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首页> 外文期刊>Physical review >Ultraviolet photon absorption in single- and double-wall carbon nanotubes and peapods: Heating-induced phonon line broadening, wall coupling, and transformation
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Ultraviolet photon absorption in single- and double-wall carbon nanotubes and peapods: Heating-induced phonon line broadening, wall coupling, and transformation

机译：单壁和双壁碳纳米管和豆荚中的紫外光子吸收：加热引起的声子线展宽，壁耦合和转变

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摘要

Ultraviolet photon absorption has been used to heat single- and double-wall carbon nanotubes and peapods in vacuum. By increasing the laser intensity up to 500 mW, a downshift and a broadening of the optical phonons are observed corresponding to a temperature of 1000℃. The UV Raman measurements are free of blackbody radiation. We find that the linewidth changes for the G_+ and G_- bands differ considerably in single-wall carbon nanotubes. This gives evidence that the phonon decay process is different in axial and radial tube directions. We observe the same intrinsic linewidths of graphite (highly oriented pyrolytic graphite) for the G band in single- and double-wall carbon nanotubes. With increasing temperature, the interaction between the walls is modified for double-wall carbon nanotubes. Ultraviolet photon induced transformations of peapods are found to be different on silica and diamond substrates.
机译：紫外线光子吸收已用于在真空中加热单壁和双壁碳纳米管和豆荚。通过将激光强度提高到500 mW，可以观察到对应于1000℃的温度，光子的下降和变宽。紫外拉曼测量没有黑体辐射。我们发现，在单壁碳纳米管中，G_ +和G_-带的线宽变化差异很大。这提供了声子衰减过程在轴向和径向管方向上不同的证据。我们观察到单壁和双壁碳纳米管中G带的石墨（高取向热解石墨）固有线宽相同。随着温度的升高，双壁碳纳米管的壁间相互作用得到了改善。发现紫外光子引起的豌豆足的转化在二氧化硅和金刚石基质上是不同的。

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