How isolated are the electronic states of the core in core/shell nanoparticles?

Zuoti Xie, Tal Z. Markus, Gilad Gotesman, Zvicka Deutsch, Dan Oron, Ron Naaman

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigated how isolated are the electronic states of the core in a core-shell (c/s) nanoparticles (NPs) from the surface, when the particles are self-assembled on Au substrates via a dithiol (DT) organic linker. Applying photoemission spectroscopy the electronic states of CdSe core only and CdSe/ZnS c/s NPs were compared. The results indicate that in the c/s NPs the HOMO interacts strongly with electronic states in the Au substrate and is pinned at the same energies, relative to the Fermi level, as the core only NPs. When the capping molecules of the NPs were replaced with thiolated molecules, an interaction between the thiol groups and the electronic states of the NPs was observed that depends on the properties of the NPs studied. Thiols binding to the NPs induce the formation of surface trap states. However, while for the core only CdSe NPs the LUMO states are strongly coupled to the surface traps, independent of their size, this coupling is size dependent in the case of the CdSe/ZnS c/s NPs. For a large core, the LUMO is decoupled from the surface trap states. When the core is small enough, the LUMO is delocalized and interacts with these states.

Original languageEnglish
Pages (from-to)863-869
Number of pages7
JournalACS nano
Volume5
Issue number2
DOIs
Publication statusPublished - Feb 22 2011

Keywords

  • core/shell nanoparticles
  • electronic structures
  • electronic wave function
  • photoelectron spectroscopy
  • surface trap states

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Xie, Z., Markus, T. Z., Gotesman, G., Deutsch, Z., Oron, D., & Naaman, R. (2011). How isolated are the electronic states of the core in core/shell nanoparticles? ACS nano, 5(2), 863-869. https://doi.org/10.1021/nn102002x