Rate-selected growth of ultrapure semiconducting carbon nanotube arrays

Zhenxing Zhu, Nan Wei, Weijun Cheng, Boyuan Shen, Silei Sun, Jun Gao, Qian Wen, Rufan Zhang, Jun Xu, Yao Wang and Fei Wei ()
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Zhenxing Zhu: Tsinghua University
Nan Wei: Aalto University
Weijun Cheng: Tsinghua University
Boyuan Shen: Tsinghua University
Silei Sun: Tsinghua University
Jun Gao: Tsinghua University
Qian Wen: Tsinghua University
Rufan Zhang: Tsinghua University
Jun Xu: Tsinghua University
Yao Wang: Tsinghua University
Fei Wei: Tsinghua University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Carbon nanotubes (CNTs) are promising candidates for smart electronic devices. However, it is challenging to mediate their bandgap or chirality from a vapor-liquid-solid growth process. Here, we demonstrate rate-selected semiconducting CNT arrays based on interlocking between the atomic assembly rate and bandgap of CNTs. Rate analysis confirms the Schulz-Flory distribution which leads to various decay rates as length increases in metallic and semiconducting CNTs. Quantitatively, a nearly ten-fold faster decay rate of metallic CNTs leads to a spontaneous purification of the predicted 99.9999% semiconducting CNTs at a length of 154 mm, and the longest CNT can be 650 mm through an optimized reactor. Transistors fabricated on them deliver a high current of 14 μA μm−1 with on/off ratio around 108 and mobility over 4000 cm2 V−1 s−1. Our rate-selected strategy offers more freedom to control the CNT purity in-situ and offers a robust methodology to synthesize perfectly assembled nanotubes over a long scale.

Date: 2019
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DOI: 10.1038/s41467-019-12519-5

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