The unique physical and chemical properties of single-walled carbon nanotubes (SWCNTs) continue to inspire extensive research by many basic and applied researchers. One of the most remarkable features of SWCNTs is their variety of pi-electronic structures associated with specific diameters and roll-up angles. Approximately two-thirds of these structural species are semiconducting and display near-infrared photoluminescence (fluorescence) through direct band gap transitions. I will describe the discovery of this SWCNT fluorescence and the assignment of specific spectral features to physical nanotube structures. Several illustrations of using SWCNT emission spectroscopy in research will then be described, including characterizing sample compositions, capturing images and spectra of single nanotubes in physical and biological environments, and guiding covalent tailoring of nanotube excitonic properties. Finally, I will present an update on an emerging technology for industrial strain measurement that uses SWCNTs as strain sensors that report through spectral shifts in their emission spectra.
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R. Bruce Weisman (2024) studied this question.
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