Qian Liu, Xie Ying, Yu Yue, Wang Shanshan, Zhang Shuchen, Zhang Jin
Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Angew Chem Int Ed Engl. 2020 Jun 26;59(27):10884-10887. doi: 10.1002/anie.202002651. Epub 2020 Apr 8.
Single-walled carbon nanotube (SWNT) horizontal arrays with specific chirality can be enriched using solid carbide catalysts on substrates. However, scale-up production by continuous loading of the solid catalysts onto the substrates is challenging. Described here is the preparation of a floating carbide solid catalyst (FSC) for the controlled growth of SWNTs. The FSC, titanium carbide (TiC) nanoparticle, was directly obtained in the carrier gas phase by decomposition and carbonization of the titanocene dichloride precursor at high temperature. By using the TiC nanoparticle FSC, both SWNT horizontal arrays and randomly distributed networks can be obtained. The chirality of the as-grown SWNTs were thermodynamically controlled to have fourfold symmetry. Further optimization of growth condition resulted in an abundance of (16,8) tubes with about a 74 % content. This FSC chemical vapor deposition (FSCCVD) method has potential for realizing mass growth of SWNTs with controlled structures.
具有特定手性的单壁碳纳米管（SWNT）水平阵列可以通过在基底上使用固体碳化物催化剂来富集。然而，通过将固体催化剂连续负载到基底上进行放大生产具有挑战性。本文描述了一种用于可控生长SWNTs的浮动碳化物固体催化剂（FSC）的制备。FSC，即碳化钛（TiC）纳米颗粒，是通过二氯二茂钛前驱体在高温下分解和碳化在载气相中直接获得的。通过使用TiC纳米颗粒FSC，可以获得SWNT水平阵列和随机分布的网络。生长的SWNTs的手性在热力学上被控制为具有四重对称性。生长条件的进一步优化导致大量（16,8）管，含量约为74%。这种FSC化学气相沉积（FSCCVD）方法具有实现具有可控结构的SWNTs大规模生长的潜力。
