Enhancement of the Electron Spin Resonance of Single-Walled Carbon Nanotubes by Oxygen Removal

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dc.citation.firstpage2165en_US
dc.citation.issueNumber3en_US
dc.citation.journalTitleACS Nanoen_US
dc.citation.lastpage2173en_US
dc.citation.volumeNumber6en_US
dc.contributor.authorRice, William D.en_US
dc.contributor.authorWeber, Ralph T.en_US
dc.contributor.authorLeonard, Ashley D.en_US
dc.contributor.authorTour, James M.en_US
dc.contributor.authorNikolaev, Pavelen_US
dc.contributor.authorArepalli, Sivaramen_US
dc.contributor.authorBerka, Vladimiren_US
dc.contributor.authorTsai, Ah-Limen_US
dc.contributor.authorKono, Junichiroen_US
dc.date.accessioned2016-07-08T16:43:04Zen_US
dc.date.available2016-07-08T16:43:04Zen_US
dc.date.issued2012en_US
dc.description.abstractWe have observed a nearly 4-fold increase in the electron spin resonance (ESR) signal from an ensemble of single-walled carbon nanotubes (SWCNTs) due to oxygen desorption. By performing temperature-dependent ESR spectroscopy both before and after thermal annealing, we found that the ESR in SWCNTs can be reversibly altered via the molecular oxygen content in the samples. Independent of the presence of adsorbed oxygen, a Curie law (spin susceptibility ∝ 1/T) is seen from ∼4 to 300 K, indicating that the probed spins are finite-level species. For both the pre-annealed and post-annealed sample conditions, the ESR line width decreased as the temperature was increased, a phenomenon we identify as motional narrowing. From the temperature dependence of the line width, we extracted an estimate of the intertube hopping energy; for both sample conditions, we found this hopping energy to be ∼1.2 meV. Since the spin hopping energy changes only slightly when oxygen is desorbed, we conclude that only the spin susceptibility, not spin transport, is affected by the presence of physisorbed molecular oxygen in SWCNT ensembles. Surprisingly, no line width change is observed when the amount of oxygen in the SWCNT sample is altered, contrary to other carbonaceous systems and certain 1D conducting polymers. We hypothesize that physisorbed molecular oxygen acts as an acceptor (p-type), compensating the donor-like (n-type) defects that are responsible for the ESR signal in bulk SWCNTs.en_US
dc.identifier.citationRice, William D., Weber, Ralph T., Leonard, Ashley D., et al.. "Enhancement of the Electron Spin Resonance of Single-Walled Carbon Nanotubes by Oxygen Removal." <i>ACS Nano,</i> 6, no. 3 (2012) American Chemical Society: 2165-2173. http://dx.doi.org/10.1021/nn204094s.en_US
dc.identifier.doihttp://dx.doi.org/10.1021/nn204094sen_US
dc.identifier.urihttps://hdl.handle.net/1911/90844en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.en_US
dc.subject.keywordelectron spin resonanceen_US
dc.subject.keywordoxygen desorptionen_US
dc.subject.keywordsingle-walled carbon nanotubesen_US
dc.titleEnhancement of the Electron Spin Resonance of Single-Walled Carbon Nanotubes by Oxygen Removalen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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