Journal
TALANTA
Volume 242, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2022.123295
Keywords
sp-Hybridized nitrogen atom doped ultrathin graphdiyne; Modified electrode; 6,7-Dihydroxycoumarin; Electrochemical sensor
Categories
Funding
- National Natural Science Foundation of China [21964007]
- Hainan Provincial Natural Science Foundation of High Level-talent Project [2019RC188]
- Key Research and Development Program of Hainan Province-Social Development Direction [ZDYF2020204]
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This paper investigates nitrogen-doped ultrathin graphdiyne (NUGDY) based on graphdiyne and its application as a modified electrode for the analysis of 6,7-dihydroxycoumarin. The results show that NUGDY has a promotive effect on the electrode performances and exhibits low detection limit and high sensitivity for 6,7-dihydroxycoumarin.
As a new type of carbon nanomaterial, graphdiyne (GDY) has unique sp hybridized carbon atom, which makes it possible to develop new nitrogen-doped configurations. In this paper, sp-hybridized nitrogen atom doped ultrathin graphdiyne (NUGDY) was prepared based on graphdiyne oxide and melamine by carbonization at high temperature. NUGDY not only preserves the typical folded and wrinkled two-dimensional morphology of GDY, but also presents a three-dimensional porous network structure, which provides sufficient interface and capacity for the loading of target analyte. Meanwhile, N doping increases the GDY defects with more active sites and higher conductivity. Then, NUGDY was modified on the surface of carbon ionic liquid electrode and the modified electrode was applied to 6,7-dihydroxycoumarin (6,7-DHC) analysis. Cyclic voltammetry, electrochemical impedance spectroscopy and chronocoulometry results show that NUGDY has good promotive effect to the electrode performances. Differential pulse voltammetric experiments show that this electrochemical sensor has a low detection limit as 2.3 nM (3S(0)/S) for 6,7-DHC with high sensitivity. In addition, the modified electrode has the characteristics of excellent anti-interference ability and stability, and been successfully used in the real samples determination, which provides a promising method for the sensitive detection of drug molecules.
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