• NEENA JAGGI

      Articles written in Bulletin of Materials Science

    • Improvement in structural and electrical properties of cuprous oxide-coated multiwalled carbon nanotubes

      Shivani Dhall Neena Jaggi

      More Details Abstract Fulltext PDF

      In the present work, cuprous oxide (Cu2O) nanoparticles are coated on multi-walled carbon nanotubes (MWCNTs) using Fehling’s reaction. The coating of Cu2O nanoparticles on the nanotubes was confirmed by SEM and X-ray diffraction (XRD) spectra. The calculated 𝐼D/𝐼G ratio of Cu2O (using 3% CuSO4 by wt)-coated MWCNTs by Raman spectra is found to decrease to 0.94 as compared to 1.14 for pristine MWCNTs. It shows that the presence of Cu2O nanoparticles on nanotubes decreases the inherent defects present in the form of some pentagons/heptagons in the honeycomb hexagonal carbon atoms in the structure of graphene sheets of MWCNTs and increases the crystalline nature of MWCNTs, which is also confirmed by the XRD peaks. Whereas the value of 𝐼D/𝐼G ratio increases to 1.39 for sample 2 (using 5% CuSO4 by wt), which represents the structural deformation. Moreover, the electrical conductivity of MWCNTs was increased by 3 times after coating the nanotubes with Cu2O (using 3% CuSO4 by wt).

    • Effect of reaction temperature on the structural and electronic properties of stannic oxide nanostructures

      NIRMALA RANI NEENA JAGGI

      More Details Abstract Fulltext PDF

      Different nanostructured materials are having important roles in optoelectronics, gas sensing and photocatalytic applications due to their high surface to volume ratio. In this study, stannic oxide (SnO$_2$) nanostructures are prepared by hydrothermal method under optimal conditions at different temperatures (160, 180 and 200$^{\circ}$C) using surfactant cetyltrimethyl ammonium bromide. X-ray diffraction studies reveal rutile tetragonal structures of SnO$_2$ nanostructures, showing that average crystallite size is less than 10 nm. Field emission scanning electron microscope imaging reveals the morphological analysis of SnO$_2$ nanostructures fabricated at different reaction temperatures (160, 180 and 200$^{\circ}$C). Energy dispersive X-ray spectroscopy confirmed the elemental analysis of SnO$_2$ nanostructures. FTIR spectrum is recorded to confirm the presence of various functional and vibrational groups in the prepared SnO2 nanostructures. Optical properties of these nanostructures are analysed by UV–vis absorption studies. Bandgap of prepared SnO$_2$ decreased with increasing reaction temperature. Two-probe setup along with Keithley source metre is used for analysis of electricalproperties of SnO$_2$ nanostructures.

  • 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

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