Phthalocyanine Doped Metal Oxide Nanoparticles on Multiwalled Carbon Nanotubes Platform for the detection of Dopamine
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Date
2017-03-03
Journal Title
Journal ISSN
Volume Title
Publisher
Springer publishing
Abstract
The electrocatalytic properties of metal oxides (MO=Fe3O4, ZnO) nanoparticles doped phthalocyanine
(Pc) and functionalized MWCNTs, decorated on glassy carbon electrode (GCE) was investigated.
Successful synthesis of the metal oxide nanoparticles and the MO/Pc/MWCNT composite were
confirmed using UV-Vis, EDX, XRD and TEM techniques. Successful modification of GCE with the
MO and their composite was also confirmed using cyclic voltammetry (CV) technique. GCE-MWCNT/
ZnO/29H,31H-Pc was the best electrode towards DA detection with very low detection limit (0.75μM)
which compared favourably with literature, good sensitivity (1.45μA/μM), resistance to electrode
fouling, and excellent ability to detect DA without interference from AA signal. Electrocatalytic
oxidation of DA on GCE-MWCNT/ZnO/29H,31H-Pc electrode was diffusion controlled but characterized
with some adsorption of electro-oxidation reaction intermediates products. The fabricated sensors
are easy to prepare, cost effective and can be applied for real sample analysis of dopamine in drug
composition. The good electrocatalytic properties of 29H,31H-Pc and 2,3-Nc were related to their
(quantum chemically derived) frontier molecular orbital energies and global electronegativities. The
better performance of 29H,31H-Pc than 2,3-Nc in aiding electrochemical oxidation of DA might be due
to its better electron accepting ability, which is inferred from its lower ELUMO and higher χ.
Description
International journal of scientific report, 23 p.
Keywords
Phthalocyanine, Metal Oxide, electrocatalytic, nanoparticles, Electrocatalytic oxidation
Citation
Mphuthi, Ntsoaki & Adekunle, Abolanle & Fayemi, Omolola & Olasunkanmi, Lukman & Ebenso, Eno. (2017). Phthalocyanine Doped Metal Oxide Nanoparticles on Multiwalled Carbon Nanotubes Platform for the detection of Dopamine. Scientific Reports. 7. 43181. 10.1038/srep43181.