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Chirality-independent characteristic crystal length in carbon nanotube textiles measured by Raman spectroscopy

Bulmer, John S.; Gspann, Thurid S.; Barnard, Jon S.; Elliott, James A.

Abstract:
Raman spectroscopy's D:G ratio is a well-known indicator of graphitic crystallinity in single-wall carbon nanotubes (SWCNTs) with widespread qualitative application to macroscopic CNT assemblies. Here, we show how the D:G ratio yields quantitative characteristic crystal length features that is remarkably independent of SWCNT chirality when purified SWCNTs are in a high density, heavily bundled textile form. Purified, unaligned, SWCNT films of enriched length distributions and controlled chirality responded in ways consistent with power law behaviour, where the D:G ratio is proportional to the fourth power of excitation wavelength, inversely proportional to SWCNT length, and fits to a master curve independent of electronic species concentration. This behaviour, matching the established response of graphite and graphene, unexpectedly persists despite complications from chirality-dependent resonances unique to SWCNTs. We also show that textiles comprising of aligned, long length CNTs defy these simple power laws until defective multiwall CNTs and impurities are removed post-process, and only if sample heating under the Raman laser is minimized. ... mehr

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Originalveröffentlichung
DOI: 10.1016/j.carbon.2017.01.044
Scopus
Zitationen: 11
Web of Science
Zitationen: 11
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 05.2017
Sprache Englisch
Identifikator ISSN: 0008-6223
KITopen-ID: 1000122465
Erschienen in Carbon
Band 115
Seiten 672–680
Nachgewiesen in Web of Science
Scopus
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