期刊
ELECTROANALYSIS
卷 29, 期 7, 页码 1731-1740出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201700084
关键词
Cobalt Phthalocyanine; Electrografting; Click Chemistry; Electroanalysis; Hydrazine
资金
- Department of Science and Technology (DST)
- National Research Foundation (NRF), South Africa through DST/NRF South African Research Chairs Initiative [UID 62620]
- Rhodes University
- DST/Mintek Nanotechnology Innovation Centre (NIC) - Sensors, South Africa
This work reports on the development of sensors for the detection of hydrazine using glassy carbon electrodes (GCE) modified with phthalocyanines through click chemistry. Tetrakis(5-hexyn-oxy) cobalt(II) phthalocyanine (complex 2) and tetrakis(5-hexyn-oxy) nickel(II) phthalocyanine (complex 3) were employed as electrode modifiers for hydrazine detection. The GCE was first grafted via the insitu diazotization of a diazonium salt, rendering the GCE surface layered with azide groups. From this point, the 1, 3-dipolar cycloaddition reaction, catalysed by a copper catalyst was utilised to click the phthalocyanines to the surface of the grafted GCE. The modified electrodes were characterized by scanning electrochemical microscopy, X-ray photoelectron spectroscopy and cyclic voltammetry. The electrografted CoP2-clicked-GCE and NiP3-clicked-GCE exhibited electrocatalytic activity towards the detection of hydrazine. The limit of detection (LoD) for the CoPc-GCE was 6.09 mu M, while the NiPc-GCE had a LoD of 8.69 mu M. The sensitivity was 51.32 mu A mM(-1) for the CoPc-GCE and 111.2 mu A mM(-1) for the NiPc-GCE.
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