C2-Symmetric Benzene-based Low Molecular Weight Hydrogel Modified Electrode for Highly Sensitive Detection of Copper Ions. (1st July 2015)

• Record Type: Journal Article
• Authors: Cai, Wenshu; Feng, Chuanliang; Ma, Xiaoyu; Chen, Mengni; Liu, Jianyun
• Is Part Of: Electrochimica acta. Volume 169(2015)
• Page Start: 424
• Page End: 432
• Publication Date: 2015-07-01
• Subjects: Copper -- Hydrogel modified electrode -- Low molecular weight hydrogel -- Stripping voltammetry; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.04.110
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: In this paper, a new type of low molecular weight gelators (LMWGs), C2-symmetric benzene-based hydrogel (C2-BHG) with a 1, 4-dimine benzene was self-assembled on glassy carbon electrode (GCE) and mica surface based on the hydrogen bond or hydrophobic interaction. Atomic force microscopy (AFM) characterization demonstrated the formation process of the C2-BHG hydrogel layer from particles to clusters, and finally to interconnected fiber network gel. The C2-BHG hydrogel layer resulted in the increase of the hydrophilicity of GCE surface. The C2-BHG modified GCEs (C2-BHG/GCE) with different assembly time were studied by cyclic voltammetry and electrochemical impedance spectroscopy in the presence of Fe(CN)6 4−/3− redox probe. The rich amide and hydroxyl groups in the gel film make the C2-BHG/GCE suitable as ultrasensitive sensor for the detection of Cu(II) ions by stripping voltammetry with the limit of detection of 5×10 −10 g/L (S/N>3). Under the optimal conditions, the two linear ranges of Cu(II) ions were found to be 1×10 −9 ∼1×10 −7 g/L and 1×10 −7 ∼1×10 −4 g/L. The strong coordination interaction of C2-BHG with Cu(II) ions was confirmed by UV-Visible characterization. This new type of C2-BHG modified electrode was promising for highly sensitive Cu(II) ions sensor application due to high stability and excellent selectivity of the analytical signal.