Revisiting the Anion Framework Conservation in Cation Exchange Processes

Noga Meir, Beatriz Martín-García, Iwan Moreels, Dan Oron

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11 Citations (Scopus)

Abstract

We investigated the effect of cation exchange on the anionic framework of lightly doped CdSe:Te/CdS nanorods. In contrast with previously studied core/shell systems, the Te dopant, located in the center of the CdSe core, provides an extremely sensitive indicator for any structural changes of the anionic framework that may occur as a result of the cation exchange process. We first optimized the cation exchange procedure in order to retain the fluorescence properties of the CdSe:Te/CdS nanorods after exchange of Cd2+ for Cu+ and back to Cd2+. Next, using multiexciton spectroscopy, we were able to probe the magnitude of the exciton-exciton repulsion interaction and use that to assess the degree of crystal structure conservation. Our findings provide a much stronger proof that the anion framework is indeed rigid, showing no evidence of significant migration of the anionic dopant.

Original languageEnglish
Pages (from-to)7872-7877
Number of pages6
JournalChemistry of Materials
Volume28
Issue number21
DOIs
Publication statusPublished - Nov 8 2016

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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