Open AccessDiazonium based surface functionalization of graphite by electrochemical grafting
Author(s) -
Vo Thi Thuy Hang,
Nguyen Duy Dien,
Tran The Thi,
Huynh Thi Mien Trung,
Thanh Hai Phan
Publication year - 2020
Publication title -
vietnam journal of catalysis and adsorption
Language(s) - English
Resource type - Journals
ISSN - 0866-7411
DOI - 10.51316/jca.2020.040
Subject(s) - surface modification , highly oriented pyrolytic graphite , raman spectroscopy , materials science , cyclic voltammetry , covalent bond , graphite , pyrolytic carbon , grafting , electrochemistry , x ray photoelectron spectroscopy , tetrafluoroborate , chemical engineering , polymer chemistry , nanotechnology , chemistry , electrode , organic chemistry , composite material , polymer , catalysis , optics , physics , ionic liquid , pyrolysis , engineering
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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