High Pressure Vibrational Properties of WS2 Nanotubes

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• 作者：K. R. O’Neal ; J. G. Cherian ; A. Zak ; R. Tenne ; Z. Liu ; J. L. Musfeldt
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：16
• 期：2
• 页码：993-999
• 全文大小：480K
• ISSN：1530-6992

文摘

We bring together synchrotron-based infrared and Raman spectroscopies, diamond anvil cell techniques, and an analysis of frequency shifts and lattice dynamics to unveil the vibrational properties of multiwall WS₂ nanotubes under compression. While most of the vibrational modes display similar hardening trends, the Raman-active A_1g breathing mode is almost twice as responsive, suggesting that the nanotube breakdown pathway under strain proceeds through this displacement. At the same time, the previously unexplored high pressure infrared response provides unexpected insight into the electronic properties of the multiwall WS₂ tubes. The development of the localized absorption is fit to a percolation model, indicating that the nanotubes display a modest macroscopic conductivity due to hopping from tube to tube.