کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1170928 960696 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Functionalization of gold cysteamine self-assembled monolayer with ethylenediaminetetraacetic acid as a novel nanosensor
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Functionalization of gold cysteamine self-assembled monolayer with ethylenediaminetetraacetic acid as a novel nanosensor
چکیده انگلیسی

Electrochemical characterization of gold cysteamine self-assembled monolayer, in situ functionalized with ethylenediaminetetraacetic acid (Au–CA–EDTA SAM), is described by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Osteryoung square wave voltammetry (OSWV). The results obtained by EIS and CV, in the presence of [Fe(CN)6]3−/4− redox probe, show that EDTA is successfully grafted to the surface of Au–CA electrode. Reproducible and reversible variation of the Rct and ΔEp as a function of solution pH show that Au–CA–EDTA SAM is stable in a wide range of pH and potentials. Accumulation of the Pb2+ and Cu2+ ions on the Au–CA–EDTA SAM electrode is investigated using faradaic currents or impedimetric effects measured by OSWV and EIS, respectively. These results reveal the presence of active complexing functional groups of EDTA on the surface, and thus, the formation of Au–CA–EDTA SAM electrode. The new sensor responds to the Pb2+ and Cu2+ separately and simultaneously in a wide linear range of concentrations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 587, Issue 2, 28 March 2007, Pages 254–262
نویسندگان
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