Preparation of polyethylenimine-functionalized graphene oxide composite and its application in electrochemical ammonia sensors

SONG Min; XU Juan

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Preparation of polyethylenimine-functionalized graphene oxide composite and its application in electrochemical ammonia sensors

SONG Min * #,XU Juan

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.

*Correspondence author

#Submitted by

Subject:

Funding: The National Natural Science Foundation of China （No.20907008). Research Fund for the Doctoral Program of Higher Education）

Opened online:30 November 2012

Accepted by: none

Citation: SONG Min,XU Juan.Preparation of polyethylenimine-functionalized graphene oxide composite and its application in electrochemical ammonia sensors[OL]. [30 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4496690

In this study, branched polyethyleneimine (PEI) was covalently linked to carboxylic acid functionalized graphene (GO-COOH) to form the GO-COOH/PEI composites. Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectra and thermogravimetric analysis (TG) were used to characterize the obtained composites. Electrochemical measurements indicated that the modification of the composites on electrode could efficiently enhance the voltammetric response, suggesting the potential application for making electrochemical sensors. Moreover, our results also indicated that the electrocatalytic oxidation of ammonia could be observed on the GO-COOH/PEI composites modified glassy carbon electrode. Consequently, our observations demonstrated that GO-COOH/PEI composites were excellent materials for electrochemical sensing.

Keywords:Graphene; Polymer; Composite materials; Ammonia; Electrochemical oxidation

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