Determination of the Thermal Expansion Coefficient of Single-Wall Carbon Nanotubes by Raman Spectroscopy |
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Authors: | L I Espinosa-Vega H Navarro-Contreras M A Vidal |
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Institution: | Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACYT) Universidad Autónoma de San Luis Potosí , San Luis Potosí , México |
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Abstract: | We have examined the effect of high temperature on single-wall carbon nanotubes under air and nitrogen ambient by Raman spectroscopy. We observe the temperature dependence of the radial breathing mode and the G-band modes. The thermal expansion coefficient (β) of the bundled nanotubes is obtained experimentally using the estimated volume from Raman scattering. β behaves linearly with temperature from 0.33 × 10?5 K?1 to 0.28 × 10?5 K?1 in air and from 0.58 × 10?5 K?1 to 0.47 × 10?5 K?1 in nitrogen ambient, respectively. The temperature dependence of the radial breathing mode Raman frequencies is consistent with a pure temperature effect. |
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Keywords: | nanotubes Raman spectroscopy thermal expansion |
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