Synthesis and characterization of Co/CdSe core/shell nanocomposites

Bifunctional magnetic-optical nanocrystals

Hyungrak Kim, Marc Achermann, Laurent P. Balet, Jennifer A. Hollingsworth, Victor I Klimov

Research output: Contribution to journalArticle

408 Citations (Scopus)

Abstract

Nanocomposite materials provide the possibility for multifunctional properties in contrast with their more-limited single-component counterparts. Here, we report the synthesis and characterization of the first all-inorganic core/shell hybrid magnetic-optical nanoparticle, cobalt/cadmium selenide. The core/shell nanocrystals are prepared in a facile one-pot reaction, and their microstructure is analyzed using low- and high-resolution transmission electron microscopy. Using magnetic and optical characterization, we demonstrate bifunctional behavior, whereby the core retains the magnetic properties of the starting Co nanoparticle, and the shell emits similarly to a single-component CdSe nanoparticle. Interestingly, while the coercivity was found to be unchanged by shell formation, the blocking temperature for the composite structure was observed to be substantially lower (Co: >350 K; Co/CdSe: 240 K). In addition, we observed that at low temperatures (20 K) shell CdSe photoluminescence (PL) decay was very rapid (50 ns). Finally, we propose possible explanations for the unusual magnetic and optical behavior of the core/shell hybrid nanostructures.

Original languageEnglish
Pages (from-to)544-546
Number of pages3
JournalJournal of the American Chemical Society
Volume127
Issue number2
DOIs
Publication statusPublished - Jan 19 2005

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Nanocomposites
Nanoparticles
Nanocrystals
High resolution transmission electron microscopy
Cobalt
Composite structures
Coercive force
Cadmium
Temperature
Nanostructures
Magnetic properties
Photoluminescence
Transmission Electron Microscopy
Microstructure

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis and characterization of Co/CdSe core/shell nanocomposites : Bifunctional magnetic-optical nanocrystals. / Kim, Hyungrak; Achermann, Marc; Balet, Laurent P.; Hollingsworth, Jennifer A.; Klimov, Victor I.

In: Journal of the American Chemical Society, Vol. 127, No. 2, 19.01.2005, p. 544-546.

Research output: Contribution to journalArticle

Kim, Hyungrak ; Achermann, Marc ; Balet, Laurent P. ; Hollingsworth, Jennifer A. ; Klimov, Victor I. / Synthesis and characterization of Co/CdSe core/shell nanocomposites : Bifunctional magnetic-optical nanocrystals. In: Journal of the American Chemical Society. 2005 ; Vol. 127, No. 2. pp. 544-546.
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