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Generating Nanoscale Arrays Using Self-Organized Porous-Alumina Ion Implantation Masks

Published online by Cambridge University Press:  15 February 2011

L. E. Rehn ,
R. C. Birtcher ,
B. J. Kestel ,
P. M. Baldo ,
J. Hiller  and
A.W. McCormick
L. E. Rehn
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
R. C. Birtcher
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
B. J. Kestel
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
P. M. Baldo
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
J. Hiller
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
A.W. McCormick
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
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Abstract

Starting from two-step anodizing recipes available in the literature, we fabricated selfsupporting ordered ion-implantation masks that are several mm2 in area and 1-4 νm thick. SEM micrographs reveal self-organized structures with straight open pores, 25-150 nm in diameter, extending completely through the mask. As reported previously, the pore diameter and spacing depend critically upon the anodization parameters, e.g., type of acid and its molality, the applied voltage and the solution temperature. Ion-milling procedures were developed for opening the bottoms of the anodized pores. These masks appear quite robust during exposure to ion beams of 1-MeV He, Ne, and Kr. The steps necessary to fabricate the implantation masks, including opening the pores, are briefly described. Here we present new results obtained with a mask fabricated with pore dimensions as small as 25 nm in diameter, i.e., at the limit of what is technically feasible. Measurements are reported of the angular dependence of the transmitted ion current; these results are consistent with the physical dimensions of the opened pores. TEM images of a partial array obtained by implantation through the 25-nm pores are also shown.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 777: Symposium A – Nanostructuring Materials with Energetic Beams , 2003 , T2.2
Copyright
Copyright © Materials Research Society 2003

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References

references

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