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Unified Quantification of Quantum Defects in Small-Diameter Single-Walled Carbon Nanotubes by Raman Spectroscopy.
Sebastian, Finn L; Becker, Felicitas; Yomogida, Yohei; Hosokawa, Yuuya; Settele, Simon; Lindenthal, Sebastian; Yanagi, Kazuhiro; Zaumseil, Jana.
Afiliação
  • Sebastian FL; Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany.
  • Becker F; Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany.
  • Yomogida Y; Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Hosokawa Y; Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Settele S; Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany.
  • Lindenthal S; Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany.
  • Yanagi K; Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Zaumseil J; Institute for Physical Chemistry, Universität Heidelberg, D-69120 Heidelberg, Germany.
ACS Nano ; 17(21): 21771-21781, 2023 Nov 14.
Article em En | MEDLINE | ID: mdl-37856164
ABSTRACT
The covalent functionalization of single-walled carbon nanotubes (SWCNTs) with luminescent quantum defects enables their application as near-infrared single-photon sources, as optical sensors, and for in vivo tissue imaging. Tuning the emission wavelength and defect density is crucial for these applications. While the former can be controlled by different synthetic protocols and is easily measured, defect densities are still determined as relative rather than absolute values, limiting the comparability between different nanotube batches and chiralities. Here, we present an absolute and unified quantification metric for the defect density in SWCNT samples based on Raman spectroscopy. It is applicable to a range of small-diameter semiconducting nanotubes and for arbitrary laser wavelengths. We observe a clear inverse correlation of the D/G+ ratio increase with nanotube diameter, indicating that curvature effects contribute significantly to the defect activation of Raman modes. Correlation of intermediate frequency modes with defect densities further corroborates their activation by defects and provides additional quantitative metrics for the characterization of functionalized SWCNTs.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: ACS Nano Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Alemanha

Texto completo: 1 Base de dados: MEDLINE Idioma: En Revista: ACS Nano Ano de publicação: 2023 Tipo de documento: Article País de afiliação: Alemanha