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Enhancement of mechanical properties of vertically aligned carbon nanotube arrays due to N+ ion irradiation

机译：由于N +离子照射，增强垂直对准碳纳米管阵列的力学性能

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In this work we apply N+ ion irradiation on vertically aligned carbon nanotube (VACNT) arrays in order to increase the number of connections and joints in the CNT network. The ions energy was 50 keV and fluence 5 x 10(17) ions cm(-2). The film was 160 mu m thick. SEM images revealed the ion irradiation altered the carbon bonding and created a sponge-like, brittle structure at the surface of the film, with the ion irradiation damage region extending similar to 4 mu m in depth. TEM images showed the brittle structure consists of amorphous carbon forming between nanotubes. The significant enhancement of mechanical properties of the irradiated sample studied by the cyclic nanoindentation with a flat punch indenter was observed. Irradiation on the VACNT film made the structure stiffer, resulted in a higher percentage recovery, and reduced the energy dissipation under compression. The results are encouraging for further studies which will lead to create a class of materials-ion-irradiated VACNT films-which after further research may find application in storage or harvesting energy at the micro/nanoscale.
机译：在这项工作中，我们在垂直对准的碳纳米管（VACNT）阵列上应用n +离子照射，以增加CNT网络中的连接数和接头。离子能量为50keV，流量为5×10（17）离子cm（-2）。这部薄膜厚160亩。 SEM图像揭示了离子照射改变了碳键合，并在薄膜表面产生了海绵状的脆结构，其中离子照射损伤区域延伸得相似于4μm深度。 TEM图像显示脆性结构由纳米管之间的非晶碳组成。观察到通过循环纳米压痕与平压缩进的辐射样品的力学性能的显着提高。 Vacnt薄膜的照射使得结构更硬，导致较高的百分比回收，并降低了压缩下的能量耗散。结果令我们促进进一步研究的进一步研究，这将导致一类材料 - 离子辐照的VACNT薄膜 - 在进一步的研究之后可以在微/纳米级储存或收获能量的应用中。

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