Microchannel Wetting for Controllable Patterning and Alignment of Silver Nanowire with High Resolution

Bo-Ru Yang, Cao Wu, Gui-Shi Liu, Hui-Jiuan Chen, Yong-Young Noh, Minari Takeo, Chih Hsiang Hsiao, Chia Yu Lee, Han-Ping Shieh, Chuan Yi Liu

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Patterning and alignment of conductive nanowires are essential for good electrical isolation and high conductivity in various applications. Herein a facile bottom-up, additive technique is developed to pattern and align silver nanowires (AgNWs) by manipulating wetting of dispersions in microchannels. By forming hydrophobic/hydrophilic micropatterns down to 8 mu m with fiuoropolymer (Cytop) and SiO2, the aqueous AgNW dispersions with the optimized surface tension and viscosity self-assemble into microdroplets and then dry to form anisotropic AgNW networks. The alignment degree characterized by the full width at half-maximum (FWHM) can be well-controlled from 39.8 degrees to 84.1 degrees by changing the width of microchannels. A mechanism is proposed and validated by statistical analysis on AgNW alignment, and a static model is proposed to guide the patterning of general NWs. The alignment reduced well the electrical resistivity of AgNW networks by a factor of 5 because of the formation of efficient percolation path for carrier conduction.
Original languageEnglish
Pages (from-to)21433-21441
Number of pages9
JournalACS applied materials & interfaces
Volume7
Issue number38
DOIs
StatePublished - 30 Sep 2015

Keywords

  • fluoropolymer; microchannel; self-assembly patterning; alignment; silver nanowires
  • CARBON NANOTUBES; THIN-FILM; TRANSPARENT; ARRAYS; NETWORKS; ELECTRODE; NANOSTRUCTURES; SIMULATION; CONDUCTORS; SURFACES

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