Stabilization of carbon nanotubes by filling with inner tubes: An optical spectroscopy study on double-walled carbon nanotubes under hydrostatic pressure
Stabilization of carbon nanotubes by filling with inner tubes: An optical spectroscopy study on double-walled carbon nanotubes under hydrostatic pressure
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DOI：
10.1103/physrevb.86.155454
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发表时间：
2012-10
影响因子：
3.7
通讯作者：
B. Anis;K. Haubner;F. Börrnert;L. Dunsch;M. Rümmeli;C. Kuntscher
中科院分区：
文献类型：
--
作者：
B. Anis;K. Haubner;F. Börrnert;L. Dunsch;M. Rümmeli;C. Kuntscher
通过对双壁碳纳米管束在静水压力下的光学跃迁的光谱分析，证明了通过填充内管实现碳纳米管的稳定化。以富勒烯豆荚为原料制备了双壁碳纳米管薄膜，并用高分辨电子显微镜和光谱分析对其进行了表征。与单壁碳纳米管相比，外管中光学跃迁的压力引起的红移在10 Gpa以下要小得多，这表明由于内管已经处于低压力下，机械稳定性得到了提高。在临界压力下出现的异常，意味着12 Gpa的压力引起的管子横截面开始变形。P值与平均直径相近的双壁碳纳米管束中压力诱导结构转变的理论预测符合得很好。
The stabilization of carbon nanotubes via the filling with inner tubes is demonstrated by probing the optical transitions in double-walled carbon nanotube bundles under hydrostatic pressure with optical spectroscopy. Double-walled carbon nanotube films were prepared from fullerene peapods and characterized by high-resolution transmission electron microscopy and optical spectroscopy. In comparison to single-walled carbon nanotubes, the pressure-induced redshifts of the optical transitions in the outer tubes are significantly smaller below $\ensuremath{\sim}$10 GPa, demonstrating the enhanced mechanical stability due to the inner tube already at low pressures. Anomalies at the critical pressure $P$${}_{d}\ensuremath{\approx}12$ GPa signal the onset of the pressure-induced deformation of the tubular cross sections. The value of $P$${}_{d}$ is in very good agreement with theoretical predictions of the pressure-induced structural transitions in double-walled carbon nanotube bundles with similar average diameters.