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Materials 2017, 10(9), 1056; doi:10.3390/ma10091056

Self-Assembled Gold Nano-Ripple Formation by Gas Cluster Ion Beam Bombardment

1
Department of Physics and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Rd, Houston, TX 77204, USA
2
Department of Physics and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
*
Author to whom correspondence should be addressed.
Received: 16 August 2017 / Revised: 6 September 2017 / Accepted: 6 September 2017 / Published: 8 September 2017
(This article belongs to the Special Issue Ion Beam Analysis, Modification, and Irradiation of Materials)
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Abstract

In this study, we used a 30 keV argon cluster ion beam bombardment to investigate the dynamic processes during nano-ripple formation on gold surfaces. Atomic force microscope analysis shows that the gold surface has maximum roughness at an incident angle of 60° from the surface normal; moreover, at this angle, and for an applied fluence of 3 × 1016 clusters/cm2, the aspect ratio of the nano-ripple pattern is in the range of ~50%. Rutherford backscattering spectrometry analysis reveals a formation of a surface gradient due to prolonged gas cluster ion bombardment, although the surface roughness remains consistent throughout the bombarded surface area. As a result, significant mass redistribution is triggered by gas cluster ion beam bombardment at room temperature. Where mass redistribution is responsible for nano-ripple formation, the surface erosion process refines the formed nano-ripple structures. View Full-Text
Keywords: ion-solid interaction; cluster ion beam; nano-ripples ion-solid interaction; cluster ion beam; nano-ripples
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tilakaratne, B.P.; Chen, Q.Y.; Chu, W.-K. Self-Assembled Gold Nano-Ripple Formation by Gas Cluster Ion Beam Bombardment. Materials 2017, 10, 1056.

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