Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.; Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China.
Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China.
Sci Adv. 2016 Nov 30;2(11):e1601572. doi: 10.1126/sciadv.1601572. eCollection 2016 Nov.
Great effort has been applied to scientific research on the controllable synthesis of carbon nanotubes (CNTs) with high semiconducting selectivity or high areal density toward the macroscale applications of high-performance carbon-based electronics. However, the key issue of compatibility between these two requirements for CNTs remains a challenge, blocking the expected performance boost of CNT devices. We report an in situ acoustic-assisted assembly of high-density monochromatic CNT tangles (m-CNT-Ts), consisting of one self-entangled CNT with a length of up to 100 mm and consistent chirality. On the basis of a minimum consumed energy model with a Strouhal number of approximately 0.3, the scale could be controlled within the range of 1 × 10 to 3 × 10 μm or even a larger range. Transistors fabricated with one m-CNT-T showed an on/off ratio of 10 to 10 with 4-mA on-state current, which is also the highest on-state current recorded so far for single CNT-based transistors. This acoustic-assisted assembly of chiral-consistent m-CNT-Ts will provide new opportunities for the fabrication of high-performance electronics based on perfect CNTs with high purity and high density.
人们在碳纳米管（CNT）的可控合成方面投入了大量精力，以期获得高半导体选择性或高面密度的 CNT，从而实现高性能碳基电子器件的大规模应用。然而，CNT 满足这两个要求的关键问题仍然具有挑战性，这阻碍了 CNT 器件预期性能的提升。我们报告了一种高密度单色谱 CNT 缠结（m-CNT-Ts）的原位声辅助组装方法，这些缠结由一根长达 100mm 且具有一致手性的自缠 CNT 组成。基于具有约 0.3 的斯特劳哈尔数的最小能耗模型，组装的 CNT 缠结的尺寸可以控制在 1×10 到 3×10μm 范围内，甚至可以更大。用一根 m-CNT-T 制造的晶体管具有 10 到 10 的导通/关断比和 4mA 的导通电流，这也是迄今为止记录到的单根 CNT 晶体管的最高导通电流。这种手性一致的 m-CNT-T 的声辅助组装将为基于高纯度和高密度 CNT 的高性能电子器件的制造提供新的机会。
