Electronic and geometric structure of AuxCuy clusters studied by density functional theory

Date

2014-06-01

Author

KADIOĞLU, YELDA
AKTÜRK, OLCAY ÜZENGİ
Tomak, Mehmet

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We have determined the stable structures of AuCun, Au2Cun, Au3Cun and AuxCu8-x clusters. It has been observed that AuCun, Au2Cun and Au3Cun systems have two-dimensional (2D) structures up to six atoms and they become three-dimensional (3D) afterwards. AuxCu8-x clusters favor 3D structures till the Au7Cu1 cluster. We have found a lowest energy isomer of Au6Cu2 from the literature. Bond lengths, binding energies, density of states (DOS), highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gaps, ionization potential (IP) and electron affinity (EA) have been calculated for these structures using the first principles density functional theory (DFT) within the generalized gradient approximation (GGA) and the local density approximation (LDA). Generally, we have observed the overlap between s electrons of Cu and p electrons of Au near the Fermi level. Charge transfers are calculated by using the Lowdin analysis. It is observed that one Cu atom does not significantly modify the clusters which have more gold atoms. It is also seen that these clusters generally have nonmagnetic properties and results are consistent with the hybridization between s and d orbitals of Au in AuxCu8 (x) clusters.

Subject Keywords

Nanocluster, Electronic properties of clusters, Total energy and cohesive energy calculations (binding energy), Electron affinity, Bond lengths, Ionization potential, Density functional theory

URI

https://hdl.handle.net/11511/37353

Journal

INTERNATIONAL JOURNAL OF MODERN PHYSICS C

DOI

https://doi.org/10.1142/s0129183114500119

Collections

Department of Physics, Article

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Citation Formats

Y. KADIOĞLU, O. Ü. AKTÜRK, and M. Tomak, “Electronic and geometric structure of AuxCuy clusters studied by density functional theory,” INTERNATIONAL JOURNAL OF MODERN PHYSICS C, pp. 0–0, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37353.