Self-Attachable and Conductive Hydrogel Adhesive Patch

Lee S, Choi G, et al.

Nano Select

Ulsan National Institute of Science and Technology (UNIST)

RESEARCH SUMMARY

This work presents a multifunctional hydrogel patch composed of polyethylene glycol dimethacrylate (PEGDMA) and PEDOT:PSS, featuring mushroom-shaped micropillars inspired by biological adhesive structures. The composite hydrogel achieves strong, reversible adhesion on both dry (129 kPa) and wet (116 kPa) surfaces, retaining performance over 300 cycles while maintaining high electrical conductivity (25.5 S/m) and Joule heating capability. Its micropillar geometry enables conformal contact with irregular surfaces, making it suitable for wearable sensors, flexible heaters, and soft bioelectronic patches.

Uniaxial tensile testing of PEGDMA/PEDOT:PSS (PEG‑PP) hydrogels was performed using a CellScale UniVert universal testing machine (Waterloo, ON, Canada) equipped with a 200 N load cell. Rectangular hydrogel specimens (30 mm × 15 mm × 0.4 mm) were tested at 0.5 mm s⁻¹ strain rate. The stress–strain response was used to calculate the elastic modulus within 0–5 % strain, demonstrating that increasing PEDOT:PSS content (0–30 wt%) raised stiffness from ~3 MPa to >10 MPa without loss of flexibility.

AUTHORS

Sang-Woo Lee; Geonjun Choi; Jaeil Kim; Seongjin Park; Somi Kim; Junghwa Kang; Salah M. Tawfik; Hoon Eui Jeong.

PUBLICATION DETAILS

JOURNAL

Nano Select

YEAR

2025

INSTITUTIONS

Ulsan National Institute of Science and Technology (UNIST)

COUNTRIES

South Korea

INSTRUMENT USED

UniVert

TESTING METHODS

Tensile Testing

RESEARCH APPLICATIONS

Adhesives and Sealants TestingElectroactive and Photothermal PolymersHydrogel Mechanical TestingMaterial Fatigue and DurabilityPolymers and Elastomers TestingWearable Bioelectronics

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