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Preparation of Polyethylenimine‐Functionalized Graphene Oxide Composite and Its Application in Electrochemical Ammonia Sensors
Author(s) -
Song Min,
Xu Juan
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200376
Subject(s) - graphene , polyethylenimine , materials science , electrochemistry , thermogravimetric analysis , glassy carbon , raman spectroscopy , fourier transform infrared spectroscopy , oxide , composite number , electrode , electrochemical gas sensor , chemical engineering , composite material , chemistry , nanotechnology , cyclic voltammetry , transfection , biochemistry , physics , optics , engineering , metallurgy , gene
Abstract In this study, branched polyethyleneimine (PEI) was covalently linked to carboxylic acid functionalized graphene (GO‐COOH) to form GO‐COOH/PEI composites. Transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectra and thermogravimetric analysis were used to characterize the obtained composites. Electrochemical measurements indicated that the modification of the composites on the 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.