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DC Field | Value | Language |
---|---|---|
dc.contributor.author | Patra, Satyajit | - |
dc.date.accessioned | 2024-04-24T08:59:47Z | - |
dc.date.available | 2024-04-24T08:59:47Z | - |
dc.date.issued | 2011-08 | - |
dc.identifier.uri | https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/cphc.201100515 | - |
dc.identifier.uri | http://dspace.bits-pilani.ac.in:8080/jspui/xmlui/handle/123456789/14650 | - |
dc.description.abstract | Fluorescence quenching of CdS quantum dots (QDs) by 4-azetidinyl-7-nitrobenz-2-oxa-1,3-diazole (NBD), where the two quenching partners satisfy the spectral overlap criterion necessary for Förster resonance energy transfer (FRET), is studied by steady-state and time-resolved fluorescence techniques. The fluorescence quenching of the QDs is accompanied by an enhancement of the acceptor fluorescence and a reduction of the average fluorescence lifetime of the donor. Even though these observations are suggestive of a dynamic energy transfer process, it is shown that the quenching actually proceeds through a static interaction between the quenching partners and is probably mediated by charge-transfer interactions. The bimolecular quenching rate constant estimated from the Stern–Volmer plot of the fluorescence intensities, is found to be exceptionally high and unrealistic for the dynamic quenching process. Hence, a kinetic model is employed for the estimation of actual quencher/QD ratio dependent exciton quenching rate constants of the fluorescence quenching of CdS by NBD. The present results point to the need for a deeper analysis of the experimental quenching data to avoid erroneous conclusions. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Wiley | en_US |
dc.subject | Chemistry | en_US |
dc.subject | Quantum dots (QDs) | en_US |
dc.subject | Fluorescence quenching of Quinine sulfate dication (QSD) | en_US |
dc.title | Fluorescence Quenching of CdS Quantum Dots by 4-Azetidinyl-7-Nitrobenz-2-Oxa-1,3-Diazole: A Mechanistic Study | en_US |
dc.type | Article | en_US |
Appears in Collections: | Department of Chemistry |
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