6533b7dbfe1ef96bd12709a4
RESEARCH PRODUCT
Structural and chemical characterization of CdSe-ZnS core-shell quantum dots
Juan P. Martínez-pastorRafal E. Dunin-borkowskiAmir H. TavabiMiriam HerreraPedro J. Rodríguez-cantóSergio I. MolinaMartina LuysbergN. Fernández-delgadoRafael Abarguessubject
PhotoluminescenceMaterials scienceCondensed Matter::OtherShell (structure)General Physics and AstronomyQuantum yield02 engineering and technologySurfaces and InterfacesGeneral ChemistryCondensed Matter::Mesoscopic Systems and Quantum Hall Effect010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesMolecular physics0104 chemical sciencesSurfaces Coatings and FilmsCondensed Matter::Materials ScienceQuantum dotScanning transmission electron microscopyPhysics::Atomic and Molecular ClustersAtomic number0210 nano-technologyHigh-resolution transmission electron microscopyWurtzite crystal structuredescription
Abstract The structural and compositional properties of CdSe-ZnS core-shell quantum dots (QDs) with a sub-nm shell thickness are analyzed at the atomic scale using electron microscopy. QDs with both wurtzite and zinc blende crystal structures, as well as intermixing of the two structures and stacking faults, are observed. High-angle annular dark-field scanning transmission electron microscopy suggests the presence of a lower atomic number epitaxial shell of irregular thickness around a CdSe core. The presence of a shell is confirmed using energy dispersive X-ray spectroscopy. Despite the thickness irregularities, the optical properties of the particles, such as photoluminescence and quantum yield, show clear enhancement after growth of the ZnS shell.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-11-01 | Applied Surface Science |