Self assembly gold nanoparticles modified electrode for the electrochemical detection of mercury and lead
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Date
2018-06
Authors
Nur Asleena Alaudin
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Abstract
AuNPs with 40 nm particle size were synthesized using the seeding-growth method.
The synthesized AuNPs were characterized using X-ray Diffractometer, Zetasizer
analysis, Scanning Electron Microscopy, UV-Visible Near-Infrared Spectrophotometer
and Transmission Electron Microscopy. The produced AuNPs were used to self-assembled with the aid of Aminopropyltriethoxysilane (APTES) on ITO/PET electrode
for the purpose of electrochemical detection of Hg(II) and Pb(II). The effects of several
parameters were investigated for the electrochemical detection of Hg and Pb: the effect
of APTES concentration, APTES soaking period, and AuNPs soaking period. The
modified electrodes were subjected to cyclic voltammetry (CV) analysis to study the
electrochemical behavior. SWASV analysis was performed on each parameter
investigated in order to find the lowest limit of detection (LOD) value for Hg and Pb. The
results showed APTES concentration of 1% gave the lowest LOD value among the other
concentration which were 14.6 µg/L and 0.78 µg/L for Hg and Pb, respectively. Then, for
the effect of APTES soaking period, 30 minutes soaking period gave the LOD value of
13.79 µg/L and 1.97 µg/L for Hg and Pb accordingly. Finally 6 hours of AuNPs soaking
period gives the LOD value of 3.71 µg/L and 0.43 µg/L for Hg and Pb, respectively.