Jump to main content
Jump to site search


Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations

Author affiliations

Abstract

ZnO microwires synthesised by the flame transport method and decorated with C60 clusters were studied in detail by photoluminescence (PL) and cathodoluminescence (CL) techniques. The optical investigations suggest that the enhanced near band edge recombination observed in the ZnO/C60 composites is attributed to the reduction of the ZnO band tail states in the presence of C60. Well-resolved free and bound excitons recombination, as well as 3.31 eV emission, are observed with increasing amount of C60 flooding when compared with the ZnO reference sample. Moreover, a shift of the broad visible emission to lower energies occurs with increasing C60 content. In fact, this band was found to be composed by two optical centres peaked in the green and orange/red spectral regions, presenting different lifetimes. The orange/red band exhibits faster lifetime decay, in addition to a more pronounced shift to lower energies, while the peak position of the green emission only shows a slight change. The overall redshift of the broad visible band is further enhanced by the change in the relative intensity of the mentioned optical centres, depending on the excitation intensity and on the C60 flooding. These results suggest the possibility of controlling/tuning the visible emission outcome by increasing the C60 amount on the ZnO surface due to the surface states present in the semiconductor. An adequate control of such phenomena may have quite beneficial implications when sensing applications are envisaged.

Graphical abstract: Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations

Back to tab navigation

Publication details

The article was received on 19 Oct 2018, accepted on 31 Jan 2019 and first published on 31 Jan 2019


Article type: Paper
DOI: 10.1039/C8NA00296G
Citation: Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    Probing surface states in C60 decorated ZnO microwires: detailed photoluminescence and cathodoluminescence investigations

    J. Rodrigues, D. Smazna, N. Ben Sedrine, E. Nogales, R. Adelung, Y. K. Mishra, B. Mendez, M. R. Correia and T. Monteiro, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C8NA00296G

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements