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.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) under grant nos. NRF-2017M3A9F1031229, NRF-2017R1E1A1A01075439, NRF-2016R1A5A1010148 and Korea Environment Industry & Technology Institute (KEITI) through its Ecological Imitation-based Environmental Pollution Management Technology Department Project and funded by the Korea Ministry of Environment (MOE 2019002800009).
Copyright © 2020 American Chemical Society.
- conducting microwire
- liquid bridge-to-solidification
- micro glue threads
ASJC Scopus subject areas
- Process Chemistry and Technology
- Fluid Flow and Transfer Processes