• Sharifah Bee Abd Hamid

      Articles written in Bulletin of Materials Science

    • Synthesis and spectroscopic characterization of palladium-doped titanium dioxide catalyst

      Fereshteh Chekin Samira Bagheri Sharifah Bee Abd Hamid

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      In this work, we reported synthesis of palladium (Pd)-doped titanium dioxide (TiO2)(Pd-TiO2) nanoparticles by the sol–gel-assisted method. The synthesized Pd-doped TiO2 nanoparticles were characterized using X-ray diffraction, transmission electronic microscopy, energy-dispersive spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and voltammetry techniques. The analysis showed that particles are spherical in shape and pure anatase form with average size about 10 nm. To investigate the catalytic efficiency of Pd-TiO2 nanoparticles, the hydrogen evolution reaction using the deposited film of Pd-TiO2 nanoparticles on glassy carbon electrode (Pd-TiO2/GCE) was studied in 0.1 M H2SO4 solution using linear scanning voltammetry. This study demonstrates the feasibility of using gelatin for the synthesis of Pd-TiO2 catalyst.

    • Glassy carbon electrodes modified with gelatin functionalized reduced graphene oxide nanosheet for determination of gallic acid

      Fereshteh Chekin Samira Bagheri Sharifah Bee Abd Hamid

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      A simple approach for the preparation of gelatin functionalized reduced graphene oxide nanosheet (Gel-RGONS) by chemical reduction of graphene oxide (GO) using gelatin as both reducing agent and stabilizing agent in an aqueous solution was developed. The morphology and structure of the Gel-RGONS were examined by X-ray diffraction, transmission electron microscopy, ultraviolet–visible spectroscopy and Raman spectroscopy. Gelatin acted as a functionalizing reagent to guarantee good dispersibility and stability of the r in distilled water. Moreover, a new electrochemical sensor was developed based on Gel-RGONS modified glassy carbon electrode (Gel-RGONS/GCE). Gel-r exhibits excellent electrocatalytic activity to gallic acid (GA) oxidation. The experimental conditions such as pH, adsorption time and scan rate were optimized for the determination of GA. Under optimum conditions, the sensor responded linearly to GA in the concentration of 1.0 × 10−6 to 1.1 × 10−4 M with detection limit of 4.7 × 10−7 M at 3𝜎 using linear sweep voltammetry (LSV). The method has been successfully applied to the determination of GA in sample of black tea.

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