Journal
ACS NANO
Volume 6, Issue 6, Pages 5083-5090Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn300753a
Keywords
ultrafast pump-probe spectroscopy; transient absorption microscopy; single-walled carbon nanotubes; excited-state dynamics; excited-state absorption
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Funding
- Office of Basic Energy Science of the U.S. Department of the Energy [DE-FC02-04ER15533]
- National Science Foundation [CHE-1110560]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1110560] Funding Source: National Science Foundation
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Femtosecond transient absorption microscopy was employed to study the excited-state dynamics of individual semiconducting single-walled carbon nanotubes (SWNTs) with simultaneously high spatial (similar to 200 nm) and temporal (similar to 300 fs) resolution. Isolated SWNTs were located using atomic force microscopy, and Raman spectroscopy was employed to determine the chiral index of select nanotubes. This unique experimental approach removes sample heterogeneity in ultrafast measurements of these complex materials. Transient absorption spectra of the individual SWNTs were obtained by recording transient absorption images at different probe wavelengths. These measurements provide new information about the origin of the photoinduced absorption features of SWNTs. Transient absorption traces were also collected for individual SWNTs. The dynamics show a fast, similar to 1 ps, decay for all the semiconducting nanotubes studied, which is significantly faster than the previously reported decay times for SWNT suspensions. We attributed this fast relaxation to coupling between the excitons created by the pump laser pulse and the substrate.
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