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Nanostructures from Hydrogen and Helium Implantation of Aluminum

Published online by Cambridge University Press:  01 February 2011

Markus D. Ong ,
Nancy Yang ,
Ryan J. Depuit ,
Bruce R. McWatters  and
Rion A. Causey
Markus D. Ong
Affiliation:
mong@sandia.gov, Sandia National Laboratories, Energy Nanomaterials, Livermore, California, United States
Nancy Yang
Affiliation:
nyyang@sandia.gov, Sandia National Laboratories, Energy Nanomaterials, Livermore, California, United States
Ryan J. Depuit
Affiliation:
rdepuit@engineering.ucsb.edu, University of California, Santa Barbara, Chemical Engineering, Santa Barbara, California, United States
Bruce R. McWatters
Affiliation:
brmcwat@sandia.gov, Sandia National Laboratories, Radiation-Solid Interactions, Albuquerque, New Mexico, United States
Rion A. Causey
Affiliation:
causey@sandia.gov, Sandia National Laboratories, Energy Nanomaterials, Livermore, California, United States
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Abstract

This study investigates a pathway to nanoporous structures created by hydrogen and helium implantation in aluminum. Previous experiments for fusion applications have indicated that hydrogen and helium ion implantations are capable of producing bicontinuous nanoporous structures in a variety of metals. This study focuses specifically on implantations of hydrogen and helium ions at 25 keV in aluminum. The hydrogen and helium systems result in remarkably different nanostructures of aluminum at the surface. Scanning electron microscopy, focused ion beam, and transmission electron microscopy show that both implantations result in porosity that persists approximately 200 nm deep. However, hydrogen implantations tend to produce larger and more irregular voids that preferentially reside at defects. Implantations of helium at a fluence of 1018 cm-2 produce much smaller porosity on the order of 10 nm that is regular and creates a bicontinuous structure in the porous region. The primary difference driving the formation of the contrasting structures is likely the relatively high mobility of hydrogen and the ability of hydrogen to form alanes that are capable of desorbing and etching Al (111) faces.

Keywords

ion-implantationnanostructureAl
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1264: Symposia Z/BB – Basic Actinide Science and Materials for Nuclear Applications , 2010 , 1264-BB03-05
Copyright
Copyright © Materials Research Society 2010

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