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Size effect on the melting point and E-4f level shift of gold nanosolid
Sun Changqing 1 * #, H. L. Bai 2,S. Li 1,B. K. Tay 1,E. Y. Jiang 2
1.Nanyang Technological University
2.Tianjin University
*Correspondence author
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Funding: none
Opened online: 5 August 2005
Accepted by: none
Citation: Sun Changqing, H. L. Bai,S. Li.Size effect on the melting point and E-4f level shift of gold nanosolid[OL]. [ 5 August 2005] http://en.paper.edu.cn/en_releasepaper/content/2607
 
 
onsistent insight into the size-enhanced E4f-level shift and the size-suppressed melting point of Au nanosolids has been obtained based on the bond order-length-strength (BOLS) correlation mechanism [Sun, et al, Acta Materialia 51, 4631 (2003)]. Consistency between theory predictions and observations reveals that the atomic-coordination number (CN) imperfection induced bond contraction and the associated bond-energy increase dictate these changes. The increase of binding energy density per unit volume in the relaxed surface region perturbs the Hamiltonian that determines the core level shift; the decrease of atomic cohesive energy (a product of atomic CN and the single bond energy) determines the thermal energy required for melting. Extending the knowledge to the lower end of the size limit suggests that the metallic bond in the gold monatomic-chain contracts by ~30% associated with ~43% magnitude rise of the bond energy. The crystal binding intensity contributing from all the atoms i
Keywords:nanostructure; electronic structure; thermal stability; mechanical strength
 
 
 

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