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Sundus H. Merza
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Medicine & Pharmacology

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Electrochemical Determination of Tetracycline at SPCE modified with Nanocomposite Sundus H. Merza
Journal of Global Pharma Technology Volume 10 Issue 06: (2018) June 2018
Publisher : Journal of Global Pharma Technology

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Abstract

An electrochemical sensor based on manganese dioxide nanorodMnO2and Graphene oxide (GO) functionalized with 4-amino, 3-substituted 1H, 1, 2, 4 Triazole 5(4H) thion  (FGO)/MnO2Nanocompositewas developed for voltammetric determination of Tetracycline (TET).The working electrode WE of SPCE was modified bya drop casting method. X-ray powder diffractometer (XRD), scanning electron microscopy (SEM) and FT-IR were employed to characterize the synthesized FGO/MnO2.  The determination of TET at the modified electrode was studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in the phosphate buffer solution (PBS).TET  show sharp increase in the oxidation peaks  in the pH 2.Voltammetric characteristics of TET (Epa, Ipa) were estimated. From effect of scan rate, the average surface coverage ( ) of TET on the surface of  SPCE modified with FGO/MnO2 nanocomposite, the electron transfer coefficient and electron transfer constant rate ket was obtained as  10.56×1014 molecule cm-2, 0.5, and 10.41 cm.s-1respectively.  Under the optimal conditions, the peak current shows  linear relationship with concentration of Tetracycline (TET) ranges 1–9 µM with the detection limit of 0.2  M. The modified SPCE was successfully used to detect TETKeywords: SPCE, Functionalize graphene oxide, Cyclic voltammetry.
Effect of Functionalized Graphene Oxide (FGO) on the Electrical and Dielectrical Properties of PVA Films Sundus H. Merza
Journal of Global Pharma Technology Volume 11 Issue 09: (2019) September 2019
Publisher : Journal of Global Pharma Technology

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Abstract

In the present work, nanocomposite of poly (vinyl alcohol) (PVA) incorporated with functionalized graphene oxide (FGO) were fabricated using casting method. PVA was dispersed by varying content of FGO (0.3, 0.5, 0.8, 1 wt %). The PVA- FGO nanocomposite was characterized by FT‐IR, FE-SEM and XRD. Frequency dependence of real permittivity (ε’), imaginary (ε’’) and a.c conductivity of PVA/FGO and PVA/GO nanocomposite were studied in the frequency range 100 Hz- 1 MHz.  The experimental results showed that the values of real (ε’) and imaginary permittivity (ε’’) increased dramatically by increasing the FGO content in PVA matrix. PVA/ FGO (1 wt %) nanocomposite revealed higher electrical conductivity of 6.4×10-4 Sm-1 compared to 1.4×10-8 Sm-1 for PVA/GOKeywords: Dielectric spectroscopy, Functionalized Graphene oxide, Nanocomposite, PVA, Maxwell-Wagner-Sillars polarization.
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