Zhu Zhenxing, Wei Nan, Yan Bowen, Shen Boyuan, Gao Jun, Sun Silei, Xie Huanhuan, Xiong Hao, Zhang Chenxi, Zhang Rufan, Qian Weizhong, Fu Song, Peng Lianmao, Wei Fei
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China.
ACS Nano. 2021 Mar 23;15(3):5129-5137. doi: 10.1021/acsnano.0c10300. Epub 2021 Jan 15.
The nature of chaos is in that elusive flow that is an advanced order out of our vision. It is wise to take advantage of chaos after recognizing or modifying its unique fractal properties. Here, a magnetron weaving strategy was developed for producing chaotic but monochromatic carbon nanotube tangles (CNT-Ts) under Kelvin-Helmholtz instability (KHI). The self-similarity characteristic facilitated individual ultralong CNTs to manipulate their entropy-driven fractal geometry, resulting in ∼10 μm CNT-Ts with variable curvature radius. In addition, based on the rate-selected mechanism, 85% metallic and ∼100% semiconducting CNT-Ts were synthesized and separated simultaneously at different length positions. After modifying their fractal into aligned CNTs with hydrogel, these CNT-Ts delivered a current of 10 μA μm in transistors with an on/off ratio >10. It has provided the third route as a paradigm of applying one-dimensional nanomaterials by switching between chaos and fractal, in parallel with that of direct synthesis and postseparation.
混沌的本质在于那种难以捉摸的流动，它是一种超出我们视野的高级秩序。在认识或改变其独特的分形特性之后利用混沌是明智之举。在此，开发了一种磁控管编织策略，用于在开尔文-亥姆霍兹不稳定性（KHI）下制备混沌但单色的碳纳米管缠结（CNT-Ts）。这种自相似特性促使单个超长碳纳米管操控其熵驱动的分形几何结构，从而产生曲率半径可变的约10μm碳纳米管缠结。此外，基于速率选择机制，在不同长度位置同时合成并分离出了85%的金属性和约100%的半导体性碳纳米管缠结。在用凝胶将其分形结构转变为排列整齐的碳纳米管之后，这些碳纳米管缠结在晶体管中实现了10μA/μm的电流，开/关比大于10。它提供了第三条途径，作为通过在混沌和分形之间切换来应用一维纳米材料的范例，与直接合成和后分离并行。
