Manganese dioxide Nanorods/electrochemically reduced graphene oxide nanocomposites modified electrodes for cost-effective and ultrasensitive detection of Amaranth

被引：139

作者：

He, Quanguo ^{[1
]}

Liu, Jun ^{[1
]}

Liu, Xiaopeng ^{[1
,2
]}

Li, Guangli ^{[1
]}

Deng, Peihong ^{[2
]}

Liang, Jing ^{[1
]}

机构：

[1] Hunan Univ Technol, Coll Life Sci & Chem, Hunan Key Lab Biomed Nanomat & Devices, Zhuzhou 412007, Peoples R China

[2] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China

来源：

COLLOIDS AND SURFACES B-BIOINTERFACES | 2018年 / 172卷

关键词：

MnO2; nanorods; Reduced graphene oxide; Modified electrode; Amaranth detection; Second-order derivative linear sweep; voltammogram; SENSITIVE VOLTAMMETRIC DETERMINATION; IONIC LIQUID; SUNSET YELLOW; ELECTROCHEMICAL SENSOR; FUNCTIONALIZED GRAPHENE; ASCORBIC-ACID; AMPEROMETRIC DETECTION; PONCEAU; 4R; URIC-ACID; COMPOSITE;

D O I：

10.1016/j.colsurfb.2018.09.005

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

A novel manganese dioxide nanorods-electrochemically graphene oxide nanocomposites modified glassy carbon electrode (MnO(2)NRs-ErGO/GCE) was developed for the rapid and sensitive detection of Amaranth in foodstuffs. The morphology, structure and composition of MnO(2)NRs, ErGO, and MnO2/ErGO were characterized by SEM and XRD. The electrochemical behavior of Amaranth on the bare GCE, ErGO/GCE, and MnO(2)NRs-ErGO/GCE were investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The voltammetric conditions (including pH, scan rate, accumulation potential as well as time) were optimized systematically. Due to large electrochemical active area and low charge transfer resistance, the MnO(2)NRs-ErGO/GCE exhibited a great enhancement effect on the oxidation of Amaranth, and significant increased the oxidation peak current i(pa) (approximately 38-fold increase compared to that of bare GCE). Under the optimum voltammetric conditions, the ipa varied linearly with Amaranth concentration in the range of 0.02 mu M-10 mu M, and 10 mu M-400 mu M with a low detection limit of 1.0 nM (S/N = 3). Moreover, satisfactory results were obtained in the analysis of real samples. Together with the merits of rapidness, cost-effectivity, high sensitivity and selectivity, the result suggests the proposed MnO(2)NRs-ErGO/GCE have broad application prospects on the sensitive detection of Amaranth in various real samples.

引用

页码：565 / 572

页数：8

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