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Ultrathin Colloidal PbS/CdS Core/Shell Nanosheets

Published online by Cambridge University Press:  02 May 2017

Simeen Khan ,
Zhoufeng Jiang ,
Shashini M Premathilka ,
Jianjun Hu ,
Andrey Voevodin ,
Paul J. Roland ,
Randy J. Ellingson  and
Liangfeng Sun
Simeen Khan
Affiliation:
Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH 43403,USA
Zhoufeng Jiang
Affiliation:
Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH 43403,USA Center of Photochemical Sciences, Bowling Green State University, Bowling Green, OH 43403,USA
Shashini M Premathilka
Affiliation:
Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH 43403,USA Center of Photochemical Sciences, Bowling Green State University, Bowling Green, OH 43403,USA
Jianjun Hu
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, USA
Andrey Voevodin
Affiliation:
Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, USA
Paul J. Roland
Affiliation:
Department of Physics and Astronomy, Wright Center for Photovoltaics Innovation and Commercialization, School of Solar and Advanced Renewable Energy, University of Toledo, Toledo, Ohio 43606, USA
Randy J. Ellingson
Affiliation:
Department of Physics and Astronomy, Wright Center for Photovoltaics Innovation and Commercialization, School of Solar and Advanced Renewable Energy, University of Toledo, Toledo, Ohio 43606, USA
Liangfeng Sun*
Affiliation:
Department of Physics and Astronomy, Bowling Green State University, Bowling Green, OH 43403,USA Center of Photochemical Sciences, Bowling Green State University, Bowling Green, OH 43403,USA
*
*(Email: lsun@bgsu.edu)
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Abstract

Emissive PbS/CdS core/shell nanosheets are synthesized using a cation-exchange method. A significant blue-shift of the photoluminescence is observed, indicating a stronger quantum confinement in the PbS core as its thickness is reduced to eight atomic layers. High resolution transmission-electron-microscopy images of the cross-sections of the core/shell nanosheets show atomically sharp interfaces between PbS and CdS. Accurate analysis of the thickness of each layer reveals the relationship between the energy-gap and the thickness in the extremely one-dimensionally confined nanostructure.

Keywords

nanostructurecore/shelloptoelectronic

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Type
Articles
Information
MRS Advances , Volume 2 , Issue 60: Nanomaterials , 2017 , pp. 3685 - 3690
Copyright
Copyright © Materials Research Society 2017 

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References

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