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Published on: January 30, 2015
A ruthenium(iii) phosphonate complex on polyallylamine functionalized carbon nanotube multilayer films:
Pan Li1, Hailing Liu, Jie Yang
1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR China. ndchenyu@gmail.com.
Abstract:
On the basis of the electrostatic and donor-acceptor interactions between carboxylated multiwalled carbon nanotubes (MWCNT-COOH) and polyallylamine hydrochloride (PAH), PAH functionalized MWCNT multilayer films ({PAH/MWCNT-COOH}n) were readily formed on a glassy carbon (GC) electrode surface through a layer-by-layer (LBL) self-assembly method. Then, the PAH functionalized MWCNT multilayer films were used as a functional interface to effectively immobilize the ruthenium(iii) ethylenediamine-tetramethylene phosphonate (EDTMP-RuIII) complex through the strong electrostatic and/or hydrogen bonding interactions between -NH2 and -PO3H2 groups. Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectrum (EDS) mapping, and Raman measurements were used to characterize the self-assembly process, structure, composition and morphology of the EDTMP-RuIII/{PAH/MWCNT-COOH}n/GC electrode. In the EDTMP-RuIII/{PAH/MWCNT-COOH}n/GC electrode, the immobilized EDTMP-RuIII complex could directly exchange electrons with the substrate electrode and showed excellent electrocatalytic activity towards iodate reduction. Thus, the fabricated EDTMP-RuIII/{PAH/MWCNT-COOH}n/GC electrode could be used as an electrochemical sensor for iodate detection.
