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

S. H. Christiansen, J. W. Chou, M. Becker, V. Sivakov, K. Ehrhold, A. Berger, Wu-Ching Chou, D. S. Chuu, U. Gösele

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Abstract

We use nanoscale (20-300nm 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 -5M). For NWs without Au-caps, as they appear, for example, after Au etching in aqua regia or buffered KI/I2-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 633nm. The signal enhancement by single crystalline, nanoscale Au-caps is discussed and interpreted based on finite element modeling (FEM).

Original languageEnglish
Article number165301
JournalNanotechnology
Volume20
Issue number16
DOIs
StatePublished - 12 May 2009

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    Christiansen, S. H., Chou, J. W., Becker, M., Sivakov, V., Ehrhold, K., Berger, A., Chou, W-C., Chuu, D. S., & Gösele, U. (2009). Fluorescence signals of core-shell quantum dots enhanced by single crystalline gold caps on silicon nanowires. Nanotechnology, 20(16), [165301]. https://doi.org/10.1088/0957-4484/20/16/165301