Electronic hair: Transforming hair into a scalable bioelectronic interface.

Electronic hair (eHAIR) converts human hair into a conformal, low-impedance bioelectronic interface that improves electrophysiological signal amplitude and spectral power without gels or rigid hardware.

• Why it matters: Hair-to-skin contact is a key limitation in electroencephalography, reducing signal quality; eHAIR addresses this by turning naturally distributed hair into an interface.
• What they did: The team used mixed ionic–electronic conductive polymer dyes to functionalize hair via two polythiophene-derivative approaches: rapid washable treatment of hair bundles and semipermanent coating of individual strands.
• The result: eHAIR supports electrophysiological recordings that preserve underlying neural dynamics and enables organic electrochemical transistors for local amplification, with gain set by hair geometry.

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