Diazonium based surface functionalization of graphite by electrochemical grafting

Hang Vo Thi Thuy, Dien Nguyen Duy, Thi Tran The, Trung Huynh Thi Mien, Hai Phan Thanh

Abstract


In this respect, a combination of cyclic voltammetry (CV), Raman spectroscopy, and Atomic Force Microscopy (AFM) is employed to characterize the structural, electrochemical and electronic properties of diazonium thin layers covalently functionalized highly oriented pyrolytic graphite (HOPG) surface. As a consequence, a grafted layer thin film of 4-nitro-benzene-diazonium tetrafluoroborate (4-NBD) is formed on HOPG surface with an average thickness of about 3.5 ± 0.2 nm. A D-band peak appearrance at the wave length of 1336 cm-1 on the Raman spectrum indicates an enhancing of defects caused by covalent C-C bonds. A tentative model illustrating the formation of 4-NBD grafted multilayer governed by the dendritic mechanism is also proposed. This finding opens a new approach to control the degree of functionalization of graphitic surfaces and other 2D materials.


Keywords


Electrochemical grafting; graphitic surfaces; cyclic voltammetry; Raman spectroscopy; atomic force microscopy

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References


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DOI: https://doi.org/10.51316/jca.2020.040

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