Growth and Mechanics of Heterogeneous, 3D Carbon Nanotube Forest Microstructures Formed by Sequential Selective-Area Synthesis
Growth and Mechanics of Heterogeneous, 3D Carbon Nanotube Forest Microstructures Formed by Sequential Selective-Area Synthesis
复制标题
顺序选择性区域合成形成的异质 3D 碳纳米管森林微结构的生长和力学
DOI：
10.1021/acsami.0c03082
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发表时间：
2020
影响因子：
9.5
通讯作者：
Maschmann, Matthew R.
中科院分区：
文献类型：
--
作者：
Hines, Ryan;Hajilounezhad, Taher;Love-Baker, Cole;Koerner, Gordon;Maschmann, Matthew R.
三维碳纳米管（CNT）森林微观结构的合成使用测序，位点特异性合成技术。Al2O3薄膜层和Al2O3/Fe薄膜层在特定区域支持薄膜催化剂和漂浮催化剂化学气相沉积（CVD）。Al2O3区域只支持漂浮催化剂CVD，而层状Al2O3/Fe区域同时支持薄膜和漂浮催化剂碳纳米管生长。两种CVD方法的序列应用产生了非均匀的3D碳纳米管森林微结构，包括仅薄膜催化剂碳纳米管区域，仅漂浮催化剂碳纳米管区域以及垂直堆叠层。非均质碳纳米管森林的压缩力学行为进行了评估，堆叠层表现出两个不同的屈曲高原。对层叠层的有限元模拟表明，相对柔软的薄膜-催化剂碳纳米管林在底层浮动催化剂碳纳米管林发生大规模变形之前几乎完全屈曲。
Three-dimensional carbon nanotube (CNT) forest microstructures are synthesized using sequenced, site-specific synthesis techniques. Thin-film layers of Al2O3and Al2O3/Fe are patterned to support film-catalyst and floating-catalyst chemical vapor deposition (CVD) in specific areas. Al2O3regions support only floating-catalyst CVD, whereas regions of layered Al2O3/Fe support both film- and floating-catalyst CNT growth. Sequenced application of the two CVD methods produced heterogeneous 3D CNT forest microstructures, including regions of only film-catalyst CNTs, only floating-catalyst CNTs, and vertically stacked layers of each. The compressive mechanical behavior of the heterogeneous CNT forests was evaluated, with the stacked layers exhibiting two distinct buckling plateaus. Finite element simulation of the stacked layers demonstrated that the relatively soft film-catalyst CNT forests were nearly fully buckled prior to large-scale deformation of the bottom floating-catalyst CNT forests.