title: Interface formation during silica encapsulation of colloidal CdSe/CdS quantum dots observed by in situ Raman spectroscopy.
abstract: We investigate the encapsulation of CdSe/CdS quantum dots (QDs) in a silica shell by in situ Raman spectroscopy and find a distinct shift of the CdS Raman signal during the first hours of the synthesis. This shift does not depend on the final silica shell thickness but on the properties of the initial core-shell QD. We find a correlation between the Raman shift rate and the speed of the silica formation and attribute this to the changing configuration of the outermost layers of the QD shell, where an interface to the newly formed silica is created. This dependence of Raman shift rate on the speed of silica formation process will give rise to many possible studies concerning the growth mechanism in the water-in-oil microemulsion, rendering in situ Raman a valuable instrument in monitoring this type of reaction.
authors.affiliation: Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrae 36, 10623 Berlin, Germany.
authors.forename: Amelie
authors.identifier: 0000000305875538
authors.initials: A
authors.lastname: Biermann
authors.affiliation: Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium.
authors.forename: Tangi
authors.initials: T
authors.lastname: Aubert
authors.affiliation: Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrae 36, 10623 Berlin, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Baumeister
authors.affiliation: Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium.
authors.forename: Emile
authors.initials: E
authors.lastname: Drijvers
authors.affiliation: Physics and Chemistry of Nanostructures, Ghent University, Krijgslaan 281-S3, 9000 Gent, Belgium.
authors.forename: Zeger
authors.initials: Z
authors.lastname: Hens
authors.affiliation: Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrae 36, 10623 Berlin, Germany.
authors.forename: Janina
authors.initials: J
authors.lastname: Maultzsch