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Role of capping agents in the structural and optical properties of heterostructured type-I and type-II core/shell nanoparticles

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Abstract

PbS/CdS and CdS/PbS core/shell (CS) nanoparticles (NPs) were synthesized by chemical method using glycerol, PVA and l-cysteine as capping agents. The structural properties of PbS/CdS and CdS/PbS core/shell (CS) nanoparticles (NPs) were studied using X-ray diffractometer (XRD) and transmission electron microscope (TEM). The optical properties were studied using UV–visible absorption and photoluminescence (PL) spectroscopy. XRD pattern clearly showed the difference in particle sizes for different capping agents. A cubic structure was seen for PbS/CdS while hexagonal for CdS/PbS CS NPs. The size of the samples was calculated using Scherer formula and Williamson–Hall (W–H) plots. Formation of core/shell nanoparticles was evident from the TEM micrographs. UV–visible absorption spectra exhibited a large blue shift of the absorption maxima as compared to their bulk, which confirmed the formation of core/shell nanoparticles for three different capping agents. Photoluminescence spectra showed the emission peak shift towards higher wavelength with increase in particle size. Among capped samples, l-cysteine capped core/shell nanoparticles showed maximum luminescence intensity as compared to that of glycerol and PVA capped nanoparticles.

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Acknowledgements

We acknowledge Dept of Physics, IIT Guwahati for providing us with the XRD and SAIF, NEHU, Shillong for the HRTEM facility.

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Authors and Affiliations

  1. Department of Physics, Bineswar Brahma Engineering College, Kokrajhar, 783370, India

    D. Das

  2. Department of Physics, Cotton University, Guwahati, 781001, India

    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. Role of capping agents in the structural and optical properties of heterostructured type-I and type-II core/shell nanoparticles. Appl. Phys. A 128, 650 (2022). https://doi.org/10.1007/s00339-022-05783-8

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  • DOI: https://doi.org/10.1007/s00339-022-05783-8

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