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Failure Mechanisms in Vertically Aligned Dense Nanowire Arrays

Gallivan, Rebecca A. and Greer, Julia R. (2021) Failure Mechanisms in Vertically Aligned Dense Nanowire Arrays. Nano Letters, 21 (18). pp. 7542-7547. ISSN 1530-6984. doi:10.1021/acs.nanolett.1c01944.

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Nanowires are an increasingly prevalent class of nanomaterials in composites and devices, with arrays and other complex geometries used in various applications. Little investigation has been done regarding the mechanical behavior of micron-sized nanowire structures. We conduct in situ microcompression experiments on vertically aligned dense microbundles of 300 nm diameter single-crystalline zinc oxide nanowires to gain insights into their structural failure. Experiments demonstrate that bundles containing approximately 10–130 nanowires experience two failure regimes: (1) localized noncatastrophic interfacial splitting and (2) global structural failure. Utilizing Weibull statistics and experimental results, we develop a technique for analyzing flaw distribution and use it to predict the expected range of bundle failure stress. This analysis provides guidelines for nanowire arrays’ susceptibility to failure, sensitivity to flaw size, interfacial interactions of constituents, and degree of alignment. This work develops insights to understand and predict fundamental failure mechanisms in highly aligned, dense structures.

Item Type:Article
Related URLs:
URLURL TypeDescription
Gallivan, Rebecca A.0000-0001-6516-2180
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2021 American Chemical Society. Received: May 19, 2021; Published: September 10, 2021. The authors would like to thank the Kavli Nanoscience Institute for use of their facilities in fabricating substrates, Dr. Max L. Lifson for his help in creating the nanowire growth apparatus, and Dr. Haolu Zhang for her helpful discussions. The authors would like to acknowledge funding support from the DOE QIS program (de-sc0019166). Author Contributions: R.A.G. and J.R.G. conceived of the experiments and model. R.A.G. synthesized samples, performed experiments, analyzed data, and formulated application of the model. Both authors contributed to writing the manuscript and have given approval to the final version of the manuscript. The authors declare no competing financial interest.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0019166
Subject Keywords:failure; nanowires; interfaces; microcompression in situ nanomechanics; zinc oxide
Issue or Number:18
Record Number:CaltechAUTHORS:20210917-215613610
Persistent URL:
Official Citation:Failure Mechanisms in Vertically Aligned Dense Nanowire Arrays. Rebecca A. Gallivan and Julia R. Greer. Nano Letters 2021 21 (18), 7542-7547; DOI: 10.1021/acs.nanolett.1c01944
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110948
Deposited By: George Porter
Deposited On:20 Sep 2021 14:46
Last Modified:04 Oct 2021 17:47

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