Modified gold electrodes based on thiocytosine/guanine-gold nanoparticles for uric and ascorbic acid determination

被引：22

作者：

Vulcu, Adriana ^{[1
]}

Grosan, Camelia ^{[1
]}

Muresan, Liana Maria ^{[2
]}

Pruneanu, Stela ^{[1
]}

Olenic, Liliana ^{[1
]}

机构：

[1] Natl Inst Res & Dev Isotop & Mol Technol, RO-400293 Cluj Napoca, Romania

[2] Fac Chem & Chem Engn, RO-400028 Cluj Napoca, Romania

来源：

ELECTROCHIMICA ACTA | 2013年 / 88卷

关键词：

Thiocytosine/guanine-gold nanoparticles layers; Modified gold electrodes; Uric acid and ascorbic acid electrochemical determination; SELF-ASSEMBLED MONOLAYERS; GLASSY-CARBON ELECTRODE; NANOCOMPOSITES; CONSTRUCTION; DOPAMINE; SENSOR;

D O I：

10.1016/j.electacta.2012.10.074

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The present paper describes the preparation of new modified surfaces for electrodes based on guanine/thiocytosine and gold nanoparticles. The gold nanoparticles were analyzed by UV-vis spectroscopy and transmission electron microscopy (TEM) and it was found that they have diameters between 30 and 40 nm. The layers were characterized by specular reflectance infrared spectroscopy (FTIR-RAS) and by atomic force microscopy (AFM). The thickness of layers was found to be approximately 30 nm for TC layers and 300 nm for GU layers. Every layer was characterized as electrochemical sensor (by cyclic voltammetry) both for uric acid and ascorbic acid determinations, separately and in their mixture. The modified sensors have good calibration functions with good sensitivity (between 1.145 and 1.406 mA cm(-2)/decade), reproducibility (<1%) and good long-term stability (3 determinations in an interval time of 3 months). The best responses were obtained for gold_thiocytosine (Au_TC) and gold_guanine (Au_GU) layers. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：839 / 846

页数：8

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