Air-Liquid Interfacial Self-Assembly of Non-Amphiphilic Poly(3-hexylthiophene) Homopolymers.
Here, we demonstrate that the self-assembly of poly(3-hexylthiophene) (P3HT) at the air-water interface can lead to free-standing films of densely packed P3HT nanowires. Interfacial self-assembly on various liquid subphases, such as water, diethylene glycol, and glycerol, indicates that the viscosity of the subphase is an important factor for the formation of well-ordered nanostructures. The thin-film morphology is also sensitive to the concentration of P3HT, its molecular weight (MW), and the presence of oxidative defects. The densely packed nanowire films can be easily transferred to solid substrates for device applications. The ultrathin films of P3HT prepared by the interfacial assembly showed significantly higher hole mobility (∼3.6 × 10-2cm2/V s) in a field-effect transistor than comparably thin spin-cast films. This work demonstrates that the air-liquid interfacial assembly is not limited to amphiphilic polymers and can, under optimized conditions, be applied to fabricate ultrathin films of widely used conjugated polymers with controlled morphologies.
Department of Chemistry and Nano Science, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea.
Saejin
S
Oh
Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University , Seoul 151-747, Korea.
Myungjae
M
Yang
Department of Chemistry and Nano Science, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea.
Jean
http://orcid.org/0000-0003-2281-2088
J
Bouffard
Department of Physics and Astronomy and Institute of Applied Physics, Seoul National University , Seoul 151-747, Korea.
Seunghun
S
Hong
Department of Chemistry and Nano Science, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Korea.
So-Jung
http://orcid.org/0000-0002-6364-3754
SJ
Park
Conjugated polymer; air−liquid interface; field-effect transistor; nanowire; self-assembly