Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes

Michael S. Arnold; Jay E. Sharping; Samuel I. Stupp; Prem Kumar; Mark C. Hersam

doi:10.1021/nl034726f

Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes

Michael S. Arnold, Jay E. Sharping, Samuel I. Stupp, Prem Kumar, Mark C. Hersam

Northwestern University

Research output: Contribution to journal › Article

50 Citations (Scopus)

Abstract

Using pump-probe characterization, band gap photobleaching has been observed from semiconducting single-walled carbon nanotubes (SWNTs) isolated in aqueous suspensions in an effort to evaluate SWNTs as a near-infrared optical material. The measured photobleaching was optimized for co-polarization of pump and probe lasers in resonance with the second and first van Hove transitions, respectively. A saturation of photobleaching intensity was observed for large pump intensities greater than ∼1 kW cm^-2 and for probe intensities approaching ∼500 W cm^-2. The observed photobleaching is attributed to the relaxation of excited electron-hole pairs to the band edges, resulting in decreased absorption and increased stimulated emission.

Original language	English
Pages (from-to)	1549-1554
Number of pages	6
Journal	Nano letters
Volume	3
Issue number	11
DOIs	https://doi.org/10.1021/nl034726f
Publication status	Published - Nov 1 2003

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ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

Cite this

Arnold, M. S., Sharping, J. E., Stupp, S. I., Kumar, P., & Hersam, M. C. (2003). Band Gap Photobleaching in Isolated Single-Walled Carbon Nanotubes. Nano letters, 3(11), 1549-1554. https://doi.org/10.1021/nl034726f

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10.1021/nl034726f