Nanoscale -Quantum- Islands on Metal Substrates: Microscopy Studies and Electronic Structure AnalysesReportar como inadecuado


Nanoscale -Quantum- Islands on Metal Substrates: Microscopy Studies and Electronic Structure Analyses


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1

Institute of Physical Research & Technology, Iowa State University, Ames, IA 50011, USA

2

Ames Laboratory, Departments of Materials Science & Engineering and Chemistry, Iowa State University, Ames, IA 50011, USA

3

Ames Laboratory, Departments of Physics & Astronomy and Mathematics, Iowa State University, Ames, IA 50011, USA

4

Ames Laboratory, Iowa State University, Ames, IA 50011, USA





*

Author to whom correspondence should be addressed.



Abstract Confinement of electrons can occur in metal islands or in continuous films grown heteroepitaxially upon a substrate of a different metal or on a metallic alloy. Associated quantum size effects QSE can produce a significant height-dependence of the surface free energy for nanoscale thicknesses of up to 10–20 layers. This may suffice to induce height selection during film growth. Scanning STM analysis has revealed remarkable flat-topped or mesa-like island and film morphologies in various systems. We discuss in detail observations of QSE and associated film growth behavior for Pb-Cu111, Ag-Fe100, and Cu-fcc-Fe-Cu100 A-B or A-B-A, and for Ag-NiAl110 with brief comments offered for Fe-Cu3Au001 A-BC binary alloys. We also describe these issues for Ag-5-fold i-Al-Pd-Mn and Bi-5-fold i-Al-Cu-Fe A-BCD ternary icosohedral quasicrystals. Electronic structure theory analysis, either at the level of simple free electron gas models or more sophisticated Density Functional Theory calculations, can provide insight into the QSE-mediated thermodynamic driving force underlying height selection. View Full-Text

Keywords: quantum size effect; metal nanofilms; quantum islands; DFT calculations; STM; Ag-Fe; Cu-Fe-Cu; Pb-Cu; Ag-NiAl; films on quasicrystals quantum size effect; metal nanofilms; quantum islands; DFT calculations; STM; Ag-Fe; Cu-Fe-Cu; Pb-Cu; Ag-NiAl; films on quasicrystals





Autor: Yong Han 1,* , Bariş Ünal 2, Dapeng Jing 2, Patricia A. Thiel 2, James W. Evans 3 and Da-Jiang Liu 4

Fuente: http://mdpi.com/



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