Highly Stretchable PEDOT Ink for Flexible Bioelectronics, 100 g/bottle, CFBHSPEDOTI

Pristine PEDOT:PSS films are brittle, with an elastic fracture strain typically below 5% and a high Young’s modulus (E >1–2 GPa). To bridge the mechanical mismatch with dynamic biological tissues (E ~ 1 kPa–100 kPa, strains >20–50%), stretchable PEDOT inks combine molecular plasticization, soft-matrix phase separation, and rheology tailoring for direct-write printing, inkjet, or screen printing.

Achieving stretchability without sacrificing electronic conductivity relies on disrupting rigid, ionic PEDOT:PSS grain boundaries: (1) Non-Ionic Plasticizers & Surfactants: Compounds: Triton X-100, Zonyl, Dynol, Sorbitol, PEG/PEO oligomers. Screen the strong electrostatic crosslinking between PEDOT+ and PSS-, lowering the glass transition temperature (Tg) and enabling polymer chain slipping under tensile strain. (2) Ionic Liquid (IL) / Deep Eutectic Softening: Compounds: 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]), [BMIM][OTf], or choline chloride/urea systems. Induces secondary doping while acting as an non-volatile liquid phase within the matrix, providing stretchability up to 100% with minimal resistance drift. (3) Elastomeric/Hydrogel Blending & Semi-IPNs: Compounds: Waterborne polyurethane (WPU), polydimethylsiloxane (PDMS) emulsions, poly(acrylic acid) (PAA), or polyacrylamide (PAAm). Forms a bicontinuous, semi-interpenetrating polymer network (semi-IPN) where the elastomer dissipates mechanical energy under elongation while the PEDOT fibrillar mesh preserves the electrical pathway.

The key requirements for PEDOT applied in bioelectronic interface are: (1) Electrochemical Impedance at the Bio-Interface: Conductive PEDOT networks must retain low interfacial charge transfer impedance even when strained, ensuring high signal-to-noise ratio (SNR) for biopotential sensing (EMG, ECG, single-unit neural spikes). (2) Cytotoxicity & Biocompatibility: Many high-performance secondary dopants and surfactants (e.g., concentrated fluoro-containing ionic liquids, harsh crosslinkers) are cytotoxic. Formulations intended for chronic implants or epidermal patches must substitute these with biocompatible alternatives like choline-amino acid ionic liquids, hyaluronic acid, or functionalized bio-compatible crosslinkers (e.g., (3-glycidyloxypropyl)trimethoxysilane / GOPS at low wt%). (3) Electromechanical Fatigue Resistance: Under cyclic physiological strain (e.g., cardiac beating ~10–20% or joint flexion up to 50%), microcracks can nucleate in the conductive phase. Utilizing self-healing motifs (hydrogen-bonded domains or dynamic disulfide linkages) helps recover baseline resistance across thousands of extension-relaxation cycles.

Part Number	CFBHSPEDOTI (C-FB-HSPEDOTI)
CAS	126213-51-2
Chemical Formula/Structure
Coating Thickness	<2 um
Stretch Rate	20-30 %
Resistance Change under 100% Stretch Rate	200 %
Stretch Loading	5-10 N
Water Resistance	No change after 72 h water immersion experiment
Adhesivity on TPU	Excellent
Square Resistance	150/50 Ω/sq
Viscosity	(1) Low Viscosity: 200-400 cP, which is good for tape cast coating, spin coating, and spray coating  (2) High Viscosity: >5000 cP, which is good for screen print and dispensing
Package Size	100 g/bottle

Notes: Please try to store the PEDOT dispersion in a dry and cold place (glovebox with fridge is the best option). 

References: 

1. H. Sun, et al. Highly Stretchable, Adhesive, and Conductive PEDOT Nanocomposite Hydrogels for High-Performance Flexible Bioelectronics, Adv. Sci., 2025, 12, e13487.
2. W. Li, et al. PEDOT-based stretchable optoelectronic materials and devices for bioelectronic interfaces, Chem. Soc. Rev. (2024) 53 (21): 10575–10603.