Switching the solubility of n-type mixed conductors for degradable transistors
Laure Kayser a
a University of Delaware, 127 The Green, RM 201, Newark, United States
Proceedings of MATSUS Spring 2026 Conference (MATSUSSpring26)
I2 Organic materials and devices for sustainable and transient electronics
Barcelona, Spain, 2026 March 23rd - 27th
Organizers: Noemí Contreras-Pereda and Micaela Matta
Invited Speaker, Laure Kayser, presentation 295
Publication date: 15th December 2025

NDI polymers with hydrophilic glycolated side chains are promising materials for n-type mixed ionic-electronic conduction. They have been successfully incorporated in organic electrochemical transistors (OECTs) for biosensing. These materials show high performance and stability in OECTs operating in aqueous environments when a small percentage of alkylated side chains are present in the copolymer. Our goal was to create materials with similar performance that can later be degraded to facilitate the recycling of the metal electrodes. In this presentation, I will share our work on the synthesis and characterization of naphtalene diimide (NDI) copolymers bearing glycolated and carboxylic acid-protected side chains. We used varying ratio of masked carboxylic acid and glycolated side chains to optimize the performance of the materials. Next, we used a deprotection procedure to remove the alkyl side chains, revealing the carboxylic acid. We found that even a low loading of carboxylic acid, the polymer became water soluble. This solubilization process could enable the removal of the mixed conductor to achieve partially transient electronics.

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