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Synthesis of plasmonic Cu2-xSe@ZnS Core@Shell nanoparticles

 
: Wolf, Andreas; Härtling, Thomas; Hinrichs, Dominik; Dorfs, Dirk

:

ChemPhysChem 17 (2016), Nr.5, S.717-723
ISSN: 1439-4235
ISSN: 1439-7641
Deutsche Forschungsgemeinschaft DFG
DO 1580/2-1
Englisch
Zeitschriftenaufsatz
Fraunhofer IKTS ()
core-shell nanoparticles; materials science; plasmon resonances; Quantum Dots; synthesis

Abstract
We report the synthesis of plasmonic Cu2-xSe@ZnS core@shell nanoparticles (NPs). We used a shell growth approach, starting from Cu2-xSe NPs that have been shown before to exhibit a localized surface plasmon resonance (LSPR). By careful synthesis planning we avoided cation exchange reactions and received core@shell nanoparticles that, after oxidation under air, exhibit a strong LSPR in the NIR. Interestingly, the crystalline, closed ZnS shell that we grew with variable thickness still allowed a slow oxidation of the core under ambient conditions, while the core was effectively protected from reduction, even in the presence of reducing agents such as borane tert-butyamine complex and diisobutylaluminum hydride, giving rise to a stable particle LSPR, also under strongly reducing conditions.

: http://publica.fraunhofer.de/dokumente/N-374272.html