Modulation of the exfoliated graphene work function through cycloaddition of nitrile imines

After the feasibility of the 1,3-dipolar cycloaddition reaction between nitrile imines and exfoliated graphene by density functional theory calculations was proved, very few-layer graphene was effectively functionalized using this procedure. Hydrazones with different electronic properties were used...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2016, Vol.18 (42), p.29582-29590
Main Authors: Barrejón, Myriam, Gómez-Escalonilla, María J, Fierro, José Luis G, Prieto, Pilar, Carrillo, José R, Rodríguez, Antonio M, Abellán, Gonzalo, López-Escalante, Ma Cruz, Gabás, Mercedes, López-Navarrete, Juan T, Langa, Fernando
Format: Article
Language:English
Subjects:
Cycloaddition
Electronics
Graphene
Imines
Nitriles
Photoelectron spectroscopy
Work functions
X-ray photoelectron spectroscopy
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Summary:After the feasibility of the 1,3-dipolar cycloaddition reaction between nitrile imines and exfoliated graphene by density functional theory calculations was proved, very few-layer graphene was effectively functionalized using this procedure. Hydrazones with different electronic properties were used as precursors for the 1,3-dipoles, and microwave irradiation as an energy source enabled the reaction to be performed in a few minutes. The anchoring of organic addends on the graphene surface was confirmed by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis. Ultraviolet photoelectron spectroscopy (UPS) was used to measure the work function and band gap of these new hybrids. Our results demonstrate that it is possible to modulate these important electronic valence band parameters by tailoring the electron richness of the organic addends and/or the degree of functionalization.
ISSN:1463-9076
1463-9084
DOI:10.1039/c6cp05285a