Fluorescence signals of core–shell quantum dots enhanced by single crystalline gold caps on silicon nanowires

We use nanoscale (20-300 nm in diameter) single crystalline gold (Au)-caps on silicon nanowires (NWs) grown by the vapor-liquid-solid (VLS) growth mechanism to enhance the fluorescence photoluminescence (PL) signals of highly dilute core/shell CdSeTe/ZnS quantum dots (QDs) in aqueous solution (10(-5...

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Bibliographic Details
Published in:Nanotechnology 2009-04, Vol.20 (16), p.165301-165301
Main Authors: Christiansen, S H, Chou, J W, Becker, M, Sivakov, V, Ehrhold, K, Berger, A, Chou, W C, Chuu, D S, Gösele, U
Format: Article
Language:English
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Summary:We use nanoscale (20-300 nm in diameter) single crystalline gold (Au)-caps on silicon nanowires (NWs) grown by the vapor-liquid-solid (VLS) growth mechanism to enhance the fluorescence photoluminescence (PL) signals of highly dilute core/shell CdSeTe/ZnS quantum dots (QDs) in aqueous solution (10(-5) M). For NWs without Au-caps, as they appear, for example, after Au etching in aqua regia or buffered KI/I(2)-solution, essentially no fluorescence signal of the same diluted QDs could be observed. Fluorescence PL signals were measured using excitation with a laser wavelength of 633 nm. The signal enhancement by single crystalline, nanoscale Au-caps is discussed and interpreted based on finite element modeling (FEM).
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/20/16/165301