• AYMAN NAFADY

      Articles written in Bulletin of Materials Science

    • Flower-like CuO/polyaniline composite for electrochemical determination of hydrochlorothiazide

      RAMESH LAL ANEELA TAHIRA AFTAB AHMED KHAND IRUM NAZ QURESHI JAMALUDDIN MANGI SAEED AHMED LAKHO UMAIR AFTAB BHAJAN LAL SOHA BASHA ABDULNASSER M KARAMI SAMEERAH L AL-SAEEDI AYMAN NAFADY AMAL KASRY ZAFAR HUSSAIN IBUPOTO

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      In this study, cupric oxide–polyaniline (CuO–PANI) composite was prepared by two-step methodology. First step was involved in the synthesis of PANI by the chemical oxidative polymerization of aniline in the presence of (NH$_4)_2$S$_2$O$_8$ as an oxidizing agent. In the second step, 25 mg of PANI was used as template for making a composite with CuO by hydrothermal method. The crystalline phase, morphology and composition of composite material were investigated by the powder X-ray diffraction and scanning electron microscopy techniques. The composite material contained the monoclinic phase of CuO and some poor diffraction patterns of PANI. The composite material exhibits a flower-like morphology. The CuO–PANI composite was deposited on the glassy carbon electrode and used for the electrochemical determination of hydrochlorothiazide (HCT) in Britton–Robinson (B–R) buffer pH 4.0 by the cyclic voltammetry. The HCT has shown a well resolved anodic peak at 1.20 V against Ag/AgCl reference electrode. The electrode kinetics was diffusion controlled and irreversible in nature. The CuO–PANI composite possessed a linear from 8 to 52 ${\mu}$M HCT concentration with a regression coefficient of 0.99. The limit of detection of the CuO–PANI composite was obtained as 0.8 ${\mu}$M for the HCT. The CuO–PANI composite is highly selective, stable and sensitive for the HCT. Therefore, we believe that the newly prepared CuO–PANI composite material can be useful for the different electrochemical applications.

    • Pd-Co$_3$O$_4$-based nanostructures for the development of enzyme-free glucose sensor

      ABDUL SATTAR CHANG ANEELA TAHIRA ZULIFQAR ALI SOLANGI ABDUL GHAFFAR SOLANGI MAZHAR HUSSAIN IBUPOTO FOUZIA CHANG SHYMAA S MEDANY AYMAN NAFADY AMAL KASRY MAGNUS WILLANDER ZAFAR HUSSAIN IBUPOTO

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      In this study, we report enzyme-free glucose sensors based on palladium (Pd) nanoparticles deposited onto Co$_3$O$_4$ nanostructures. A simple, low-temperature aqueous method was used for the fabrication of Co$_3$O$_4$ nanostructures.Then, Pd nanoparticles were decorated onto Co$_3$O$_4$ nanostructures using the ultraviolet reduction method. Morphology, elemental composition and crystalline features of the proposed composite nanostructures were investigated by powderX-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy techniques. Cyclic voltammetry and linear sweep voltammetry were used to investigate the electrochemical behaviour of Pd–Co$_3$O$_4$ nanostructures during glucose sensing. The proposed nanostructures showed excellent electrochemical activity for the quantitative detection of glucose at a potential of 0.6 V vs. Ag/AgCl. Importantly, the fabricated enzyme-free glucose sensor shows a linear response over the range of 1–6.0 mM glucose, with a limit of detection of 0.01 mM. The interference study was also carried out to probe the selectivity of Pd–Co$_3$O$_4$ nanostructures towards glucose detection in the presence of differentinterfering substances. The combined results attest that the as-synthesized Pd–Co$_3$O$_4$ nanostructures are highly stable and selective for the detection of glucose, suggesting their great potential for the quantitative determination of glucose in different biological fluids.

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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

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      Posted on July 25, 2019

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