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Synthesis, characterizations, and optical properties of copper selenide quantum dots

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Abstract

We demonstrate the synthesis of copper selenide quantum dots (QDs) by element directed, inexpensive, straight forward wet chemical method which is free from any surfactant or template. Copper selenide QDs have been synthesized by elemental copper and selenium in the presence of ethylene glycol, hydrazine hydrate, and a defined amount of water at 70 °C within 8 h. The product is in strong quantum confinement regime, phase analysis, purity and morphology of the product has been well studied by X-ray diffraction (XRD), UV–Visible spectroscopy (UV–Vis), Photo-luminescent spectroscopy (PL), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), High resolution transmission electron microscopy (HRTEM), and by Atomic force microscopy (AFM) techniques. The absorption and photoluminescence studies display large “blue shift”. TEM and HRTEM analyses revealed that the QDs diameters are in the range 2–5 nm. Due to the quantum confinement effect copper selenide QDs could be potential building blocks to construct functional devices and solar cell. The possible mechanism is also discussed.

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Acknowledgments

Pushpendra Kumar is grateful for support from the University Grant Commission New Delhi for providing financial assistance under Rajeev Gandhi National Fellowship Scheme as SRF (RGNFS-SRF). We are also thankful to Prof. O.N. Srivastva, Dr. Anchal Srivastva, Mr. Upendra Kumar Parashar (Dept. of Physics BHU), Prof. Dhananjay Pandey (School of Materials Science, IT-BHU), Dr. Avinash Chand Pandey, Mr. Vyom Parashar, and Mr. Raghvendra S. Yadav (N.A.C. University of Allahabad) for providing constant support and help in various ways.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India

    Pushpendra Kumar & Kedar Singh

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  1. Pushpendra Kumar
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  2. Kedar Singh
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Correspondence to Kedar Singh.

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Kumar, P., Singh, K. Synthesis, characterizations, and optical properties of copper selenide quantum dots. Struct Chem 22, 103–110 (2011). https://doi.org/10.1007/s11224-010-9698-3

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