Synthesis of Highly Luminescent Silica-Coated CdSe/CdS Nanorods

Francesca Pietra*, Relinde Moes, Xiaoxing Ke, Sara Bals, Gustaaf Van Tendeloo, Celso de Mello Donega, Daniel Vanmaekelbergh

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

CdSe(core)/CdS(shell) nanorods (NRs) have been extensively investigated for their unique optical properties, such as high photoluminescence (PL) quantum efficiency (QE) and polarized light emission. The incorporation of these NRs in silica (SiO2) is of high interest, since this renders them processable in polar solvents while increasing their photochemical stability, which would be beneficial for their application in LEDs and as biolabels. We report the synthesis of highly luminescent silica-coated CdSe/CdS NRs, by using the reverse micelle method. The mechanism for the encapsulation of the NRs in silica is unravelled and shown to be strongly influenced by the NR shape and its asymmetry. This is attributed to both the different morphology and the different crystallographic nature of the facets terminating the opposite tips of the NRs. These results lead to the formation of a novel class of NR architectures, whose symmetry can be controlled by tuning the degree of coverage of the silica shell. Interestingly, the encapsulation of the NRs in their photostability, while preserving their optical properties. silica leads to a remarkable increase in

Original languageEnglish
Pages (from-to)3427-3434
Number of pages8
JournalChemistry of Materials
Volume25
Issue number17
DOIs
Publication statusPublished - 10 Sept 2013

Funding

The authors appreciate financial support from the European Union under the Seventh Framework Program (Integrated Infrastructure Initiative N. 262348 European Soft Matter Infrastructure, ESMI and EU-FP7 ITN Herodot). X. Ke and G. Van Tendeloo are grateful to funding from the European Research Council under the Seventh Framework Program (FP7), ERC Grant No. 246791 - COUNTATOMS. The authors acknowledge financial support from the Flemish Hercules 3 program for large infrastructure and from FOM-NPS and NWO.

Keywords

  • nanocrystals
  • reverse micelle method
  • silica shell
  • photoluminescence
  • REVERSE MICROEMULSION METHOD
  • HYDROPHOBIC QUANTUM DOTS
  • FLUORESCENT NANOPARTICLES
  • INORGANIC NANOPARTICLES
  • COLLOIDAL PARTICLES
  • GENERAL-METHOD
  • STEP SYNTHESIS
  • SEEDED GROWTH
  • SHELL
  • NANOCRYSTALS

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