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CPOS Seminar: "Self-doping efficiency and stability of conjugated polyelectrolytes in aqueous solutions"

Date and Time
Location
In-person: CPOS Conference Room - PSBN 2520D
TUNG NGUYEN-DANG, PhD, Center for Polymers and Organic Solids, UCSB
TUNG NGUYEN-DANG, PhD, Center for Polymers and Organic Solids, UCSB

Speaker: TUNG NGUYEN-DANG, PhD, Center for Polymers and Organic Solids , University of California Santa Barbara

Short bio: Dr. Tung Nguyen-Dang is a postdoc scholar working at CPOS under the supervision of Prof. Thuc-Quyen Nguyen. His research focuses on electrochemical devices using conjugated polymers and polyelectrolytes for applications in electronics and biosensing. Dr. Nguyen-Dang’s work has been supported by an NSF grant, Otis Williams Postdoc Fellowship, and Swiss Foundation Postdoc Fellowship. Before joining CPOS, he obtained an Engineering Diploma from Ecole Polytechnique (France) and a PhD in Materials Science from EPFL (Switzerland), and worked as a research engineer at Saint Gobain (France). Dr. Nguyen-Dang will join the School of Engineering and Computer Science at VinUniversity (Vietnam) as an assistant professor in the summer 2023.

 Abstract: Self-doped conjugated polyelectrolytes have been shown as a new class of active materials in organic electrochemical transistors.[1] Besides being excellent mixed ionic-electronic conductors with good electronic conductivity and high volumetric capacitance, these polyelectrolytes possess several unique properties working in aqueous solutions: dual ionic transport and structural stability. These properties represent unexploited opportunities for applications in electronics, optoelectronics, and biomedical engineering. For instance, recently we demonstrated the first dual-mode organic transistors and their applications of reconfigurable electronics.[2] In this talk, I will present the recent results of our investigation on these behaviors of PCPDTBT-SO3-K (a.k.a. CPE-K), a mode material for self-doped conjugated polyelectrolyte study. Using time-resolved spectroelectrochemistry, self-doping efficiency of CPE-K is estimated to be about 8.51% in KCl 100mM, therefore, CPE-K can be both doped by anionic injection to a fully doped state and dedoped by cationic injection to a fully dedoped state. At the same time, co-existing hydrophobic and hydrophilic domains in CPE-K, evidenced by X-ray diffraction and simulation, would be responsible for the good structural stability of CPE-K operating in aqueous electrolytes. Beyond their use in electrochemical devices, these results would pave the way for the design of next generation high-performance mixed ionic-electronic conductors for real life applications. 

Reference:

[1] Lill, A. T.; Cao, D. X.; Schrock, M.; Vollbrecht, J.; Huang, J.; Nguyen-Dang, T.; Brus, V. V.; Yurash, B.; Leifert, D.; Bazan, G. C.; Nguyen, T. Q. Adv. Mater. 2020, 32 (33), 1908120. https://doi.org/10.1002/adma.201908120.

[2] Nguyen-Dang, T.; Chae, S.; Chatsirisupachai, J.; Wakidi, H.; Promarak, V.; Visell, Y.; Nguyen, T. Q. Adv. Mater. 2022, 23 (34), 2200274.