Dissertation
CONTROLLING ION TRANSPORT PATHWAYS IN POLYMER MIXED ION/ELECTRON CONDUCTING DEVICES
Washington State University
Doctor of Philosophy (PhD), Washington State University
01/2022
DOI:
https://doi.org/10.7273/000004526
Handle:
https://hdl.handle.net/2376/125511
Abstract
Mixed ionic and electronic transport in organic materials is being explored in a wide range of technologies from bioelectronics to energy applications. Their performance critically relies on the interaction of ion channels with conjugated molecules responsible for charge transport. This raises the question whether ion transport can be separated and controlled through film architecture and thus control charge transport as well. Here, differential surface energies between polyelectrolyte components are used to create a nanoscale hydrophilic channel in a mixed conduction thin film device. This channel concentrates ion transport into an ion super-highway with the ion mobility measured to be nearly an order of magnitude higher than previous measurements in similar films. Ion access to this interfacial channel is, furthermore, gated through local surface energy, where gate materials of increasing hydrophobicity drive ions out of the channel, significantly hindering both ion and charge transport. This mechanism is further applied in a novel sensing device where UV-induced chemical changes local to the buried channel actively switches on the ion super highway due to the change in local surface energy. Understanding and controlling this mechanism via device architecture and polymer nanostructure will enable novel functionalities in future electronic, sensing, and medical applications.
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Details
- Title
- CONTROLLING ION TRANSPORT PATHWAYS IN POLYMER MIXED ION/ELECTRON CONDUCTING DEVICES
- Creators
- Tamanna Khan
- Contributors
- Brian Collins (Advisor)Weihong Zhong (Committee Member)Yi Gu (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 140
- Identifiers
- 99900882926901842
- Language
- English
- Resource Type
- Dissertation