Green synthesis and characterization of novel gold nanocomposites for electrochemical sensing applications
Journal
Talanta
Journal Volume
117
Pages
352-358
ISSN
0039-9140
Date Issued
2013-12-15
Author(s)
Abstract
Synthesis, characterization and application of Au-PANI-Calix and Au-PANI-Nap nanocomposites, is reported herein. An easy template free green synthesis is proposed and discussed for easy expediency. A variety of analytical techniques were used to characterize the nanocomposites: UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Dynamic light scattering (DLS), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS) were used to characterize the nanocomposites. Surface morphology was studied by transmission electron microscopy (TEM). The nanocomposites were immobilized on screen-printed electrode and showed electroactivity in neutral pH, making them promising candidates for various analytical applications. A sensitive and selective detection of Cu2+ was perceived on the Au-PANI-Calix modified electrode with no interference from ions K+, Ni2+, Co 2+, Pb2+, Cr3+ with a detection limit of 10 nM. The copper detection is facilitated for accessible ligation with 4-sulfocalix[4]arene, so as the Cu(II)-Calix complex formed. The electrode modified with Au-PANI-Nap showed sensing application towards H2O 2 with a detection limit of 1 μM. The modified electrodes were reproducible and stable for 2 months.
Subjects
Copper
Cyclic voltametry
Electrochemical sensor
Gold nanocomposite
Green synthesis
Hydrogen peroxide
Publisher
Elsevier B.V.
Type
journal article