期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 6, 页码 8266-8273出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c22535
关键词
self-assembly; magnetic nanoparticles; conjugated block copolymers; magnetic field; nanoarray; interface
资金
- National Research Foundation (NRF) of Korea [NRF2018R1A2B3001049]
- Korea Basic Science Institute (National Research Facilities and Equipment Center) grant - Ministry of Education [2020R 1A 6C 101B194]
- Science Research Center - Korea government (MIST) [NRF-2017R1A5A1015365]
This study reports the magnetic field-induced self-assembly of a conjugated block copolymer and iron oxide nanoparticles at the air-water interface. The magnetic field significantly improves the degree of order, resulting in long-range ordered nanoarrays of the polymer and nanoparticles. The size of the nanoparticles plays a crucial role in the formation of an ordered assembly structure at the nanometer scale.
Here, we report the magnetic field-induced self-assembly of a conjugated block copolymer, poly(3-hexylthiopene)-block-poly(ethylene glycol) (P3HT-b-PEG), and iron oxide nanoparticles (IONPs) at the air-water interface. Binary self-assembly of P3HT-b-PEG and IONPs at the interface results in nanoparticle-embedded P3HT- b-PEG nanowire arrays with a micrometer-scale domain size. Under the magnetic field, the field-induced magnetic interaction significantly improves the degree of order, generating long-range ordered, direction-controlled nanoarrays of P3HT-b-PEG and IONPs, where IONPs are aligned in the direction of the magnetic field over a sub-millimeter scale. The size of IONPs is an important factor for the formation of an ordered assembly structure at the nanometer scale, as it dictates the magnetic dipole interaction and the entropic interaction between nanoparticles and polymers. The consideration of magnetic dipole interactions suggests that the field-induced self-assembly occurs through the formation of intermediate magnetic subunits composed of short IONP strings along the semirigid P3HT nanowires, which can be aligned through the magnetic interactions, ultimately driving the long-range ordered self-assembly. This study demonstrates for the first time that the magnetic field-induced self-assembly can be used to generate macroscopically ordered polymer films with a nanometer-scale order in low fields.
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