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

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

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

Fingerprint Dive into the research topics of 'Fluorescence signals of core-shell quantum dots enhanced by single crystalline gold caps on silicon nanowires'. Together they form a unique fingerprint.

Cite this