Highly dispersed carbon nanotube in new ionic liquid-graphene oxides aqueous dispersions for ultrasensitive dopamine detection

被引：45
作者：
Wang, Meiling [1 ]
Gao, Yunqiao [1 ]
Zhang, Jinjiang [1 ]
Zhao, Jianwei [1 ]
机构：
[1] Nanjing Univ, Sch Chem & Chem Engn, Key Lab Analyt Chem Life Sci, Nanjing 210093, Jiangsu, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2015年 / 155卷
基金：
中国国家自然科学基金;
关键词：
Graphite oxide; Ionic liquid; Carbon nanotube; Dopamine Detection; CORE-SHELL MICROSPHERES; REDUCED GRAPHITE OXIDE; ELECTROCHEMICAL DETECTION; ASCORBIC-ACID; URIC-ACID; POLYPYRROLE; PERFORMANCE; ELECTRODES; SUPERCAPACITORS; EXFOLIATION;
D O I：
10.1016/j.electacta.2014.12.114
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Graphite oxide (GO) is a pH-dependent amphiphile with hydrophilic edges and a more hydrophobic basal plane. It was found that when the hydrophobic prototype ionic liquid (IL) of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) was added into GO water, it experienced changes from coagulation to being redispersed in water phase by constantly turning its pH to alkali condition. Then new aqueous dispersions of GO-[BMIM][PF6] "water" formed after facile sonicate. The introduction of [BMIM][PF6] not only minimize the defects of poor electrical conductivity of GO and more interesting is that the carbon nanotube (CNT) can be highly dispersed in this GO-[BMIM][PF6] water through a simple and facile ultrasonic method at room temperature, forming a new composite of GO-[BMIM][PF6]-CNT with high dispersibility. This novel composite enhanced its electrochemical signal obviously in the measurement of dopamine (DA) in biological systems and exhibited a wider linear response ranging from 8.0 x 10(-12)-1.5 x 10(-5) M. The detection limit of 3.0 x 10(-12) Mat a signal to-noise ratio of 3 was two orders of magnitude lower than that reported previously. (C) 2014 Elsevier Ltd. All rights reserved.
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收藏
页码：236 / 243
页数：8
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