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  Directional Ostwald ripening for producing aligned arrays of nanowires.

Lee, H. J., Yang, U. J., Kim, K. N., Park, S., Kil, K. H., Kim, J. S., et al. (2019). Directional Ostwald ripening for producing aligned arrays of nanowires. Nano Letters, 19(7), 4306-4313. doi:10.1021/acs.nanolett.9b00684.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-CD9A-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-438C-3
Genre: Journal Article

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 Creators:
Lee, H. J., Author
Yang, U. J., Author
Kim, K. N., Author
Park, S., Author
Kil, K. H., Author
Kim, J. S., Author
Wodtke, A. M.1, Author              
Choi, W. J., Author
Kim, M. H., Author
Baik, J. M., Author
Affiliations:
1Department of Dynamics at Surfaces, MPI for biophysical chemistry, Max Planck Society, ou_578600              

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Free keywords: Lennard−Jones potential; VO nanowires; directional Ostwald ripening; self-aligned; strain sensors
 Abstract: The remarkable electronic and mechanical properties of nanowires have great potential for fascinating applications; however, the difficulties of assembling ordered arrays of aligned nanowires over large areas prevent their integration into many practical devices. In this paper, we show that aligned VO2 nanowires form spontaneously after heating a thin V2O5 film on a grooved SiO2 surface. Nanowires grow after complete dewetting of the film, after which there is the formation of supercooled nanodroplets and subsequent Ostwald ripening and coalescence. We investigate the growth mechanism using molecular dynamics simulations of spherical Lennard-Jones particles, and the simulations help explain how the grooved surface produces aligned nanowires. Using this simple synthesis approach, we produce self-aligned, millimeter-long nanowire arrays with uniform metal-insulator transition properties; after their transfer to a polymer substrate, the nanowires act as a highly sensitive array of strain sensors with a very fast response time of several tens of milliseconds.

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Language(s): eng - English
 Dates: 2019-06-072019-06-07
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.nanolett.9b00684
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Title: Nano Letters
Source Genre: Journal
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Pages: - Volume / Issue: 19 (7) Sequence Number: - Start / End Page: 4306 - 4313 Identifier: -