1. Home
    2. Journals
    3. Bulletin of Materials Science
    4. Volume 46
    5. All articles

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/046/0015

    • Keywords

       

      Molybdenum sulphide; dielectric constant; splitting energy; photocatalytic activity; nano flake; exciton energy.

    • Abstract

       

      Two-dimensional molybdenum sulphide (MoS$_2$) has been synthesized by hydrothermal method, and for optical characteristics, absorption and photoluminescence spectra are recorded. Variation of refractive index, extinction coefficient, dielectric constant (both real and imaginary) and optical conductivity with wavelength have been plotted. The exciton energy has been calculated in the weak electron–phonon coupling regime. The temperature-dependent splitting energy of valance band is well explained by using simulation. Splitting energy is constant up to 50 K and then decreases with increase in temperature. Average lifetime (0.75 ns) of excited electrons have been calculated using time-correlated single photon counting. X-ray diffraction (XRD), Raman spectra and high-resolution transmission electron microscope (HRTEM) have been recorded to investigate structural properties of MoS$_2$ sample. XRD shows hexagonal crystal symmetry with well-defined crystallinity. In Raman spectra, three prominent peaks are found at 381, 407 and 453 cm$^{–1}$. HRTEM also confirms that the structure of MoS$_2$ is hexagonal with three layers of nano-sheet with inter-planner spacingof 0.58 nm

    • Author Affiliations

       

      KRISHNA GOPAL MONDAL1 PARESH CHANDRA JANA SATYAJIT SAHA

      1. Department of Physics, Vidyasagar University, Midnapore 721102, India

    • Dates

       
      Published
      19 January 2023
      Manuscript received
      1 July 2022
      Accepted
      6 September 2022
      Final version published online
      19 January 2023

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2022-2023 Indian Academy of Sciences, Bengaluru.

Contact | Site index