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Photo physical studies of PVP arrested ZnS quantum dots

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Abstract

Monodispersed polyvinylpyrrolidone (PVP) arrested ZnS quantum dots (QDs) having diameter in range ~2-5 nm are synthesized by a colloidal precipitation method using PVP as the stabilizing agent. X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selective area electron diffraction (SAED) and Fourier transform infrared (FT-IR) spectroscopy are probed to investigate the structural information. The optical properties are studied using diffuse UV-visible reflectance and photoluminescence (PL) spectroscopy techniques. TEM images as well as XRD reflection peak broadening indicate the nanometer size particles formation with cubic (sphalerite) phase within the polymer matrix. Optical absorbance studies reveal an excitonic peak at around ~310 nm dictates the effect of quantum confinement effect in the ZnS QDs. PL emission spectra for ZnS QDs in PVP exhibit four emission peaks at ~382 nm, ~414 nm, ~480 nm and ~527 nm are observed. These excitonic emissions from ZnS QDs are caused by the interstitial sulfur/Zn vacancies and surface states.

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Authors and Affiliations

  1. Laser Spectroscopy & Nanomaterials Lab, Department of Physics, University of Allahabad, Allahabad, 211002, India

    Ashutosh Kumar Shahi & Ram Gopal

  2. Materials Research Center, Indian Institute of Science, Bangalore, 560012, India

    Bishnu Kumar Pandey

  3. Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, 221005, India

    Ashutosh Kumar Shahi & Bheeshma Pratap Singh

  4. National Physical Laboratory, Council of Scientific and Industrial Research, Dr K S Krishnan Road, New Delhi, 110012, India

    Bipin Kumar Gupta & Sukhvir Singh

Authors
  1. Ashutosh Kumar Shahi
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  2. Bishnu Kumar Pandey
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  3. Bheeshma Pratap Singh
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  4. Bipin Kumar Gupta
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  5. Sukhvir Singh
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  6. Ram Gopal
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Correspondence to Ashutosh Kumar Shahi.

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Shahi, A.K., Pandey, B.K., Singh, B.P. et al. Photo physical studies of PVP arrested ZnS quantum dots. Electron. Mater. Lett. 13, 160–167 (2017). https://doi.org/10.1007/s13391-017-6132-7

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  • DOI: https://doi.org/10.1007/s13391-017-6132-7

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