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Your search keyword '"Chunying He"' showing total 2 results
Start Over Author "Chunying He" Journal journal of materials chemistry b
2 results on '"Chunying He"'

1. An electrochemical bifunctional sensor for the detection of nitrite and hydrogen peroxide based on layer-by-layer multilayer films of cationic phthalocyanine cobalt(<scp>ii</scp>) and carbon nanotubes

Author

Bin Wang, Jialin Zhang, Zhiyu Ren, Yiqun Wu, Hao Wu, Feng Wu, Zhimin Chen, and Chunying He

Subjects
Materials science, Inorganic chemistry, Layer by layer, Biomedical Engineering, chemistry.chemical_element, 02 engineering and technology, General Chemistry, General Medicine, Carbon nanotube, 010402 general chemistry, 021001 nanoscience & nanotechnology, Electrochemistry, Electrocatalyst, 01 natural sciences, 0104 chemical sciences, law.invention, chemistry.chemical_compound, chemistry, law, Phthalocyanine, General Materials Science, 0210 nano-technology, Bifunctional, Selectivity, Cobalt
Abstract

As vital biological mediators, the accurate detection of nitrite (NO2−) and hydrogen peroxide (H2O2) is desirable for clinical monitoring and diagnosis. Herein, cationic 2,9,16,23-tetra[4-(N-methyl)pyridinyloxy]phthalocyanine cobalt(II) ([TMPyPcCo]4+) and acid-treated multiwalled carbon nanotubes (aCNTs) were alternately self-assembled on the glassy carbon electrode (GCE) by means of the electrostatic interaction, leading to a 3D loose and interconnected assembly of [TMPyPcCo/aCNTs]n multilayer films. In the [TMPyPcCo/aCNTs]n films, [TMPyPcCo]4+ is anchored onto the surface of aCNTs without any inert polymer binders, which is beneficial to expose more active sites for electrocatalysis. The effective combination of [TMPyPcCo]4+ and aCNTs brings many advantages in electrochemical detection, involving the fast oriented transmission of charges, permeable channels for ion adsorption and transport, and more sensing sites, thus the [TMPyPcCo/aCNTs]n films display excellent electrochemical sensitivity towards both NO2− and H2O2. The responses of NO2− and H2O2 vary linearly with respect to the concentration from 5 µM to 30 mM and 10 µM to 9 mM. Furthermore, the superior cycling stability, reproducibility, and selectivity make [TMPyPcCo/aCNTs]n films suitable for the real samples.

Published
2016

2. A multiwalled carbon nanotube/tetra-β-isoheptyloxyphthalocyanine cobalt(II) composite with high dispersibility for electrochemical detection of ascorbic acid.

Author

Miao Shi, Zhimin Chen, Liangxiao Guo, Xiuhua Liang, Jialin Zhang, Chunying He, Bin Wang, and Yiqun Wua

Abstract

A sensitive electrochemical sensor for ascorbic acid (AA) is designed and synthesized via the following steps. The novel tetra-β-isoheptyloxyphthalocyanine cobalt(II) (PcCo) spontaneously adsorbs on the surface of acid-treated multi-walled carbon nanotubes (aMWCNTs). Then, the aMWCNT/PcCo composite was immobilized on the glassy carbon electrode (GCE). The results of UV-vis, FT-IR, TG, XPS, SEM and TEM revealed the successful self-assembly between PcCo and aMWCNTs via the π-π stacking interaction, and the aMWCNT/PcCo composite appears to have a uniform network-like structure on the GCE surface due to the four peripheral isoheptyl substituents of PcCo. Such a structure can effectively increase the electrode area, facilitate the mass transport of analytes and provide continuous conducting pathways for the transportation of electrons. Synchronously, benefitting from the synergistic effect between PcCo and aMWCNTs, the obtained electrochemical sensor has a high current and low potential for the oxidation of AA. The linear range for the AA detection is from 10 µM to 1.2 µM and the detection limit is as low as 4.0 µM. The developed biosensor exhibited good reproducibility and acceptable stability, providing a simple method for the analysis of AA. [ABSTRACT FROM AUTHOR]

Published
2014
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