標題: Fluorescence signals of core-shell quantum dots enhanced by single crystalline gold caps on silicon nanowires
作者: Christiansen, S. H.
Chou, J. W.
Becker, M.
Sivakov, V.
Ehrhold, K.
Berger, A.
Chou, W. C.
Chuu, D. S.
Goesele, U.
電子物理學系
Department of Electrophysics
公開日期: 22-Apr-2009
摘要: 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).
URI: http://dx.doi.org/10.1088/0957-4484/20/16/165301
http://hdl.handle.net/11536/7350
ISSN: 0957-4484
DOI: 10.1088/0957-4484/20/16/165301
期刊: NANOTECHNOLOGY
Volume: 20
Issue: 16
結束頁: 
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