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      High-efficiency CdTe/CdS core/shell nanocrystals in water enabled by photo-induced colloidal hetero-epitaxy of CdS shelling at room temperature

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      Author
      Zare, H.
      Marandi, M.
      Fardindoost, S.
      Sharma, V.K.
      Yeltik A.
      Akhavan, O.
      Demir, Hilmi Volkan
      Taghavinia, N.
      Date
      2015
      Source Title
      Nano Research
      Print ISSN
      1998-0124
      Publisher
      Tsinghua University Press
      Volume
      8
      Issue
      7
      Pages
      2317 - 2328
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We report high-efficiency CdTe/CdS core/shell nanocrystals synthesized in water by epitaxially growing CdS shells on aqueous CdTe cores at room temperature, enabled by the controlled release of S species under low-intensity ultraviolet (UV) light illumination. The resulting photo-induced dissociation of S<inf>2</inf>O<inf>3</inf>2− ions conveniently triggers the formation of critical two-dimensional CdS epitaxy on the CdTe surface at room temperature, as opposed to initiating the growth of individual CdS core-only nanocrystals. This controlled colloidal hetero-epitaxy leads to a substantial increase in the photoluminescence (PL) quantum yield (QY) of the shelled nanocrystals in water (reaching 64%). With a systematic set of studies, the maximum PL QY is found to be almost independent of the illuminating UV intensity, while the shell formation kinetics required for reaching the maximum QY linearly depends on the illuminating UV intensity. A stability study of the QD films in air at various temperatures shows highly improved thermal stability of the shelled QDs (up to 120 °C in ambient air). These results indicate that the proposed aqueous CdTe/CdS core/shell nanocrystals hold great promise for applications requiring efficiency and stability. [Figure not available: see fulltext.] © 2015, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
      Keywords
      CdTe/CdS
      Core/shell
      Nanocrystal
      Photochemical
      Thermal stability
      Permalink
      http://hdl.handle.net/11693/21458
      Published Version (Please cite this version)
      http://dx.doi.org/10.1007/s12274-015-0742-x
      Collections
      • Department of Electrical and Electronics Engineering 3613
      • Department of Physics 2345
      • Institute of Materials Science and Nanotechnology (UNAM) 1858
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