All-Organic Conductive Biomaterial as an Electroactive Cell Interface.

Area of Science:

• Bioelectronics
• Materials Science
• Biocompatible Materials

Background:

• Bioelectronic devices require advanced materials with both conductivity and biocompatibility.
• Regenerated silk fibroin (RSF) is a promising biocompatible substrate but lacks inherent conductivity.
• Developing methods to impart conductivity to RSF is crucial for its integration into bioelectronic systems.

Purpose of the Study:

• To develop a conductive and biocompatible electrode by in situ polymerization of hydroxymethyl-3,4-ethylenedioxythiophene (EDOT-OH) on a regenerated silk fibroin (RSF) film.
• To optimize the polymerization process using sodium dodecyl sulfate (SDS) as a surfactant and ammonium persulfate as an oxidant.
• To characterize the resulting RSF/PEDOT-OH composite for its electrochemical, morphological, and structural properties.

Main Methods:

• In situ polymerization of EDOT-OH on RSF films.
• Optimization of polymerization parameters including surfactant dosage, oxidant dosage, initial pH, and monomer concentration.
• Characterization using scanning electron microscopy (SEM) for morphology.
• Fourier transform infrared spectroscopy (FTIR) for chemical interactions.
• Electrochemical measurements for conductivity and stability.

Main Results:

• Uniform deposition of poly(hydroxymethyl-3,4-ethylenedioxythiophene) (PEDOT-OH) on RSF films was achieved using SDS.
• Optimal conditions yielded an RSF/PEDOT-OH film with a square resistance of 3.28 × 10^5 Ω (conductance of 6.1 × 10^-3 S/cm).
• FTIR confirmed interactions between RSF peptide linkages and PEDOT-OH, indicating good integration.
• The RSF/PEDOT-OH film demonstrated favorable electrochemical stability, biocompatibility, and fastness.

Conclusions:

• A feasible method was established to create conductive RSF-based biomaterials.
• The RSF/PEDOT-OH composite exhibits excellent conductivity, biocompatibility, and stability.
• This material is highly suitable for potential applications in bioelectric devices, sensors, and tissue engineering.