐morpholino)ethanesulfonic acid (MES), 3‐(N‐morpholino)propanesulfonic acid (MOPS) and 4‐(N‐morpholino)butanesulfonic acid (MOBS) as [AuCl4]−‐reducing agents. Resulting AuNP solutions were subjected to electrochemical investigations along with UV/Vis and fluorescence spectroscopy. Distinct absorption features at approximately 290 and 360 nm and fluorescence emission in the 408–484 nm range in filtered AuNP‐free solutions were observed. Electrochemical oxidation of these buffers generates similar optical properties, suggesting that the degradation products of the buffers contribute to the optical properties of AuNP solutions. This work indicates that a deeper evaluation of fluorescence signals based on metal NPs or NCs is needed.
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