Citation: LI Jun-Hua, KUANG Dai-Zhi, FENG Yong-Lan, LIU Meng-Qin, TANG Si-Ping, DENG Pei-Hong. Preparation of TNP Electrochemical Sensor Based on Silver Nanoparticles/Graphene Oxide Nanocomposite[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(6): 1157-1164. doi: 10.3969/j.issn.1001-4861.2013.00.220 shu

Preparation of TNP Electrochemical Sensor Based on Silver Nanoparticles/Graphene Oxide Nanocomposite

1.
1. Department of Chemistry and Material Science, Hengyang Normal University, Hengyang, Hunan 421008, China;

Received Date: 21 November 2012
Available Online: 11 March 2013
Fund Project: 国家自然科学基金(No.21105024,201102040) (No.21105024,201102040)湖南省教育厅科学研究基金(No.12C0536,10K010) (No.12C0536,10K010)湖南省自然科学基金(13JJ3112) (13JJ3112)功能金属有机材料湖南省高校重点实验室开放基金(No.11K02) (No.11K02)

Graphene oxide (GO) was prepared by a modified Hummers process, and then silver nanoparticles (AgNPs) were directly deposited on the surface of GO using glucose as reducing agent; finally nanocomposite of AgNPs/GO with good stability was obtained. A novel 2,4,6-trinitrophenol (TNP) electrochemical sensor was fabricated based on the prepared nanocomposite modified electrode. The nanocomposite was characterized by atomic force microscope (AFM), scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Vis spectroscopy (UV-Vis) and alternating current impedance (EIS), and the electrochemical behaviors and kinetic properties of TNP on the modified electrode were also investigated. The experimental results showed that a sensitive oxidation peak and three reduction peaks of TNP appeared at the nanocomposite modified electrode. The oxidation peak can be used for quantitative analysis of TNP. Moreover, the whole electrode process was obviously irreversible, and electrode reaction was controlled by the adsorption step. The surface coverage of nanocomposite modified electrode was 5.617×10^-8 mol·cm^-2, and the rate constant was 9.745×10^-5 cm·s^-1 at the fixed potential. In pH 6.8 phosphate buffer, the oxidation peak currents of TNP were linearly dependent on its concentrations in the range of 5.0×10^-9～1.0×10^-7 mol·L^-1 with accumulation time of 60 s at -0.70 V. The correlation coefficient was 0.995 8 and the detection limit was 1.0×10^-9 mol·L^-1. The prepared electrochemical sensor had preferable stability and selectivity, and it could be applied to the quick determination of TNP in real water samples, and the recovery was from 97.6% to 103.9%.
- graphene oxide;silver nanoparticles;2,4,6-trinitrophenol;electrochemical sensor
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