Assembly and densification of nanowire arrays via shrinkage

Jaehoon Bang, Jonghyun Choi, Fan Xia, Sun Sang Kwon, Ali Ashraf, Won Il Park, SungWoo Nam

Research output: Contribution to journalArticle


Chemically synthesized semiconductor nanowires (NWs) have demonstrated substantial promise for nanoelectronics, nanoenergy, and nanobiotechnology, but the lack of an effective and controllable assembly process has limited the wide adoption of NWs in these areas. Here we demonstrate a facile, robust, and controllable approach to assembling and densifying a parallel array of NWs using shrinkable shape memory polymers. Using thermal-induced shrinkage of polystyrene, we were able to successfully assemble and densify NW arrays up to close-packing and, furthermore, achieve tunable density (up to ∼300% amplification of density) by controlling the shrinkage process. We also demonstrate scalable assembly and densification of NWs on a 2.5 × 6 inch scale to explore the manufacturability of the shrink-induced assembly process. Finally, we demonstrate the successful transfer of the shrink-assembled NW arrays onto various 2-dimensional and 3-dimensional substrates without compromising the integrity of NW assembly and density.

Original languageEnglish (US)
Pages (from-to)3304-3308
Number of pages5
JournalNano letters
Issue number6
StatePublished - Jun 11 2014


  • Nanowire
  • assembly
  • shape memory polymer
  • shrinkage
  • transfer

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Bang, J., Choi, J., Xia, F., Kwon, S. S., Ashraf, A., Park, W. I., & Nam, S. (2014). Assembly and densification of nanowire arrays via shrinkage. Nano letters, 14(6), 3304-3308.