Hyper 100 °C Langmuir-Blodgett (Langmuir-Schaefer) Technique for Organized Ultrathin Film of Polymeric Semiconductors
Hyper 100 °C Langmuir-Blodgett (Langmuir-Schaefer) Technique for Organized Ultrathin Film of Polymeric Semiconductors
复制标题
用于聚合物半导体有序超薄膜的超 100 °C Langmuir-Blodgett (Langmuir-Schaefer) 技术
DOI：
10.1021/acs.langmuir.1c02596
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Ariga Katsuhiko
中科院分区：
文献类型：
--
作者：
Ito Masato;Yamashita Yu;Mori Taizo;Chiba Masaaki;Futae Takayuki;Takeya Jun;Watanabe Shun;Ariga Katsuhiko
在本研究中，我们使用新制造的LB机器将传统的LB方法推进到高温范围（高于100 °C），该LB机器适用于高沸点亚相，作为通用设备。具有高达约200 °C的均匀加热能力的复杂槽设计，连同自动膜压缩和朗缪尔-谢弗型膜转移，使得能够制造具有聚合物主链的单轴对准的聚合物半导体的高度对准薄膜，这对于有效的电荷传输是期望的。在此，在乙二醇上制备半结晶噻吩基半导体的薄膜并加热至80 °C。转移膜的压力-面积等温线，原子力显微镜（AFM），偏光显微镜（POM），和掠入射广角X射线散射（GIWAXS）的分析表明，所提出的高温LB方法允许理想的沉积高品质的分子层精度在选定的高温条件下的薄膜。此外，在高温（高达140 °C）下在离子液体中制备薄膜给体-受体型共聚物是一项具有挑战性的任务，在这项研究中成功地证明了这一点。只有在140 °C下才能得到具有单轴骨架取向的给体-受体聚合物的高度有序薄膜。所获得的具有单轴取向聚合物主链的半结晶薄膜显著有助于分子轨道的二维重叠，这可能促进电荷传输。从各种技术角度来看，使用制造的自动LB机器有利于在较高温度（甚至高于100 °C）下制备更好质量的膜，包括均匀加热、恒定压缩和自动膜转移。本文提出的新方法扩展了Hyper 100 °C Langmuir-Blodgett技术的可能性，该技术无法通过具有水亚相的常规LB方法获得。
In this study, we advanced the conventional Langmuir–Blodgett (LB) method to a high-temperature range (above 100 °C) using a newly manufactured LB machine, which is adaptable to a high-boiling-point subphase, as a universally usable apparatus. A sophisticated trough design, with homogeneous heating capability up to approximately 200 °C, together with automatic film compression and Langmuir–Schaefer type film transfer, enabled the fabrication of highly aligned thin films of polymeric semiconductors with uniaxial alignment of polymer backbones, which is desirable for efficient charge transport. Herein, ultrathin films of semicrystalline thiophene-based semiconductors were prepared on ethylene glycol and heated to 80 °C. The analyses of the transferred films with pressure–area isotherms, atomic force microscopy (AFM), polarized optical microscopy (POM), and grazing-incidence wide-angle X-ray scattering (GIWAXS) indicated that the proposed high-temperature LB method allows ideal deposition of high-quality ultrathin films with molecular layer precision at the selected high-temperature conditions. Furthermore, preparing thin-film donor–acceptor-type copolymers in ionic liquids at high temperatures (up to 140 °C) was a challenging task that was successfully demonstrated in this study. Highly ordered thin films of donor–acceptor polymers with a uniaxial backbone orientation were obtained only at 140 °C. The obtained semicrystalline thin films with uniaxially aligned polymer backbones significantly contribute to the two-dimensional overlap of molecular orbitals, which is likely to promote charge transport. The use of the manufactured automatic LB machines is advantageous for better quality films prepared at higher temperatures (even above 100 °C) from various technical viewpoints, including homogeneous heating, constant compression, and automatic film transfer. The novel methodology proposed herein expands the possibilities of the Hyper 100 °C Langmuir–Blodgett technique, which has not been accessible by the conventional LB method with the aqueous subphase.