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Issue 23, 2014
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Experimental realization of coexisting states of rolled-up and wrinkled nanomembranes by strain and etching control

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Abstract

Self-positioned nanomembranes, such as rolled-up tubes and wrinkled thin films, have been potential systems for a variety of applications and basic studies on elastic properties of nanometer-thick systems. Although there is a clear driving force towards elastic energy minimization in each system, the exploration of intermediate states, in which specific characteristics could be chosen by a slight modification of a processing parameter, have not been experimentally realized. In this work, arrays of freestanding III–V nanomembranes (NM) supported on one edge and presenting a coexistence of these two main behaviors were obtained by design of strain conditions in the NMs and controlled selective etching of patterned substrates. As the etching process continues, a mixture of wrinkled and rolled-up states is achieved. For very long etching times an onset of plastic cracks was observed in the points with localized stress. The well-defined morphological periodicity of the relaxed NMs was compared with finite element simulations of their elastic relaxation. The evolution of strain in the NMs with etching time was directly evaluated by X-ray diffraction, providing a comprehensive scenario of transitions among competing and coexisting strain states.

Graphical abstract: Experimental realization of coexisting states of rolled-up and wrinkled nanomembranes by strain and etching control

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Article information


Submitted
15 Jul 2014
Accepted
17 Sep 2014
First published
18 Sep 2014

Nanoscale, 2014,6, 14326-14335
Article type
Paper

Experimental realization of coexisting states of rolled-up and wrinkled nanomembranes by strain and etching control

P. Cendula, A. Malachias, Ch. Deneke, S. Kiravittaya and O. G. Schmidt, Nanoscale, 2014, 6, 14326
DOI: 10.1039/C4NR03986F

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