Bioinspired Micro Glue Threads Fabricated by Liquid Bridge-to-Solidification as an Effective Sensing Platform

Woong Kim, Wonseok Lee, Hyunsung Choi, Gyudo Lee, Jongsang Son, Sang Won Lee, Joohyung Park, Woochang Kim, Minwoo Kim, Dae Sung Yoon, Doyeon Bang, Sungsoo Na, Jinsung Park

Research output: Contribution to journalArticlepeer-review

Abstract

Spiders synthesize their web using a liquid bridge-to-solidification mechanism at the end of their glands. Inspired by this process, in this work, we fabricated micro-glue threads (μGTs, polymer microwires) by a simple "pinch and spread"process using just two fingertips. The μGTs exhibited excellent tensile strength (50 GPa), comparable to those of spider silk and biological fibers. The chemical, physical, and mechanical properties of the μGTs were investigated, and it was confirmed that the thickness of the μGTs could be controlled by ethanol treatment in varying concentrations. Moreover, electrically conductive μGTs were easily fabricated by simply mixing them with various nanomaterials such as gold nanoparticles, zinc oxide nanowires, and reduced graphene oxide (rGO). Interestingly, the conductive μGTs, fabricated using rGO, exhibited remarkable electrical conductivity (0.45 μS) compared to those fabricated using other materials. The conductive μGTs are applicable not only to NO2 gas sensing but also as electrical fuselike materials that melt when the humidity increases. Collectively, the results present μGTs as cost-effective, simple, and versatile materials, which enables their application in a variety of sensors.

Original languageEnglish
Pages (from-to)1977-1986
Number of pages10
JournalACS Sensors
Volume5
Issue number7
DOIs
Publication statusPublished - 2020 Jul 24

Keywords

  • biomimetics
  • conducting microwire
  • liquid bridge-to-solidification
  • micro glue threads
  • sensor

ASJC Scopus subject areas

  • Bioengineering
  • Instrumentation
  • Process Chemistry and Technology
  • Fluid Flow and Transfer Processes

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