ELECTROCHEMICAL SURFACE OXIDATION OF GRAPHITE ELECTRODE AND ITS SUPERIOR SENSITIVE PLATFORM FOR ELECTROCHEMICAL SENSORS

Here we first time report, the investigation of stable surface oxidized graphite electrode prepared via the anodic
oxidation of graphite in different electrolyte medium such as KOH, H2SO4 and KH2PO4. In the electrochemical
surface oxidation route, high-quality graphene oxide was produced on the surface of the graphite rod. Formation of
graphene oxide was proved with help of different techniques like X-ray diffraction, Raman spectroscopy analysis
,Fourier transform infrared spectroscopy etc. Synthesis produce was also distinguished with the help of scanning
electron microscopy (SEM), etc. Simultaneous determination of 191mV Ascorbic acid (AA), 359mV Dopamine
(DA) and 486mV Uric acid (UA) was done with the surface oxidized graphite electrode. Fast as well as sensitive
electrochemical effect for finding of AA, DA and UA at potential between 0 to 1 V in the linear reaction series
between 1µM to 10 mM with detection boundary (S/N = 3) of 1.04 µM (AA), 0.1µM (DA) and 0.108µM (UA) were
obtained. These results demonstrated that the electrochemically surface modified graphite electrode displayed a superior presentation along with elevated sensitivity and long-lasting stability.
Keywords:Fourier transforms infrared spectroscopy (FTIR), Electrochemical surface oxidized graphite, cyclic
voltammetry, Differential pulse voltammetry.