期刊
ELECTROCHIMICA ACTA
卷 91, 期 -, 页码 158-165出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.12.112
关键词
Phthalocyanines; Single-walled carbon nanotubes; X-ray photoelectron spectroscopy; Scanning electrochemical microscopy; Hydrazine
资金
- Department of Science and Technology (DST)
- National Research Foundation (NRF) of South Africa through the DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology
- Rhodes University
- DST/Mintek Nanotechnology Innovation Centre (NIC)
- NRF
A glassy carbon electrode was modified by adsorption of single-walled carbon nanotubes, followed by electrochemical grafting of 4-azidobenzenediazonium salt, which was in turn reacted with ethynylpyridine through the Sharpless click chemistry reaction. Thereafter, iron phthalocyanine was attached to the electrode through axial ligation to the pyridine group. The modified electrode was characterised using X-ray photoelectron spectroscopy and scanning electrochemical microscopy, and well as electrochemistry. The electrocatalytic ability of the modified electrode was tested using hydrazine as a sample analyte, and showed a significant 10-fold improvement in the detection of hydrazine compared to the surface without nanotubes, and comparable stability. The linear range for this surface was over 1.0 x 10(-5) to 1.0 x 10(-4) mol dm(-3), with a limit of detection of 1.10 +/- 0.06 mu mol dm(-3) and sensitivity of 15.61 mu A mM(-1). (C) 2013 Elsevier Ltd. All rights reserved.
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