Raman Spectroscopy and TEM of Long Linear Carbon Chain Formed in CNT Field Emission Cathode
Open Access
- 23 April 2020
- journal article
- research article
- Published by Surface Science Society Japan in e-Journal of Surface Science and Nanotechnology
- Vol. 18, 159-163
- https://doi.org/10.1380/ejssnt.2020.159
Abstract
Long linear carbon chains (LCCs) encapsulated in carbon nanotubes (CNTs) were produced on a film scale by field emission discharge of CNT films. LCCs inside CNTs were characterized by Raman spectroscopy and transmission electron microscopy. After an electric discharge of a CNT film cathode, long LCCs encapsulated in single-wall CNTs as well as double-wall and triple-wall CNTs were formed in the film. The length of LCCs is longer than 30 nm (i.e., more than 230 carbon atoms). Not only a single LCC but also two or three LCCs in parallel inside a CNT were found. Raman spectra showed prominent peaks, called "LCC bands", in a region from 1790 to 1860 cm(-1) originating from longitudinal optical phonons of LCCs. The observation of strong LCC bands are due to resonance Raman scattering, i.e., the excitation photon energies between 1.85-2.54 eV match with energy gaps of the long LCCs inside CNTs.Keywords
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