Photoinduced band gap shift and deep levels in luminescent carbon nanotubes

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DOIResolve DOI: http://doi.org/10.1021/nn204679s
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TypeArticle
Journal titleACS Nano
Volume6
Issue2
Pages17021714; # of pages: 13
Subjectsingle-walled carbon nanotube; photoluminescence; exciton; quantum efficiency; band gap shift; van der Waals interaction
AbstractIndividual air-suspended single-walled carbon nanotubes are imaged both spatially and spectrally in photoluminescence. At low excitation power, photoluminescence is bright and stable with high quantum efficiency; however, higher power initially causes a gradual red shift and then more severe changes. Blinking, the loss of quantum efficiency, and the appearance of new deep levels are all seen and can be explained by the introduction of defects. We propose that optical excitation induces molecular deposition onto the nanotube by optically induced van der Waals interactions, leading to physisorption and ultimately chemisorption which severely degrades the luminescence.
Publication date
LanguageEnglish
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NPARC number20217045
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Record identifier1bf2b3ba-3f79-427b-9010-af2e7ce9a834
Record created2012-06-30
Record modified2016-05-09
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