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Mechanically Robust Free-Standing Single-Walled Carbon Nanotube Thin Films With Uniform Mesh-Structure by Blade Coating
Frontiers in Materials ( IF 3.2 ) Pub Date : 2020-08-14 , DOI: 10.3389/fmats.2020.562455
Yuichi Kato , Atsuko Sekiguchi , Kazufumi Kobashi , Rajyashree Sundaram , Takeo Yamada , Kenji Hata

Carbon nanotubes (CNTs) have garnered tremendous attention as building blocks for self-supporting membranes owing to remarkable developments in the manufacturing technology of high-quality CNT films. CNT films are expected to be applied in a wide range of applications, such as ultrafiltration membranes and as switching or sensing elements in microelectromechanical systems. However, the main challenge has been in fabricating CNT films by versatile and scalable processes suitable for industrial production while retaining lab-scale high performance. In this work, we succeed in fabricating macroscale (10 cm2) free-standing CNT films with thicknesses as low as 200 nm showing tensile strengths of ∼166 MPa by simple, versatile, and scalable blade-coating of CNT suspensions. Our study demonstrates that it is possible to control CNT film bundle size distribution and pore structure by controlling the CNT dispersibility and entanglement in the suspensions. We find that controlling bundle size distribution, pore structure uniformity, and packing can lead to five-fold, four-fold, and three-fold higher tensile strengths, fracture strain, and Young’s modulus, respectively, compared to films with poorer uniformity and packing.



中文翻译:

机械稳定的单壁碳纳米管单壁碳纳米管薄膜的叶片涂层

由于高质量CNT膜的制造技术的显着发展,碳纳米管(CNTs)作为自支撑膜的构件而受到了极大的关注。CNT膜有望被广泛应用,例如超滤膜以及微机电系统中的开关或传感元件。然而,主要挑战在于通过适用于工业生产的通用且可扩展的工艺制造CNT膜,同时保持实验室规模的高性能。在这项工作中,我们成功地制造了宏观尺度(10 cm 2)厚度低至200 nm的自立式CNT膜通过简单,通用且可扩展的CNT悬浮液刮涂技术显示出约166 MPa的拉伸强度。我们的研究表明,可以通过控制CNT在悬浮液中的分散性和缠结来控制CNT膜束的尺寸分布和孔结构。我们发现,与均匀性和填充性较差的薄膜相比,控制束大小分布,孔结构均匀性和填充可分别导致拉伸强度,断裂应变和杨氏模量分别提高五倍,四倍和三倍。 。

更新日期:2020-10-08
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