Micropatterning of metal nanoparticle ink by laser-induced thermocapillary flow

Sewoong Park, Jinhyeong Kwon, Jaemook Lim, Wooseop Shin, Younggeun Lee, Habeom Lee, Hyun Jong Kim, Seungyong Han, Junyeob Yeo, Seung Hwan Ko, Sukjoon Hong

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Selective laser sintering of metal nanoparticle ink is a low-temperature and non-vacuum technique developed for the fabrication of patterned metal layer on arbitrary substrates, but its application to a metal layer composed of large metal area with small voids is very much limited due to the increase in scanning time proportional to the metal pattern density. For the facile manufacturing of such metal layer, we introduce micropatterning of metal nanoparticle ink based on laser-induced thermocapillary flow as a complementary process to the previous selective laser sintering process for metal nanoparticle ink. By harnessing the shear flow of the solvent at large temperature gradient, the metal nanoparticles are selectively pushed away from the scanning path to create metal nanoparticle free trenches. These trenches are confirmed to be stable even after the complete process owing to the presence of the accompanying ridges as well as the bump created along the scanning path. As a representative example of a metal layer with large metal area and small voids, dark-field photomask with Alphabetic letters are firstly created by the proposed method and it is then demonstrated that the corresponding letters can be successfully reproduced on the screen by an achromatic lens.

Original languageEnglish
Article number645
JournalNanomaterials
Volume8
Issue number9
DOIs
StatePublished - Sep 2018

Keywords

  • Laser-induced thermocapillary flow
  • Metal nanoparticle ink
  • Selective laser sintering

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