An Electrochemical Sensor for Diphenylamine Detection Based on Reduced Graphene Oxide/Fe₃O₄-Molecularly Imprinted Polymer with 1,4-Butanediyl-3,3'-bis-l-vinylimidazolium Dihexafluorophosphate Ionic Liquid as Cross-Linker

In this paper, we report a new composite of reduced graphene oxide/Fe₃O₄-ionic liquid based molecularly imprinted polymer (RGO/Fe₃O₄-IL-MIP) fabricated for diphenylamine (DPA) detection. RGO/Fe₃O₄-IL-MIP was prepared with RGO/Fe₃O₄ as supporter, ionic liquid 1-vinyl-3-butylimidazolium hexafluorophos...

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Bibliographic Details
Published in:Polymers 2018-12, Vol.10 (12), p.1329
Main Authors: Liu, Lingyu, Zhu, Xudong, Zeng, Yanbo, Wang, Hailong, Lu, Yixia, Zhang, Jian, Yin, Zhengzhi, Chen, Zhidong, Yang, Yiwen, Li, Lei
Format: Article
Language:English
Subjects:
Chemical sensors
Chromatography
Crosslinking
Electrodes
Fourier transforms
Glassy carbon
Graphene
Gravimetric analysis
Imprinted polymers
Infrared analysis
Ionic liquids
Iron oxides
Polymers
Sensors
Vibration
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Summary:In this paper, we report a new composite of reduced graphene oxide/Fe₃O₄-ionic liquid based molecularly imprinted polymer (RGO/Fe₃O₄-IL-MIP) fabricated for diphenylamine (DPA) detection. RGO/Fe₃O₄-IL-MIP was prepared with RGO/Fe₃O₄ as supporter, ionic liquid 1-vinyl-3-butylimidazolium hexafluorophosphate ([VC₄mim][PF₆]) as functional monomer, ionic liquid 1,4-butanediyl-3,3'-bis-l-vinylimidazolium dihexafluorophosphate ([V₂C₄(mim)₂][(PF₆)₂]) as cross-linker, and diphenylamine (DPA) as template molecule. Fourier transform infrared spectroscopy, thermal gravimetric analysis, scanning electron microscopy, and vibrating sample magnetometer were employed to characterize the RGO/Fe₃O₄-IL-MIP composite. RGO/Fe₃O₄-IL-MIP was then drop-cast onto a glassy carbon electrode to construct an electrochemical sensor for DPA. The differential pulse voltammetry (DPV) peak current response for 20 μM DPA of RGO/Fe₃O₄-IL-MIP modified glassy carbon electrode (GCE) was 3.24 and 1.68 times that of RGO/Fe₃O₄-IL-NIP and RGO/Fe₃O₄-EGDMA-MIP modified GCEs, respectively, indicating the advantage of RGO/Fe₃O₄-IL-MIP based on ionic liquid (IL) as a cross-linker. The RGO/Fe₃O₄-IL-MIP sensor demonstrated good recognition for DPA. Under the optimized conditions, the RGO/Fe₃O₄-IL-MIP sensor exhibited a DPA detection limit of 0.05 μM (S/N = 3) with a linear range of 0.1⁻30 μM. Moreover, the new RGO/Fe₃O₄-IL-MIP based sensor detected DPA in real samples with satisfactory results.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym10121329