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Controllable synthesis of spongy carbon nanotube blocks with tunable macro- and microstructures

机译:具有可调整的宏观和微观结构的海绵状碳纳米管嵌段的可控合成

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摘要

Macroscopic carbon nanotubes (CNTs) with uniform structures are in great demand for use in composites and environmental materials. Here we demonstrate the controlled synthesis of spongy CNT blocks with isotropic properties and flexible, freestanding structures. The formation mechanism of the isotropic CNT sponges is discussed, based on its open-ended structure and initial formation in the vapor phase. The microstructure of the CNT sponges can be tuned by changing the flow rate of the carrier gas, resulting in CNT sponges with diameters ranging from 30.2 to 47.8 nm and wall thicknesses from 7 to 16 nm. The bulk density (5-25 mg cm~(-3)), mechanical strength of the CNT sponges, and filling rate of ferromagnetic catalyst in the CNT sponges can also be modulated by controlling the supply rate of the carbon source, suggesting potential applications in mechanical energy absorption and environmental materials.
机译:具有均匀结构的宏观碳纳米管(CNT)非常需要用于复合材料和环境材料中。在这里,我们展示了具有各向同性特性和灵活,独立结构的海绵状CNT嵌段的受控合成。基于各向同性CNT海绵的开端结构和在气相中的初始形成,讨论了各向同性CNT海绵的形成机理。可以通过改变载气的流速来调整CNT海绵的微观结构,从而得到直径为30.2至47.8 nm,壁厚为7至16 nm的CNT海绵。碳纳米管的体积密度(5-25 mg cm〜(-3)),碳纳米管海绵的机械强度以及铁磁催化剂在碳纳米管海绵中的填充速率也可以通过控制碳源的供给速率来调节,这表明了潜在的应用前景在机械能吸收和环境材料方面。

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