Abstract:
Prussian blue (PB) nanoparticles were synthesized from FeCl3.6H2O, K4[Fe(CN)6].3H2O, and
from Fe(NO3)3.9H2O and K4[Fe(CN)6].3H2O, and then characterized by Fourier transform
infrared (FT-IR), Ultraviolet-visible spectroscopy, X-ray diffraction (XRD), Energy dispersive
spectroscopy (EDS), Scanning electron microscopy (SEM), Raman spectroscopy and
thermogravimetric analysis. Graphene oxide and carbon nanotubes were also synthesized and
characterized. PB nanoparticles, carbon nanotubes (CNT), graphene oxide (GO) and
cetyltrimethylammonium bromide (CTAB) were sequentially deposited onto glassy carbon
electrode surface to form chemically modified electrode for the detection of hydrogen peroxide
(H2O2) and dopamine. The following electrodes were fabricated, GC-PB, GC-MWCNT, GCGO,
GC-CTAB, GC-MWCNT-PB, GC-GO-PB and GC-CTAB-PB. Cyclic and Square wave
voltammetric techniques were used to measure the hydrogen peroxide detectability of the
electrodes at pH ranges of (3 - 7.4) in 0.1M phosphate buffer solution, in the absence or presence
of 25 μL of H2O2. The GC-CNT-PB, GC-GO-PB,GC-CTAB-PB electrodes showed a good
response for the detection of hydrogen peroxide in both acidic and neutral media while the GCPB
electrode only showed good response in acidic media.
