title: Ultrafast dynamics of excitons in semiconductor quantum dots on a plasmonically active nano-structured silver film.
abstract: The excited state dynamics of core-shell type semiconductor quantum dots (QDs) of various sizes in close contact with a plasmonically active silver thin film has been demonstrated by using picosecond resolved fluorescence spectroscopy. The non-radiative energy transfer from the QDs to the metal surface is found to be of Förster resonance energy transfer (FRET) type rather than the widely expected nano-surface energy transfer (NSET) type. The slower rate of energy transfer processes compared to that of the electron transfer from the excited QDs to an organic molecule benzoquinone reveals an insignificant possibility of charge migration from the QDs to the metallic film.
authors: Unit for Nanoscience and Technology, S N Bose National Centre for Basic Sciences, Salt Lake, Kolkata, India.
authors: Subrata
authors: S
authors: Batabyal
authors: Abhinandan
authors: A
authors: Makhal
authors: K
authors: K
authors: Das
authors: A K
authors: AK
authors: Raychaudhuri
authors: Samir Kumar
authors: SK
authors: Pal
mesh_terms: D016227:Benzoquinones / Q000737:chemistry; D004735:Energy Transfer; D031541:Fluorescence Resonance Energy Transfer / Q000379:methods; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D018625:Microscopy, Atomic Force / Q000379:methods; D008855:Microscopy, Electron, Scanning / Q000379:methods; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D045663:Quantum Dots; D012666:Semiconductors; D012834:Silver / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013997:Time Factors
chemical_list: D016227:Benzoquinones; D012834:Silver; C004532:quinone