Effect of bundling on the π plasmon energy in sub-nanometer single wall carbon nanotubes

Autor:	Lisa D. Pfefferle, Codruta Zoican Loebick, Pengyu Chen, Brian A. Powell, Pu Chun Ke, Ramakrishna Podila, Apparao M. Rao, Kiran Lingam
Rok vydání:	2011
Předmět:	Tube diameter Materials science Analytical chemistry chemistry.chemical_element General Chemistry Carbon nanotube law.invention chemistry law Bundle General Materials Science Nanometre Spectroscopy Carbon Plasmon Energy (signal processing)
Zdroj:	Carbon. 49:3803-3807
ISSN:	0008-6223
DOI:	10.1016/j.carbon.2011.04.072
Popis:	Due to their unusual electronic and vibrational properties, single walled carbon nanotubes (SWCNTs) with sub-nanometer diameters d ∼ 0.5–0.9 nm 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∼5–7 eV) 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 D h as E = (-0.023 eV) ∗ ln( D h / d o ) + 5.37 eV, where d o = 0.5 nm and corresponds to the smallest tube diameter. 1 This is compared with the same data for HiPCo and Carbolex SWCNTs of larger diameter (1–1.4 nm) 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 .
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bc09bc6cbf954b090a05d01ff61d33f6 https://doi.org/10.1016/j.carbon.2011.04.072 Zobrazit plný text záznamu Full Text from ScienceDirect