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Open AccessArticle

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

Department of Physics and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Rd, Houston, TX 77204, USA
Department of Physics and Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
Author to whom correspondence should be addressed.
Materials 2017, 10(9), 1056;
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)
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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MDPI and ACS Style

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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