Directional Ostwald Ripening for Producing Aligned Arrays of Nanowires

Hye Jin Lee, U. Jeong Yang, Kyeong Nam Kim, Soojin Park, Kye Hyoung Kil, Jun Soo Kim, Alec M. Wodtke, Won Jun Choi, Myung Hwa Kim, Jeong Min Baik

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

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.

Original languageEnglish
Pages (from-to)4306-4313
Number of pages8
JournalNano Letters
Volume19
Issue number7
DOIs
StatePublished - 10 Jul 2019

Keywords

  • Lennard-Jones potential
  • VO nanowires
  • directional Ostwald ripening
  • self-aligned
  • strain sensors

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