期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 249, 期 12, 页码 2436-2441出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201200152
关键词
carbon nanotubes; excitons; Raman scattering; Rayleigh scattering
资金
- Nanoscale Science and Engineering Initiative of the NSF [CHE-0117752]
- Nanoelectronics Research Initiative of the Semiconductor Research Corporation (NRI-SRC)
- U.S. Department of Energy, Basic Energy Sciences [DE-FG02-07ER15842]
- W. M. Keck Foundation
- Grants-in-Aid for Scientific Research [24681031] Funding Source: KAKEN
We present an all-optical method for structure assignment of individual single-walled carbon nanotubes (SWNTs) based on combined measurements of the elastically (Rayleigh) and inelastically (Raman) scattered light by individual freestanding specimens. The optical resonances of a single SWNT are identified from the Rayleigh spectra. These measurements are complemented with an independent estimation of the SWNT diameter and chiral angle from its radial breathing and G Raman modes, respectively. An assignment of the (n,m) chiral indices can thus be provided. In the most simple cases, a reliable structure assignment can be inferred from the Rayleigh spectra alone. However, we also show that SWNTs with different structures may display similar Rayleigh spectra within a given photon energy window. In these situations, Raman measurements provide unambiguous criteria for a proper structure assignment. This approach is particularly helpful in order to identify the high-symmetry armchair and zig-zag structures.
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