期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100723
关键词
bioelectronics; electrochemical swelling; MD simulations; organic electrochemical transistors; organic mixed ionic‐ electronic conductors
类别
资金
- KAUST
- Office of Sponsored Research (OSR) [OSR-2018-CRG/CCF-3079, OSR-2019-CRG8-4086, OSR-2018-CRG7-3749]
- ERC Synergy Grant SC2 [610115]
- European Union [952911, 862474]
- EPSRC [EP/T026219/1]
- Knut and Alice Wallenberg Foundation
- Wallenberg Wood Science Center [KAW 2018.0452]
- Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]
- TomKat Center for Sustainable Energy at Stanford University
The electrochemically induced volume changes in organic mixed ionic-electronic conductors (OMIECs) have a significant impact on their performance in electronic devices. This study shows that alterations in the molecular structure of OMIECs affect various processes during their electrochemical swelling, requiring careful balancing of these phenomena to maximize device performance. The findings provide insights into the importance of understanding the molecular processes in OMIECs for their potential applications.
Electrochemically induced volume changes in organic mixed ionic-electronic conductors (OMIECs) are particularly important for their use in dynamic microfiltration systems, biomedical machinery, and electronic devices. Although significant advances have been made to maximize the dimensional changes that can be accomplished by OMIECs, there is currently limited understanding of how changes in their molecular structures impact their underpinning fundamental processes and their performance in electronic devices. Herein, a series of ethylene glycol functionalized conjugated polymers is synthesized, and their electromechanical properties are evaluated through a combined approach of experimental measurements and molecular dynamics simulations. As demonstrated, alterations in the molecular structure of OMIECs impact numerous processes occurring during their electrochemical swelling, with sidechain length shortening decreasing the number of incorporated water molecules, reducing the generated void volumes and promoting the OMIECs to undergo different phase transitions. Ultimately, the impact of these combined molecular processes is assessed in organic electrochemical transistors, revealing that careful balancing of these phenomena is required to maximize device performance.
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