Effect of bundling on the π plasmon energy in sub-nanometer single wall carbon nanotubes
2011
Lingam, K. | Podila, R. | Loebick, C. | Chen, P. | Ke, P.-C. | Powell, B. | Pfefferle, L. | Rao, A.M.
Due to their unusual electronic and vibrational properties, single walled carbon nanotubes (SWCNTs) with sub-nanometer diameters d∼0.5–0.9nm have recently gained interest in the carbon community. Using UV–Vis–NIR spectroscopy and ultra-centrifugation, we have conducted a detailed study of the π plasmon energy (present at∼5–7eV) in sub-nm SWCNTs as a function of the size of the bundle. We find that the energy of the π plasmon peak E varies with the bundle diameter Dₕ as E=(-0.023eV)∗ln(Dₕ/dₒ)+5.37eV, where dₒ=0.5nm and corresponds to the smallest tube diameter.¹ This is compared with the same data for HiPCo and Carbolex SWCNTs of larger diameter (1–1.4nm) confirming a clear dependence of E on the bundle size, which is present in addition to the previously reported dependence of E on SWCNT diameter d.
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