ORGS1-0624
Charge-Transfer-Induced Crystallization Nanoassemly of Conjugated Polymer Elucidated by Cryogenic TEM
Topic
GS1. Graduate Student Oral Session I: Colloidal and Interfacial Polymer Science
When and Where
Sep 28, 2026
16:24 - 16:36
Room 101
Session Chairs
Yoon-Ho HWANG
Jang-Hwan KIM
Hyosung AN
Presenter(s)
JunYeon Yoon (Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju, Korea (the Republic of))
Co-Author(s)
Abstract
Molecular doping tunes the electronic and morphological properties of conjugated polymers, yet how donor-acceptor interaction shapes the resulting nanostructure remains unclear. Here, a polythiophene-based conjugated polymer and a strong, high-electron-affinity fluorinated acceptor co-assemble in solution into one-dimensional co-crystalline nanowires. Cryo-TEM resolves the lamellar lattices within single nanowires and reveals an inter-lamellar spacing expanded relative to the undoped polymer, indicating intercalation of the acceptor between the alkyl side chains. A redshift of the C≡N stretch (FT-IR), polaron and anion absorptions (UV-vis), and unpaired-spin growth (EPR) establish integer charge transfer; a structurally analogous acceptor with a shallower LUMO reproduces none of these, showing that an electron-affinity threshold triggers assembly. The acceptor thus occupies the alkyl region between lamellae, providing both the driving force and template for one-dimensional growth
