van der Waals SWCNT@BN Heterostructures Synthesized from Solution-Processed Chirality-Pure Single-Wall Carbon Nanotubes
van der Waals SWCNT@BN Heterostructures Synthesized from Solution-Processed Chirality-Pure Single-Wall Carbon Nanotubes
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由溶液处理的手性纯单壁碳纳米管合成的范德华SWCNT@BN异质结构
DOI：
10.1021/acsnano.2c07128
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发表时间：
2022
期刊：
影响因子：
17.1
通讯作者：
Wang, YuHuang
中科院分区：
文献类型：
--
作者：
Zhang, Chiyu;Fortner, Jacob;Wang, Peng;Fagan, Jeffrey A.;Wang, Shuhui;Liu, Ming;Maruyama, Shigeo;Wang, YuHuang
氮化硼中的单壁碳纳米管（SWCNT@BN）是一维的货车德瓦尔斯异质结构，表现出有趣的物理和化学性质。与它们的碳纳米管对应物一样，这些异质结构可以由手性的不同组合形成，提供丰富的结构，但也对控制它们的结构提出了重大的合成挑战。通过在纳米管手性排序，清洁去除用于溶液处理的表面活性剂的进展，和一个简单的方法来制造独立的亚单层膜的手性纯单壁碳纳米管作为模板的BN生长，我们表明，它是可能的直接生长BN手性富集单壁碳纳米管从溶液处理形成货车德瓦尔斯异质结构。我们进一步报告影响异质结构形成的因素，包括在H2的存在下的加速生长速率，和显着改善的生长BN的结晶，BN厚度控制到一个单一的BN层，通过在反应器中的Cu箔的存在下。透射电子显微镜和电子能量损失光谱图证实了从溶液纯化的纳米管合成SWCNT@BN。发现（7，5）-和（8，4）-SWCNT@BN异质结构的光致发光峰相对于裸SWCNT红移（约10 nm）。拉曼散射表明，生长的BN壳对单壁碳纳米管芯造成限制效应。
Single-wall carbon nanotubes in boron nitride (SWCNT@BN) are one-dimensional van der Waals heterostructures that exhibit intriguing physical and chemical properties. As with their carbon nanotube counterparts, these heterostructures can form from different combinations of chiralities, providing rich structures but also posing a significant synthetic challenge to controlling their structure. Enabled by advances in nanotube chirality sorting, clean removal of the surfactant used for solution processing, and a simple method to fabricate free-standing submonolayer films of chirality pure SWCNTs as templates for the BN growth, we show it is possible to directly grow BN on chirality enriched SWCNTs from solution processing to form van der Waals heterostructures. We further report factors affecting the heterostructure formation, including an accelerated growth rate in the presence of H2, and significantly improved crystallization of the grown BN, with the BN thickness controlled down to one single BN layer, through the presence of a Cu foil in the reactor. Transmission electron microscopy and electron energy-loss spectroscopic mapping confirm the synthesis of SWCNT@BN from the solution purified nanotubes. The photoluminescence peaks of both (7,5)- and (8,4)-SWCNT@BN heterostructures are found to redshift (by ∼10 nm) relative to the bare SWCNTs. Raman scattering suggests that the grown BN shells pose a confinement effect on the SWCNT core.