Optical and Electrical Properties of Inner Tubes in Outer Wall-Selectively Functionalized Double-Wall Carbon Nanotubes
Optical and Electrical Properties of Inner Tubes in Outer Wall-Selectively Functionalized Double-Wall Carbon Nanotubes
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DOI：
10.1021/jz200687u
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发表时间：
2011-07-07
影响因子：
5.7
通讯作者：
Wang, YuHuang
中科院分区：
文献类型：
--
作者：
Piao, Yanmei;Chen, Chien-Fu;Wang, YuHuang
单壁碳纳米管 (SWNT) 和石墨烯等原子厚材料很容易受到化学攻击，因为所有组成原子都暴露在外。在这里，我们报告了重功能化双壁碳纳米管（DWNT）中内管的光学和电学特性的保留。相关的光学吸收光谱、拉曼散射和薄膜电导率都表明内管的行为与原始单壁碳纳米管惊人地相似；然而，由于外壁的保护，内管可以承受侵蚀性化学侵蚀（例如重氮化学），而不会影响物理性能。在重氮官能化的饱和极限下，SWNT 网络变得电绝缘；形成鲜明对比的是，由于内管通路完好无损，双壁结构保留了大约 50% 的初始电导率。这些结果表明高性能 DWNT 电子器件的可能性，其具有在外壁上定制表面化学的重要功能，而内管则受到化学保护。
Atom-thick materials such as single-wall carbon nanotubes (SWNTs) and graphene are prone to chemical attacks because all constituent atoms are exposed. Here we report the retention of optical and electrical properties of inner tubes in heavily functionalized double-wall carbon nanotubes (DWNTs). Correlated optical absorption spectroscopy, Raman scattering, and thin film electrical conductivity all suggest that an inner tube behaves strikingly similar to a pristine SWNT; however, because of the protection of the outer wall, the inner tube can survive aggressive chemical attacks (e.g., by diazonium chemistry) without compromising physical properties. At the saturation limit of the diazonium functionalization, an SWNT network becomes electrically insulating; in stark contrast, the double-walled structure retains similar to 50% of the initial conductivity, owing to the intact inner tube pathway. These results suggest the possibility of high-performance DWNT electronic devices with important capabilities for tailored surface chemistry on the outer walls, whereas the inner tubes are chemically protected.