4th International Euroasian Conference on Science, Engineering and Technology, Ankara, Türkiye, 14 - 16 Aralık 2022, ss.12
Fullerenes are carbon-derived nanomaterials with a spherical and 0-D structure.
They have a large surface area because of their spherical structure. Since the
large surface area increases the sensitivity of the system, the use of
fullerenes in sensor systems has increased in recent years. Surface formation
by electropolymerization of conductive monomers on the electrode surface is
quite common in sensor fabrication. Pyrrole (PPy) is one of the most commonly
used of these monomers. In this study, the effect of fullerene and its
derivatives on pyrrole polymerization was investigated using a gold
nanoparticle screen printed electrode. Fullerene, polyhydroxylated fullerene
and carboxy fullerene were selected derivatives. All of them were added to the
polymerization solution separately and the resulting surface were characterized
X-ray Photoelectron Spectroscopy (XPS) and scanning electron microscopy (SEM).
The conductivity change of the formed structures was investigated by
electrochemical impedance spectroscopy (EIS). Electropolymerization was carried
out by cyclic voltammetry (CV) method.CV parameters for the PPy
electropolymerization were determined as 0.1 and +0.5 V potential range with 50
mV/s scan rate for 5 cycles in 100mM H2SO4. SEM analysis
was performed to monitor the surface morphology of the electrodes. For SEM
analysis, the electrodes were coated with a thin gold layer for better
analysis. For this, an ion coater device was used. SEM analysis was performed
under high vacuum using an application voltage of 20 kV. The appropriate spot
size for the desired magnifications was determined as 12. XPS analysis was
performed to determine the electrode element composition and surface chemistry.
A Monochromatic Al-Kα (1486.7 eV) X-ray source and a beam size of 400 nm in
diameter were used for the XPS measurement. The survey scan of the XPS was
carried out from −10 to 1350 eV with a scanning speed of 1 eV
applying pass energy of 150 eV.