Functionalization of gold cysteamine self-assembled monolayer with ethylenediaminetetraacetic acid as a novel nanosensor
Functionalization of gold cysteamine self-assembled monolayer with ethylenediaminetetraacetic acid as a novel nanosensor
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DOI：
10.1016/j.aca.2007.01.053
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发表时间：
2007-03-28
影响因子：
6.2
通讯作者：
Bagherzadeh, Mojtaba
中科院分区：
文献类型：
--
作者：
Shervedani, Reza Karimi;Farahbakhsh, Anahita;Bagherzadeh, Mojtaba
采用循环伏安法（CV）、电化学阻抗谱（EIS）和Osteryoung方波伏安法（OSWV）对乙二胺四乙酸（EDTA）原位功能化金半胱胺自组装膜（Au-CA-EDTA SAM）进行了电化学表征。在[Fe（CN）（6）]（3-）/（4-）氧化还原探针存在下，电化学阻抗谱（EIS）和循环伏安法（CV）结果表明EDTA成功地接枝到了Au-CA电极表面。R-ct和Δ Ep随溶液pH的可逆性变化表明，Au-CA-EDTA自组装膜在较宽的pH和电位范围内稳定。利用OSWV和EIS分别测量的法拉第电流或阻抗效应研究了Pb ~（2+）和Cu ~（2+）离子在Au-CA-EDTA自组装膜电极上的富集。这些结果揭示了EDTA的活性络合官能团在表面上的存在，从而，Au-CA-EDTA SAM电极的形成。新的传感器响应Pb 2+和Cu 2+分别和同时在一个广泛的线性浓度范围。(c)2007 Elsevier B.V保留所有权利。
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 R-ct and Delta Ep 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. (c) 2007 Elsevier B.V All rights reserved.