NDLI: Investigating Fluorescence Quenching of ZnS Quantum Dots by Silver Nanoparticles

Content Provider	Springer Nature Link
Author	Jaiswal, Amit Sanpui, Pallab Chattopadhyay, Arun Ghosh, Siddhartha Sankar
Copyright Year	2010
Abstract	Water dispersible zinc sulfide quantum dots (ZnS QDs) with an average diameter of 2.9 nm were synthesized in an environment friendly method using chitosan as stabilizing agent. These nanocrystals displayed characteristic absorption and emission spectra having an absorbance edge at 300 nm and emission maxima (λ $_{emission}$) at 427 nm. Citrate-capped silver nanoparticles (Ag NPs) of ca. 37-nm diameter were prepared by modified Turkevich process. The fluorescence of ZnS QDs was significantly quenched in presence of Ag NPs in a concentration-dependent manner with K $_{sv}$ value of 9 × 10$^{9}$ M$^{−1}$. The quenching mechanism was analyzed using Stern–Volmer plot which indicated mixed nature of quenching. Static mechanism was evident from the formation of electrostatic complex between positively charged ZnS QDs and negatively charged Ag NPs as confirmed by absorbance study. Due to excellent overlap between ZnS QDs emission and surface plasmon resonance band of Ag NPs, the role of energy transfer process as an additional quenching mechanism was investigated by time-resolved fluorescence measurements. Time-correlated single-photon counting study demonstrated decrease in average lifetime of ZnS QDs fluorescence in presence of Ag NPs. The corresponding Förster distance for the present QD–NP pair was calculated to be 18.4 nm.
Starting Page	125
Ending Page	132
Page Count	8
File Format	PDF
ISSN	15571955
Journal	Plasmonics
Volume Number	6
Issue Number	1
e-ISSN	15571963
Language	English
Publisher	Springer US
Publisher Date	2010-10-16
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ZnS QDs Ag NPs Fluorescence quenching Energy transfer Nanotechnology Biophysics and Biological Physics Biochemistry Biotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Biochemistry Biophysics Biotechnology

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