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In situ synthesis of CsTi2NbO7@g-C3N4 core–shell heterojunction with excellent electrocatalytic performance for the detection of nitrite

Published online by Cambridge University Press:  12 October 2018

Mengjun Wang
Affiliation:
School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
Chao Liu
Affiliation:
School of Materials Engineering, Yancheng Institute of Technology, Yancheng 224051, China
Xiaobo Zhang
Affiliation:
School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
Zichun Fan
Affiliation:
School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
Jiasheng Xu
Affiliation:
School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China
Zhiwei Tong
Affiliation:
School of Chemical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China; and SORST, Japan Science and Technology Agency (JST), Kawaguchi-shi, Saitama 332-0012, Japan
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Abstract

In this work, a N-doped CsTi2NbO7@g-C3N4 (NTCN) heterojunction nanocomposite was synthesized by a simple one-step calcination method. The as-prepared samples were characterized by means of X-ray diffraction patterns, scanning electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, and Fourier transformed infrared spectroscopy. The results showed that g-C3N4 was formed both on the surface and within the interlayers of CsTi2NbO7, in which CsTi2NbO7 was in situ doped by nitrogen atoms to form N–CsTi2NbO7. The NTCN composite displayed higher electrocatalytic activity toward the detection of nitrite than pure CsTi2NbO7 and g-C3N4. The main reasons could be attributed to the synergistic effects of morphology engineering, N-doping, and layered heterojunction. The NTCN-based electrochemical sensor expressed a good linear relationship range from 0.0999 to 3.15 mmol/L with a detection limit of 2.63 × 10−5 mol/L. The good recovery, stability, and reproducibility of this biosensor showed the potential application in environmental monitoring.

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Copyright © Materials Research Society 2018 

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In situ synthesis of CsTi2NbO7@g-C3N4 core–shell heterojunction with excellent electrocatalytic performance for the detection of nitrite
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In situ synthesis of CsTi2NbO7@g-C3N4 core–shell heterojunction with excellent electrocatalytic performance for the detection of nitrite
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