Diazonium based surface functionalization of graphite  by electrochemical grafting

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

doi:10.51316/jca.2020.040

Authors

Vo Thi Thuy Hang Faculty of Natural Science – Quy Nhon University Author
Nguyen Duy Dien Faculty of Natural Science – Quy Nhon University Author
Tran The Thi Faculty of Natural Science – Quy Nhon University Author
Huynh Thi Mien Trung Faculty of Natural Science – Quy Nhon University Author
Phan Thanh Hai Faculty of Natural Science – Quy Nhon University Author

DOI:

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

Keywords:

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

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.

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