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Synthesis and Characterization of Magnetic Iron Oxide Nanoparticles/
Reduced Graphene Oxide and its Application in Dopamine Determination
Azleen Rashidah Binti Mohd Rosli
Supervisor: Dr. Farhanini Binti Yusoff
Bachelor of Science (Analytical and Environmental Chemistry)
School of Marine and Environmental Sciences
Universiti Malaysia Terengganu
An electrochemical sensor to determine dopamine in human body was fabricated
based on modified iron oxide/reduced graphene oxide/ glassy carbon electrode
(Fe3O4/r-GO/GCE). Determination of dopamine is significance nowadays as the
abnormal level may cause various mental health diseases. The Fe3O4/r-GO
nanocomposite was synthesized via modified Hummer’s method and physically
characterized by Fourier Transform Infrared (FTIR), Scanning Electron Microscopy
(SEM), X-Ray Diffraction (XRD) and Brunauer-Emmett-Teller (BET). SEM analysis
shows the bulky sponge-like structure attached onto an exfoliated sheets of r-GO
which indicate presence of Fe3O4 onto surface of r-GO. FTIR analysis shows the
presence of functional group of Fe-O stretch, O-H stretch, C=C stretch and C-O stretch
while the crystalline form of the Fe3O4/r-GO was determined using XRD analysis. The
catalytic activity of bare GCE and modified GCE (Fe3O4/r-GO/GCE) were observed
using electrochemical characterization of cyclic voltammetry (CV), differential pulse
voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). The observed
DPV response linearly depends on dopamine concentration in the range of 20–100
μM, with correlation coefficients of 0.995.
1935 | UMT UNDERGRADUATE RESEARCH DAY 2018