Directional Ostwald Ripening for Producing Aligned Arrays of Nanowires

Title
Directional Ostwald Ripening for Producing Aligned Arrays of Nanowires
Authors
최원준이혜진양유정김경남박수진길계형김정수Alec M. Wodtke김명화백정민
Issue Date
2019-07
Publisher
Nano letters
Citation
VOL 19, NO 7-4313
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.
URI
http://pubs.kist.re.kr/handle/201004/69529
ISSN
1530-6984
Appears in Collections:
KIST Publication > Article
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