Solvent mediated photo-induced morphological transformation of AgNPs-peptide hybrids in water-EtOH binary solvent mixture

摘要

This study demonstrates the role of greener solvents on the formation of photo-induced silver nanoparticles (AgNPs) which were encapsulated by biotinylated ditryptophan peptide molecule during self assembling process, at a particular wavelength which is 280 nm. The intermolecular H-bonding and polarity of binary solvent mixture play together a decisive role in controlling both mechanistic and kinetic pathways to modify the morphology of AgNPs-peptide hybrids. The unprecedented morphological modifications are obtained in the highly polar environment. Such modifications directly impact on the kinetics of AgNPs formation where the rate of AgNPs formation is adequately behaved bi-exponential; however, the fate of this kinetic nature is changed in the low polar solvent where the rate pursued only exponential nature. Consequently, the rate of AgNPs formation was found slowest in 80% water in ethanol compared to other solvent compositions. Therefore, the polar environment of mixed solvent leads remarkable modification in the AgNPs morphology, which could help to explain the solvent guided AgNPs modification under light. In addition to this, first time we explored the possible application of this biotinylated peptide is to detect Ag+ ions (similar to 50 mu M) affected proteins/biomolecules where we noticed the changes in Ag+ affected avidin sample, thus, can potentially be used as a silver ion sensor up to similar to 50 mu M. (C) 2017 Elsevier B.V. All rights reserved.