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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing
Published on: June 1, 2012
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Lignin-silver triggered multifunctional conductive hydrogels for skinlike sensor applications.
Yanping Hao1, Chao Wang1, Weikun Jiang1
1State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, Shandong 250353, China.
International Journal of Biological Macromolecules
|September 16, 2022
Summary
Researchers developed a highly stretchable and conductive nanocomposite hydrogel using cellulose, lignosulfonate-silver, and poly(acrylamide). This material demonstrates self-recovery, adhesion, UV resistance, and antibacterial properties for advanced wearable epidermal sensors and bioelectrodes.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Conductive hydrogels are crucial for wearable devices and body monitoring due to their flexibility and stretchability.
- Developing advanced hydrogels with multifunctional properties remains a key challenge in materials science.
Purpose of the Study:
- To synthesize a multifunctional nanocomposite hydrogel with enhanced mechanical, conductive, and protective properties.
- To explore the high-value utilization of lignin in advanced material applications.
Main Methods:
- Radical polymerization was employed to create a cellulose nanocrystal @sodium lignosulfonate-silver-poly(acrylamide) nanocomposite hydrogel.
- Dynamic catalysis using lignosulfonate-silver (Ls-Ag) and ammonium persulfate (APS) accelerated the polymerization process.
Main Results:
- The hydrogel exhibited excellent tensile strength (406 kPa), ultrahigh stretchability (1880%), self-recovery, and fatigue resistance.
- The composite hydrogel demonstrated strong adhesion, conductivity (9.5 mS cm⁻¹), 100% UV shielding, and high antibacterial activity (>98%).
- A sensor fabricated from the hydrogel showed high sensitivity (gauge factor 2.46) and was used for monitoring human movement and collecting biological signals (electromyography, electrocardiography).
Conclusions:
- The study presents a novel, rapidly synthesized nanocomposite hydrogel with superior properties for wearable electronics.
- This work highlights a promising strategy for lignin valorization, with significant potential in fields like wearable bioelectrodes and epidermal sensing.
