• D K DWIVEDI

      Articles written in Bulletin of Materials Science

    • Highly efficient perylene-based polymer photocatalyst/biocatalyst systems for L-glutamate production under solar light

      POOJA SINGH SURABHI CHAUBEY CHANDANI SINGH SHAMBHAVI SHARMA RAJESH K YADAV ABHISHEK KUMAR JIN-OOK BAEG D K DWIVEDI

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      The selective production of fine chemicals using inexpensive solar light continues to be a challenge. As a means to achieve this we report herein the synthesis and development of a perylene-based solar-light-driven photocatalyst(PDA–DAA) obtained by the covalent bonding of perylene tetracarboxylic dianhydride (PDA) with a 2,6-diaminoanthraquinone (DAA) molecule. The photocatalyst/biocatalyst coupled system developed using PDA–DAA as a photocatalyst functions in a highly efficient manner, leading to high NADH regeneration (80.12%), followed by its consumption in exclusive production of L-glutamate (94.16%) from a-ketoglutarate. The present research highlights the development and application of the PDA–DAA photocatalyst for direct formation of L-glutamate under solar light.

    • Study of ac conductivity mechanism and impedance spectroscopy in CNT-added Cu$_5$Se$_{75}$Te$_{10}$In$_{10}$ chalcogenide system

      PRIYANKA JAISWAL PRAVIN KUMAR SINGH POOJA LOHIA D K DWIVEDI

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      This study is devoted to the investigation of electrical properties of multi-walled carbon nanotube (MWCNT)-contaminated Cu-Se-Te-In chalcogenide glassy composite in the temperature range 303–373 K and frequencyinterval from 1 Hz to 1 MHz. The MWCNT/chalcogenide glass was characterized by means of X-ray diffractometer, field emission scanning electron microscope, impedance spectroscopy and electrical measurements. Electrical conductivity was increased by 10–100 times of magnitude by adding 1 and 2 wt% of MWCNT to it, changing the behaviour from insulator to the semiconductor. This rapid change in the electrical conductivity for carbon nanotube-added glasses is due to the highly conducting behaviour of carbon nanotubes. The data observed from dc conductivity measurement in the temperature range 303–373 K suggest that thermally activated hopping is the dominant conduction mechanism betweenlocalized states in band tails, which is explained by Mott’s model. The temperature-dependent relaxation phenomenon has also been examined by a detailed analysis of impedance spectra.

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    • 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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