1. Double-sided F and Cl adsorptions on graphene at various atomic ratios: Geometric, orientation and electronic structure aspects
- Author
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Zhong-Tao Jiang, Bogdan Z. Dlugogorski, Bee Min Goh, Amun Amri, Hantarto Widjaja, Chun-Yang Yin, Mohammednoor Altarawneh, and Nicholas Mondinos
- Subjects
Dopant ,Condensed matter physics ,Chemistry ,Graphene ,Band gap ,General Physics and Astronomy ,Fermi energy ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,Electronic structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,law.invention ,Magnetization ,Adsorption ,law ,Physical chemistry ,Density functional theory ,0210 nano-technology - Abstract
Elemental adsorption on graphene offers an effective procedure in fine-tuning electronic and mechanical properties of graphene. The effects of dopants depend on adsorption site, the degree of coverage as well as on the configuration of the deployed supercell. In this contribution, the density functional theory (DFT) calculations were performed to investigate the electronic structures of F and Cl adsorption (double-sided, top site) on graphene in terms of adsorption orientation, atomic ratios, i.e., from C:F/Cl = 18:2 to C:F/Cl = 2:2. Despite being members of the halogens group, F- and Cl-adsorbed on graphene show contrasting trends. F is adsorbed to graphene more strongly than Cl. F favours full and 25% adsorption coverage, while Cl favours 25% coverage. Both F and Cl cases open band gap (at Fermi energy) at certain atomic concentration coverage, but none creates magnetization.
- Published
- 2016