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SELECTIVE NANOSENSING OF COPPER (II) ION USING L-LYSINE FUNCTIONALIZED GOLD CYSTEAMINE SELF-ASSEMBLED MONOLAYER | ||
| Iranian Journal of Science | ||
| مقاله 6، دوره 33، شماره 4، اسفند 2009، صفحه 336-347 اصل مقاله (329.01 K) | ||
| نوع مقاله: Regular Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijsts.2009.2230 | ||
| نویسندگان | ||
| R. SHABANI1؛ S. A. MOZAFFARI2؛ s. W. HUSAIN1؛ M. SABER TEHRANI* 1 | ||
| 1Department of Chemistry, Islamic Azad University, Science and Research Branch, P.O. Box: 145-775, Tehran, I. R. of Iran | ||
| 2Advanced Institute of Technology, Iranian Research Organization for Science and Technology (IROST), P.O. Box: 15815-3538, Tehran, I. R. of Iran | ||
| چکیده | ||
| Fabrication of a cysteamine (CA) self-assembled monolayer (SAM) modified gold electrode insitu functionalized with L-Lysine (Lys) is presented and described. The fabricated electrode was used for highly selective and sensitive accumulation and the determination of copper ions (Cu2+) in a nanomolar concentration. Techniques like cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) with an external redox probe (p-Benzoquinone) were used to investigate the layer-by-layer self assembly modification on a gold electrode, monolayer structure and the ion permeation through it. The differential pulse voltammetric (DPV) method was used for determination of Cu2+. The results indicated that DPV peaks currents have a linear relationship with pCu in the concentration range of 1.0×10-12 - 1×10-6 M, with a correlation coefficient of 0.9982. The detection limit could be estimated 1.2×10-13 M according to the IUPAC recommendation (3σ). | ||
| کلیدواژهها | ||
| Self-assembled monolayer؛ L-Lysine؛ Electrochemical impedance spectroscopy؛ Copper (II) ion | ||
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