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

Area of Science:

• Materials Science
• Biomimetics
• Nanotechnology

Background:

• Spiders utilize a unique liquid-to-solid transition mechanism for web synthesis.
• This biological process inspires the development of novel synthetic materials.
• Understanding these mechanisms is key to creating advanced biomimetic materials.

Purpose of the Study:

• To fabricate and characterize polymer microwires (μGTs) inspired by spider silk.
• To investigate the mechanical, chemical, and physical properties of the fabricated μGTs.
• To explore the potential of μGTs in sensing applications.

Main Methods:

• Fabrication of micro-glue threads (μGTs) using a simple "pinch and spread" technique.
• Characterization of μGTs' tensile strength, chemical, physical, and mechanical properties.
• Modification of μGTs with nanomaterials (gold nanoparticles, ZnO nanowires, rGO) for electrical conductivity.
• Assessment of conductive μGTs for NO2 gas sensing and humidity-responsive electrical fuse applications.

Main Results:

• μGTs demonstrated excellent tensile strength (∼50 GPa), comparable to spider silk.
• Microwire thickness was controllable via ethanol treatment.
• Electrically conductive μGTs were successfully fabricated using various nanomaterials.
• rGO-based conductive μGTs exhibited significant electrical conductivity (0.45 μS).
• Conductive μGTs showed potential for NO2 gas sensing and humidity-responsive applications.

Conclusions:

• Micro-glue threads (μGTs) are cost-effective, simple, and versatile materials.
• The biomimetic approach yields high-performance polymer microwires.
• μGTs offer promising applications in diverse sensor technologies.