Flexible conducting polymer-based cellulose substrates for on-skin applications

Area of Science:

• Materials Science
• Biomedical Engineering
• Electrochemistry

Background:

• Developing advanced materials for biomedical applications is crucial.
• Cellulose-based substrates offer flexibility and biocompatibility.
• Conductive polymers enhance electronic and cellular interaction properties.

Purpose of the Study:

• To fabricate flexible electroactive cellulose-based substrates using electropolymerization.
• To investigate the properties and potential applications of polypyrrole (PPy) and poly(3,4-ethylenedioxythiophene) (PEDOT) on cellulose.
• To evaluate the cytocompatibility and ion-doping capabilities of these novel materials.

Main Methods:

• Electropolymerization of PPy and PEDOT onto platinum-coated cellulose substrates in the presence of sodium dodecyl sulphate (SDS).
• Characterization of surface topography, mechanical properties, and structural integrity.
• Assessment of cell adhesion and proliferation using immortalized human keratinocytes (HaCaT cells).
• Doping of copper (Cu2+) and zinc (Zn2+) ions and analysis of ion release.

Main Results:

• Uniform deposition of conductive polymers (PPy, PEDOT) on cellulose substrates, forming nanoroughness.
• Good mechanical properties and cytocompatibility, supporting HaCaT cell attachment and proliferation.
• Successful doping of Cu2+ and Zn2+ ions, with higher doping efficiency in PEDOT-cellulose substrates.
• PEDOT-cellulose substrates demonstrated superior mechanical properties, cell attachment, and electrochemical capacitance compared to PPy-cellulose.

Conclusions:

• Fabricated electroactive cellulose-based papers exhibit promising properties for biomedical applications.
• PEDOT-cellulose substrates show enhanced performance, making them suitable for smart skin dressings.
• These materials hold potential as integration interfaces for artificial devices and implantable electronics.