Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 19, Pages 10776-10784Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b03594
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Funding
- IISER Bhopal
- DST-Fast track scheme SERB [SR/FT/CS-19/2011]
- UGC
- CSIR, Govt. of India
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The proteolysis of human serum albumin (HSA) templated Ag nanoclusters (NCs) induced by trypsin digestion reveals that photoluminescence (PL) intensity of the blue emitting Ag:HSA NCs exhibits a decremental behavior. The unique aspect of this study is the gradual evolution of a new red emission band characterized by an enhanced quantum yield (QY) of similar to 28% and a lifetime similar to 80 ns in contrast to the parent blue-emitting Ag:HSA NCs (QY = 16% and lifetime similar to 7.4 ns). The decay and growth PL kinetics of Ag NCs upon trypsin digestion have been used to unravel the process of destabilization of the Ag:HSA NCs and the simultaneous formation of the meta AgTp NCs as evidenced from MALDI-TOF spectra. Our fluorescence correlation spectroscopy (FCS) data substantiate the evolution of larger sized Ag NCs due to enzymatic digestion which thereby results in a slower translational diffusion rate as a consequence of their increasing hydrodynamic diameters.
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