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. 2013 Aug 23;8(1):363. doi: 10.1186/1556-276X-8-363

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Copyright ©2013 Dar et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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SEM images of non-annealed (sample 1) and annealed samples (samples 2 and 3). (a) Cross-sectional and (b) top views of the as-prepared Ni NT (non-annealed sample 1 inside AAO template). (c) Wall thickening after 25-min annealing (sample 2). (d) The complete closure of walls yielding NR morphology after 300-min annealing (sample 3).