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

in: Nanotechnology (2009)
Christiansen, Silke; Chou, Jin Won; Sivakov, Vladimir; Ehrhold, Katja; Berger, Andreas; Chou, Jin Won; Chuu, Der-San; Goesele, Ulrich; Becker, Michael
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/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 633 nm. The signal enhancement by single crystalline, nanoscale Au-caps is discussed and interpreted based on finite element modeling (FEM).

Third party cookies & scripts

This site uses cookies. For optimal performance, smooth social media and promotional use, it is recommended that you agree to third party cookies and scripts. This may involve sharing information about your use of the third-party social media, advertising and analytics website.
For more information, see privacy policy and imprint.
Which cookies & scripts and the associated processing of your personal data do you agree with?

You can change your preferences anytime by visiting privacy policy.