Issue 8, 2014

Synergistic effect of gold nanoparticles and amine functionalized cobalt porphyrin on electrochemical oxidation of hydrazine

Abstract

This paper describes the immobilization of citrate capped gold nanoparticles (cit-AuNPs) on indium tin oxide (ITO) and glassy carbon electrode (GCE) surfaces using a electroactive linker, meso-tetra(para-aminophenyl)porphyrinatocobalt(II) Co(II)MTpAP. The immobilization of cit-AuNPs on Co(II)MTpAP was achieved with the aid of amine groups present on the self-assembled monolayer (SAM) of Co(II)MTpAP. This was confirmed by UV-vis, atomic force microscopy (AFM), cyclic voltammetry, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. The particle coverage estimated from AFM was found to be ∼65% which is higher than the previously reported linkers used for immobilization. The AFM image shows that the cit-AuNPs were densely packed on Co(II)MTpAP. Furthermore, the electrocatalytic activity of the AuNP modified electrode was examined by studying the oxidation of hydrazine. Interestingly, the cit-AuNPs immobilized on Co(II)MTpAP showed a greater catalytic effect towards hydrazine oxidation than cit-AuNPs immobilized on free base porphyrin. This was attributed to the synergistic effect arising from both AuNPs and Co(II).

Graphical abstract: Synergistic effect of gold nanoparticles and amine functionalized cobalt porphyrin on electrochemical oxidation of hydrazine

Supplementary files

Article information

Article type
Paper
Submitted
04 Jan 2014
Accepted
12 May 2014
First published
13 May 2014

New J. Chem., 2014,38, 3473-3479

Synergistic effect of gold nanoparticles and amine functionalized cobalt porphyrin on electrochemical oxidation of hydrazine

P. Muthukumar and S. Abraham John, New J. Chem., 2014, 38, 3473 DOI: 10.1039/C4NJ00017J

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