Effects of L-serine amino acid functionalization on electronic properties of a graphene plane in comparison with oxygen functionalization

被引:0
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作者
Kittiya Prasert
Thana Sutthibutpong
机构
[1] King Mongkut’s University of Technology Thonburi,Theoretical and Computational Physics Group, Department of Physics, Faculty of Science
[2] King Mongkut’s University of Technology Thonburi (KMUTT),Theoretical and Computational Science Center (TaCS), Science Laboratory Building, Faculty of Science
来源
Journal of Molecular Modeling | 2020年 / 26卷
关键词
Density functional theory ; Graphene functionalization ; Electronic structure;
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摘要
The effects of L-serine amino acid functionalization on a graphene plane were investigated through density functional theory calculations compared with those of oxygen functionalization. Three systems of 4 × 4 graphene supercells were created and functionalized by an epoxy group, a hydroxyl group, and an L-serine molecule. From the geometry optimization of the system containing a 4 × 4 graphene supercell and an L-serine molecule, it was found that a by-product hydroxyl group was formed by the dissociation of the −OH from the parental −COOH group and two covalent bonds forming at a couple of adjacent atoms on the graphene plane. The adsorption energy of the L-serine functionalization was weaker than that of the epoxy functionalization but was stronger than that of the hydroxyl functionalization. Electronic properties of this new L-serine functionalization were similar to epoxy functionalization at low functionalization density, as the Dirac cone was preserved with shifted wave vector due to the double sp3 vacancies. The C2v type of two-fold symmetry was observed through the local density of states (LDOS) and the gamma-point HOMO electron density analysis. However, the improved binding surface area of serine-functionalized graphene was observed, as four polar groups emerged from a single functionalization. Therefore, serine functionalization is a promising way to improve the properties of graphene-based electrodes.
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