首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Electron transfer study on graphene modified glassy carbon substrate via electrochemical reduction and the application for tris(2,2 '-bipyridyl) ruthenium(II) electrochemiluminescence sensor fabrication
【24h】

Electron transfer study on graphene modified glassy carbon substrate via electrochemical reduction and the application for tris(2,2 '-bipyridyl) ruthenium(II) electrochemiluminescence sensor fabrication

机译:石墨烯修饰玻碳基底的电化学还原电子转移研究及其在三(2,2'-联吡啶)钌(II)电化学发光传感器中的应用

获取原文
获取原文并翻译 | 示例
           

摘要

In this study, electron transfer behavior of the graphene nanosheets attachment on glassy carbon electrode (GCE) via direct electrochemical reduction of graphene oxide (GO) is investigated for the first time. The graphene modified electrode was achieved by simply dipping the GCE in GO suspension, followed by cyclic voltammetric scanning in the potential window from 0 V to -1.5 V. Tris(2,2'-bipyridyl)ruthenium(II) [Ru(bpy)(3)(2+)] was immobilized on the graphene modified electrode and used as the redox probe to evaluate the electron transfer behavior. The electron transfer rate constant (Ks) was calculated to be 61.9 +/- 5.8 s(-1), which is much faster than that of tiled graphene modified GCE (7.1 +/- 0.6 s(-1)). The enhanced electron transfer property observed with the GCE modified by reductively deposited graphene is probably due to its standing configuration, which is beneficial to the electron transfer comparing with the tiled one. Because the abundant oxygen-containing groups are mainly located at the edges of GO, which should be much easier for the reduction to start from, the reduced GO should tend to stand on the electrode surface as evidenced by scanning electron microscopy analysis. In addition, due to the favored electron transfer and standing configuration, the Ru(bpy)(3)(2+) electrochemiluminescence sensor fabricated with standing graphene modified GCE provided much higher and more stable efficiency than that fabricated with tiled graphene. (C) 2015 Elsevier B.V. All rights reserved.
机译:在这项研究中,首次研究了石墨烯纳米片在玻璃碳电极(GCE)上通过直接电化学还原氧化石墨烯(GO)的电子转移行为。只需将GCE浸入GO悬浮液中,然后在电位窗口中从0 V到-1.5 V进行循环伏安扫描,即可获得石墨烯修饰的电极。三(2,2'-联吡啶)钌(II)[Ru(bpy) (3)(2+)]被固定在石墨烯修饰的电极上,并用作氧化还原探针以评估电子转移行为。计算出的电子传输速率常数(Ks)为61.9 +/- 5.8 s(-1),比平铺石墨烯改性的GCE(7.1 +/- 0.6 s(-1))快得多。通过还原沉积的石墨烯改性的GCE观察到的增强的电子转移性能可能是由于其直立构型,与平铺的石墨烯相比,这有利于电子转移。由于大量的含氧基团主要位于GO的边缘,从还原开始应更容易,因此还原的GO应该倾向于站在电极表面,如扫描电子显微镜分析所证明的那样。另外,由于有利的电子传递和垂直构型,由站立式石墨烯修饰的GCE制成的Ru(bpy)(3)(2+)电致发光传感器比平铺的石墨烯制造的传感器具有更高,更稳定的效率。 (C)2015 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号