What question did this study set out to answer?

This research aims to explore the actuation behavior and charging mechanisms of thin PEDOT:PSS films.

March 12, 2026Open Access

Actuation and Charging Mechanisms of Thin PEDOT:PSS Films Probed by Electrochemical AFM and Impedance Spectroscopy

Key Points

This research aims to explore the actuation behavior and charging mechanisms of thin PEDOT:PSS films.
Used atomic force microscopy to analyze actuation behavior of films with thickness from 100 nm to 3 μm.
Employed electrochemical impedance spectroscopy to examine film charging characteristics.
Compared the properties of oxidized and reduced films.
Thicker films exhibited decreased relative expansion during actuation.
Volume charge density was found to decline with increasing film thickness.
Pseudo-capacitance related to ion diffusion also decreased for thicker films.

Abstract

PEDOT:PSS is a widely applied material in the field of organic electronics. Due to its mixed ionic-electronic conductivity, it is popular for soft actuators based on stimulated ion exchange. However, for confined spaces like thin films, interfaces play an important role in the actuation. Hence, we studied the actuation behavior of thin films of PEDOT:PSS with film thicknesses ranging from 100 nm up to 3 μm by atomic force microscopy. We observed a decrease in the relative expansion for thicker films. Moreover, the volume charge density also decreased. Electrochemical impedance spectroscopy granted more insight into film charging. We observed significant differences between oxidized and reduced films. We described ion diffusion by a pseudo-capacitance, which also decreased for thicker films. Hence, we conclude a limitation in thin PEDOT:PSS films affects the charging and the actuation.

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