Biosensors & Bioelectronics

Nithya M

Publications

• Research Article
  Electrochemical Sensing of Ascorbic Acid on ZnO-decorated Reduced Graphene Oxide Electrode
  Author(s): Nithya MNithya M
  
  A voltammetric sensor using differential pulse voltammetry (DPV) was developed for the detection of Vitamin C (ascorbic acid). The sensing platform was ZnO-decorated reduced graphene oxide on glassy carbon electrode (ZnO-RGO-GCE). Graphene oxide, synthesized by an improved Hummers method, was reduced with zinc powder under ultrasonication, followed by washing with HCl. X-ray diffraction and scanning electron microscopy showed ZnO nanoparticles decorating the reduced graphene oxide sheets. ZnO-RGO-GCE showed reversible behaviour with ferricyanide system, had about 3.5 times more surface area than GCE, and exhibited higher currents for ascorbic acid oxidation compared to bare GCE. Ascorbic acid was sensed over a wide range of 1 μM to 5000 μM (R2=0.9899) with a sensitivity of 0.178 μA/μM-cm2 and detection limit of 0.01 μM, with good r.. Read More»
  

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