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Fabrication and investigation of effect of core size in heterostructure PbS/CdS core/shell nanoparticles

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Abstract

PbS/CdS core/shell (CS) nanoparticles (NPs) were fabricated with three different concentrations of PbS core and CdS shell. Formation of core/shell heterostructure was confirmed from X-ray diffraction studies. The diffraction patterns exhibited formation of cubic phase and polycrystalline core/shell nanostructure. The crystalline sizes calculated from Williamson–Hall plot exhibited increase with molar concentration of precursors with decrease in strain. High resolution electron microscopy studies also confirm the formation of core/shell structure with particle size around 10 nm. A large blue-shift for PbS core compared to its bulk and small red-shift for the PbS/CdS core/shell as compared to the core is being observed in absorption spectra.

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Abbreviations

NPs:

Nanoparticles

QDs:

Quantum dots

MEG:

Multiple exciton generation

CS:

Core/shell

CBD:

Chemical bath deposition

XRD:

X-ray diffraction

SAED:

Selected area electron diffraction

HRTEM:

High resolution transmission electron microscopy

FWHM:

Full width half maximum

W–H:

Williamson–Hall

α :

Absorption coefficient

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Acknowledgements

We acknowledge department of Physics, IIT Guwahati for providing facility of XRD measurements and SAIF, NEHU, Shillong for providing facility of HRTEM. I would also like to thanks CSIR-HRDG for JRF Grant [08/446(0001)2014-EMR-1].

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Authors and Affiliations

  1. Department of Physics, Cotton University, Guwahati, Assam, 781001, India

    D. Das & A. M. P. Hussain

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  1. D. Das
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  2. A. M. P. Hussain
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Correspondence to D. Das.

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Das, D., Hussain, A.M.P. Fabrication and investigation of effect of core size in heterostructure PbS/CdS core/shell nanoparticles. Appl. Phys. A 124, 316 (2018). https://doi.org/10.1007/s00339-018-1742-y

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