Visible light photoelectrochemical sensor for ultrasensitive determination of dopamine based on synergistic effect of graphene quantum dots and TiO2 nanoparticles

被引：149

作者：

Yan, Yuting ^{[1
]}

Liu, Qian ^{[1
]}

Du, Xiaojiao ^{[1
]}

Qian, Jing ^{[1
]}

Mao, Hanping ^{[1
]}

Wang, Kun ^{[1
]}

机构：

[1] Jiangsu Univ, Sch Chem & Chem Engn, Key Lab Modern Agr Equipment & Technol, Zhenjiang 212013, Peoples R China

来源：

ANALYTICA CHIMICA ACTA | 2015年 / 853卷

基金：

中国国家自然科学基金;

关键词：

Graphene quantum dot; TiO2; nanoparticle; Synergistic effect; Photoelectrochemical sensor; Dopamine; ELECTROCHEMICAL SENSOR; CDS NANOCOMPOSITES; CARBON NANOTUBES; ITO ELECTRODE; WATER; CHEMILUMINESCENCE; NANOHYBRIDS; CONVERSION; BIOSENSOR; COMPOSITE;

D O I：

10.1016/j.aca.2014.10.021

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We have demonstrated a facile approach for fabricating graphene quantum dots-TiO2 (GQDs-TiO2) nanocomposites by a simple physical adsorption method. Compared with pure GQDs and TiO2 nanoparticles (NPs), the as-prepared GQDs-TiO2 nanocomposites showed enhanced photoelectrochemical (PEC) signal under visible-light irradiation. The photocurrent of GQDs-TiO2/GCE was nearly 30-fold and 12-fold enhancement than that of GQDs/GCE and TiO2/GCE, respectively, which was attributed to the synergistic amplification between TiO2 NPs and GQDs. More interestingly, the photocurrent of GQDs-TiO2 nanocomposites was selectively sensitized by dopamine (DA), and enhanced with the increasing of DA concentration. Further, a new PEC methodology for ultrasensitive determination of DA was developed, which showed linearly enhanced photocurrent by increasing the DA concentration from 0.02 to 105 mu M with a detection limit of 6.7 nM (S/N = 3) under optimized conditions. This strategy opens up a new avenue for the application of GQDs-based nanocomposites in the field of PEC sensing and monitoring. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：258 / 264

页数：7