کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1274847 972626 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Derivatization of single-walled carbon nanotubes with redox mediator for biocatalytic oxygen electrodes
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Derivatization of single-walled carbon nanotubes with redox mediator for biocatalytic oxygen electrodes
چکیده انگلیسی

Single-walled carbon nanotubes (SWCNTs) were covalently modified with a redox mediator derived from 2,2′-azino-bis-(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS), and implemented in the construction of electrodes for biocatalytic oxygen reduction. The procedure is based on: covalent bonding of mediator to nanotubes, placing the nanotubes directly on the carbon electrode surface and covering the nanostructured electrode with a Nafion film containing laccase as the biocatalyst. The modified electrode is stable and the problem of mediator (ABTS) leaking from the film is eliminated by binding it covalently to the nanotubes. Three different synthetic approaches were used to obtain ABTS-modified carbon nanotubes. Nanotubes were modified at ends/defect sites or on the nanotube sidewalls and characterized by Raman spectroscopy, TGA and electrochemistry. The accessibility of differently located ABTS units by the laccase active center and mediation of electron transfer were studied by cyclic voltammetry. The surface concentrations of ABTS groups electrically connected with the electrode were compared for each of the electrodes based on the charges of the voltammetric peaks recorded in the deaerated solution. The nanotube modification procedure giving the best parameters of the catalytic process was selected.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioelectrochemistry - Volume 80, Issue 1, November 2010, Pages 73–80
نویسندگان
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