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Structural and electronic properties of carbon adsorbed on Fe(100)

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Abstract

Density functional theory within general gradient approximation (GGA) has been used to investigate sub-monolayer carbon atom adsorbed on Fe(100) as a function of coverage. The carbon atoms prefer to adsorb in the fourfold hollow site and bind strongly with the Fe surfaces. There is a substantial and strong coverage dependence of the carbon-induced expansion of the first interlayer spacing, reflecting a weakening of Fe–Fe bonds between the two outermost substrate layers. Some charge is found to transfer from substrate Fe to the adsorbate C atoms, which is responsible for the increase of work function. The density of states (DOS) analysis indicates the bonding of carbon with the first surface layer Fe atoms is primarily due to the interaction between Fe 3dx2-y2, xy and C 2px, y orbitals, and the bonding of carbon with the second surface layer Fe atom that sits directly below the carbon atom is mainly from interaction between the minority spin Fe 3dz2 and C 2pz orbitals.

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Authors and Affiliations

  1. School of Material Science and Engineering, Central South University, 410083, Changsha, P.R. China

    X. Tan, J. Zhou, F. Liu, Y. Peng & B. Zhao

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  1. X. Tan
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  2. J. Zhou
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  3. F. Liu
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  4. Y. Peng
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  5. B. Zhao
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Correspondence to J. Zhou.

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Tan, X., Zhou, J., Liu, F. et al. Structural and electronic properties of carbon adsorbed on Fe(100). Eur. Phys. J. B 74, 555–564 (2010). https://doi.org/10.1140/epjb/e2010-00111-9

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  • DOI: https://doi.org/10.1140/epjb/e2010-00111-9

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