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dc.contributor.authorStreit, Jason K.
Bachilo, Sergei M.
Sanchez, Stephen R.
Lin, Ching-Wei
Weisman, R. Bruce
dc.date.accessioned 2015-10-01T15:40:10Z
dc.date.available 2015-10-01T15:40:10Z
dc.date.issued 2015
dc.identifier.citation Streit, Jason K., Bachilo, Sergei M., Sanchez, Stephen R., et al.. "Variance Spectroscopy." The Journal of Physical Chemistry Letters, 6, no. 19 (2015) American Chemical Society: 3976-3981. http://dx.doi.org/10.1021/acs.jpclett.5b01835.
dc.identifier.urihttps://hdl.handle.net/1911/81855
dc.description.abstract Spectroscopic analysis and study of nanoparticle samples is often hampered by structural diversity that presents a complex superposition of spectral signatures. By probing the spectra of small volumes within dilute samples, we can expose statistical variations in composition to obtain information unavailable from bulk spectroscopy. This new approach is demonstrated using fluorescence spectra of unsorted single-walled carbon nanotube samples to deduce structure-specific abundances and emissive efficiencies. Furthermore, correlations between intensity variations at different wavelengths provide two-dimensional covariance maps that isolate the spectra of homogeneous subpopulations. Covariance analysis is also a sensitive probe of particle aggregation. It shows that well-dispersed nanotube samples can spontaneously form loose aggregates of a type not previously recognized. Variance spectroscopy is a simple and practical technique that should find application in many nanoparticle studies.
dc.language.iso eng
dc.publisher American Chemical Society
dc.rights This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
dc.rights.urihttp://pubs.acs.org/page/policy/authorchoice_termsofuse.html
dc.title Variance Spectroscopy
dc.type Journal article
dc.contributor.funder National Science Foundation
dc.contributor.funder Welch Foundation
dc.citation.journalTitle The Journal of Physical Chemistry Letters
dc.contributor.org Smalley-Curl Institute
dc.subject.keywordspatial fluctuation spectroscopy
single-walled carbon nanotubes
fluorescence
covariance spectra
nanotube aggregation
dc.citation.volumeNumber 6
dc.citation.issueNumber 19
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1021/acs.jpclett.5b01835
dc.identifier.grantID CHE-1409698 (National Science Foundation)
dc.identifier.grantID C-0807 (Welch Foundation)
dc.identifier.grantID CHE-1401269 (National Science Foundation)
dc.identifier.grantID HER-0966303 (National Science Foundation)
dc.type.publication publisher version
dc.citation.firstpage 3976
dc.citation.lastpage 3981


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