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

Abstract

Spiders synthesize their web using a liquid bridgeto-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 NO 2 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.

A Simple Method to Fabricate the Highly Sensitive SERS Substrate by Femtosecond Laser-Based 3D Printer

“…Because we used the CV molecules (fluorescence dye) for investigation, the 785 nm laser is suitable for decreasing fluorescence interference. A 10× microscope lens (Leica DM2700M, DEU) and detector (Renishaw Centrus Detector, GBR) were used for analysis [1,29].…”

Two-Dimensional Piezoelectric Nanofibrous Webs by Self-Polarized Assembly for High-Performance PM0.3 Filtration

“…structures are proposed to solve the problems. 25,26 The fibrous webs endow air filtration materials with interconnected fibers, small pores, and thin thickness, which greatly improves efficiency and permeability. Generally, different kinds of technologies have been presented to develop filters based on fibrous web-like structures.…”

Detection of Chlorpyrifos Using Bio-Inspired Silver Nanograss

“…Moreover, waterproof paint from the lotus leaf effect, artificial fibers from the spider silk, adhesive surface from the gecko foot surface, and adhesive materials in water from mussels are famous examples of bio-inspired technology [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. As a part of biomimetic technology, we previously developed an artificial microfiber that mimicked a spider’s web and nano pine pollen that mimicked pine pollen [ 10 , 11 ]. Through previous works, we recognized that the biomimicked nanostructure has advantages in the SERS sensing platform especially.…”