title: Synthesis of Plasmonic Cu2-x Se@ZnS Core@Shell Nanoparticles.
abstract: We report the synthesis of plasmonic Cu2-x Se@ZnS core@shell nanoparticles (NPs). We used a shell growth approach, starting from Cu2-x Se 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.
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3 A, 30167, Hannover, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Wolf
authors.affiliation: Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Maria-Reiche-Str. 2, 01109, Dresden, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Härtling
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3 A, 30167, Hannover, Germany.
authors.forename: Dominik
authors.initials: D
authors.lastname: Hinrichs
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3 A, 30167, Hannover, Germany. dirk.dorfs@pci.uni-hannover.de.
authors.forename: Dirk
authors.initials: D
authors.lastname: Dorfs
keywords: core-shell nanoparticles; materials science; plasmon resonances; quantum dots; synthesis