Journal of Molecular Modeling

, Volume 18, Issue 8, pp 3887–3902

Architectures, electronic structures, and stabilities of Cu-doped Gen clusters: density functional modeling

Original Paper

DOI: 10.1007/s00894-012-1374-7

Cite this article as:
Bandyopadhyay, D. J Mol Model (2012) 18: 3887. doi:10.1007/s00894-012-1374-7

Abstract

The present study reports the geometries, electronic structures, growth behavior, and stabilities of neutral and ionized copper-doped germanium clusters containing 1–20 Ge atoms within the framework of linear combination of atomic orbitals density functional theory (DFT) under the spin-polarized generalized gradient approximation. It was found that Cu-capped Gen (or Cu-substituted Gen+1) and Cu-encapsulated Gen clusters mostly occur in the ground state at a particular cluster size (n). In order to explain the relative stabilities of the ground-state clusters, parameters such as the average binding energy per atom (BE), the embedding energy (EE), and the fragmentation energy (FE) of the clusters were calculated, and the resulting values are discussed. To explain the chemical stabilities of the clusters, parameters such as the energy gap between the highest occupied and the lowest unoccupied molecular orbitals (the HOMO–LUMO gap), the ionization energy (IP), the electron affinity (EA), the chemical potential (μ), the chemical hardness (η), and the polarizability were calculated, and the resulting values are also discussed. Natural atomic orbital (NAO) and natural bond orbital (NBO) analyses were also used to determine the electron-counting rule that should be applied to the most stable Ge10Cu cluster. Finally, the relevance of the calculated results to the design of Ge-based superatoms is discussed.

https://static-content.springer.com/image/art%3A10.1007%2Fs00894-012-1374-7/MediaObjects/894_2012_1374_Figa_HTML.gifhttps://static-content.springer.com/image/art%3A10.1007%2Fs00894-012-1374-7/MediaObjects/894_2012_1374_Figb_HTML.gif
Figure

Contributions of the valance orbitals of the Ge and Cu atom(s) to the HOMO of the ground-state icosahedral Ge10Cu cluster obtained from NBO analysis. The numbers below the clusters represent the occupancies of the HOMO orbitals

Keywords

Clusters and nanoclustersBinding energyDensity functional theoryElectron affinityEmbedding energyIonization potential

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Physics DepartmentBirla Institute of Technology and SciencePilaniIndia