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dc.contributor.authorRice, William D.
Weber, Ralph T.
Leonard, Ashley D.
Tour, James M.
Nikolaev, Pavel
Arepalli, Sivaram
Berka, Vladimir
Tsai, Ah-Lim
Kono, Junichiro
dc.date.accessioned 2016-06-08T16:16:52Z
dc.date.available 2016-06-08T16:16:52Z
dc.date.issued 2012
dc.identifier.citation Rice, William D., Weber, Ralph T., Leonard, Ashley D., et al.. "Enhancement of the Electron Spin Resonance of Single-Walled Carbon Nanotubes by Oxygen Removal." ACS Nano, 6, no. 3 (2012) American Chemical Society: 2165-2173. http://dx.doi.org/10.1021/nn204094s.
dc.identifier.urihttps://hdl.handle.net/1911/90464
dc.description.abstract We 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.
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.
dc.title Enhancement of the Electron Spin Resonance of Single-Walled Carbon Nanotubes by Oxygen Removal
dc.type Journal article
dc.contributor.funder U.S. Department of Energy Basic Energy Sciences
dc.contributor.funder Welch Foundation
dc.contributor.funder Air Force Research Laboratories
dc.contributor.funder W.M. Keck Program in Quantum Materials at Rice University
dc.contributor.funder Korean Ministry of Education, Science and Technology, World Class University Program
dc.citation.journalTitle ACS Nano
dc.subject.keywordelectron spin resonance
single-walled carbon nanotubes
oxygen desorption
dc.citation.volumeNumber 6
dc.citation.issueNumber 3
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1021/nn204094s
dc.identifier.pmid 22324937
dc.identifier.grantID DEFG02-06ER46308 (U.S. Department of Energy Basic Energy Sciences)
dc.identifier.grantID C-1509 (Welch Foundation)
dc.identifier.grantID FA8650-05-D-5807 (Air Force Research Laboratories)
dc.identifier.grantID R31-2008-10029 (Korean Ministry of Education, Science and Technology, World Class University Program)
dc.type.publication post-print
dc.citation.firstpage 2165
dc.citation.lastpage 2173


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