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Morphology-Controlled Ionic-Electronic Coupling in PEDOT:PSS Enabled by Substituent Engineering of A-Type Grids
Yang Li1, Haodi Zhu1, Zheng Zhang1
1Centre for Molecular Systems and Organic Devices (CMSOD), State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, China.
Molecular additives precisely control nanostructure in poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) for enhanced ionic-electronic coupling. This improves performance in flexible actuators for soft robotics.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Chemistry
Background:
- Organic mixed ionic-electronic conductors like PEDOT:PSS are crucial for iontronics.
- Efficient ionic-electronic coupling is hindered by inhomogeneous phase distribution in PEDOT:PSS.
- Tailoring PEDOT:PSS nanostructure is key to improving device performance.
Purpose of the Study:
- To investigate the effect of A-type nanogrids (AGs) as molecular additives on PEDOT:PSS nanostructure.
- To enhance ionic-electronic coupling and performance in PEDOT:PSS-based devices.
- To develop advanced flexible actuators for soft robotics.
Main Methods:
- Systematic modification of PEDOT:PSS nanostructure using A-type nanogrids (AGs) with different substituents (AG-H, AG-PhOC8, AG-Ph).
- Analysis of PEDOT:PSS phase distribution and PEDOT/PSS contact.
- Evaluation of electrochemical actuation performance of modified PEDOT:PSS electrodes.
Main Results:
- AG-H and AG-PhOC8 promoted uniform phase distribution, enhancing ionic-electronic coupling.
- AG-Ph exacerbated phase separation, degrading performance.
- Modified PEDOT:PSS electrodes achieved displacements >20 mm and bending angles of ~100° at 1.0 Hz and 3.0 V.
Conclusions:
- Molecular additives can effectively tailor PEDOT:PSS phase structure at a molecular level.
- Optimized PEDOT:PSS nanostructure leads to significantly improved electrochemical actuation performance.
- This strategy enables the development of high-performance flexible actuators for soft robotics.
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