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Electron spin resonance from semiconductor–metal separated SWCNTs
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Personen und Körperschaften: | , , , , , , , , , |
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Titel: |
Electron spin resonance from semiconductor–metal separated SWCNTs |
In: | physica status solidi (b), 247, 2010, 11-12, S. 2851-2854 |
veröffentlicht: |
Wiley
|
Umfang: | 2851-2854 |
ISSN: |
0370-1972 1521-3951 |
DOI: | 10.1002/pssb.201000317 |
Zusammenfassung: | <jats:title>Abstract</jats:title><jats:p>Electron spin resonance in the X band is reported for fully metal–semiconductor separated SWCNTs. For the experiments samples were immersed in ethanol or wrapped into a teflon foil. The response from the metallic tubes exhibits a strong asymmetry in the line shape whereas the asymmetry for the semiconducting (SC) tubes is comparatively small. In both cases the line widths are unusual small, of the order of 4 G. Particular attention is paid to SC nanotubes which exhibit a much stronger signal as compared to the metallic tubes. The signal intensity is nearly Curie like with a small enhancement beyond <jats:styled-content>$1/T$<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-1.gif" xlink:title="equation image" /></jats:styled-content> in the low temperature range. The <jats:styled-content>$1/T$<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/tex2gif-ueqn-2.gif" xlink:title="equation image" /></jats:styled-content> behavior renders the ESR response unobservable at 300 K. The finite value for the asymmetry parameter in the SC tubes is assumed to originate from charges picked up during exposure to air or to ethanol.</jats:p> |
Format: | E-Article |
Quelle: | Wiley (CrossRef) |
Sprache: | Englisch |