Electrode modification using nanocomposites of electropolymerised cobalt phthalocyanines supported on multiwalled carbon nanotubes

Abstract

A polymer of tetra(4)-(4,6-diaminopyrimidin-2-ylthio) phthalocyaninatocobalt(II) (CoPyPc) has been deposited over a multiwalled carbon nanotube (MWCNT) platform and its electrocatalytic properties investigated side by side with polymerized cobalt tetraamino phthalocyanine (CoTAPc). X-ray photoelectron spectroscopy, scanning electron microscopy and cyclic voltammetry studies were used for characterization of the prepared polymers of cobalt phthalocyanine derivatives and their nanocomposites. L-Cysteine was used as a test analyte for the electrocatalytic activity of the nanocomposites of polymerized cobalt phthalocyanines and multiwalled carbon nanotubes. The electrocatalytic activity of both polymerized cobalt phthalocyanines was found to be superior when polymerization was done on top of MWCNTs compared to bare glassy carbon electrode. A higher sensitivity for L-cysteine detection was obtained on CoTAPc compared to CoPyPc.

Poly-Phthalocyanine–Doped Graphene Oxide Nanosheet Conjugates for Electrocatalytic Oxidation of Drug Residues

“…Amidation linkage between metallophthalocyanines and carbon-based nanomaterials has recently been reported to form highly stable electrocatalysts compared to pristine phthalocyanines (Liu et al, 2013). Electropolymerized phthalocyanines and their subsequent application as electrocatalysts have been reported before (Griveau et al, 2002;Nyoni et al, 2015;Sajjan et al, 2019), and here, we report for the first time the prepolymerized phthalocyanines for the same purpose. The uniqueness in the present paper is that the monomeric forms are different unlike in previously reported electropolymerization steps where one monomeric form was utilized.…”