Characterization of Carbon Nanotubes by Optical Spectroscopy

Maultzsch, Janina; Thomsen, C.

doi:10.1002/9783527622597.ch4

“…Die Intensitäten sind zur besseren Sichtbarkeit beliebig skaliert. Die Spektren von Nanoröhrenbündeln zeigen die typischen Raman‐Moden von einwandigen Kohlenstoff‐Nanoröhren [51,52] . Histogramme, die die Veränderung der b) D, c) G+ und d) 2D‐Modenposition mit der Funktionalisierung darstellen.…”

Section: Figureunclassified

Simultane Funktionalisierung von Einwandigen Kohlenstoff‐Nanoröhren von Innen und Außen

Kraus,

Meingast,

Hald

et al. 2024

Angewandte Chemie

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Functionalizing single‐walled carbon nanotubes (SWCNTs) in a robust way that does not affect the sp2 carbon framework is a considerable research challenge. Here we describe how triiodide salts of positively charged macrocycles can be used not only to functionalize SWCNTs from the outside, but simultaneously from the inside. We employed disulfide exchange in aqueous solvent to maximize the solvophobic effect and therefore achieve a high degree of macrocycle immobilization. Characterization by Raman spectroscopy, EDX‐STEM and HR‐TEM clearly showed that serendipitously this wet‐chemical functionalization protocol also led to the encapsulation of polyiodide chains inside the nanotubes. The resulting three‐shell composite materials are redoxactive and experience an intriguing interplay of electrostatic, solvophobic and mechanical effects that could be of interest for applications in energy storage.

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“…Intensities are scaled arbitrarily for better visibility. The spectra from nanotube bundles show the typical Raman modes of single‐walled carbon nanotubes [51,52] . Histograms presenting the change of b) the D, c) the G + and d) the 2D mode position with functionalization.…”

Section: Figurementioning

confidence: 99%

“…a) Representative Raman spectra of all carbon nanotube samples (blue: Source, orange: MINT-1, red: MINT-2), measured with 633 nm excitation. Intensities are scaled arbitrarily for better visibility.The spectra from nanotube bundles show the typical Raman modes of single-walled carbon nanotubes [51,52]. Histograms presenting the change of b) the D, c) the G + and d) the 2D mode position with functionalization.…”

mentioning

confidence: 99%

Simultaneous Inside and Outside Functionalization of Single‐Walled Carbon Nanotubes

Kraus,

Meingast,

Hald

et al. 2024

Angew Chem Int Ed

0

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Functionalizing single‐walled carbon nanotubes (SWCNTs) in a robust way that does not affect the sp2 carbon framework is a considerable research challenge. Here we describe how triiodide salts of positively charged macrocycles can be used not only to functionalize SWCNTs from the outside, but simultaneously from the inside. We employed disulfide exchange in aqueous solvent to maximize the solvophobic effect and therefore achieve a high degree of macrocycle immobilization. Characterization by Raman spectroscopy, EDX‐STEM and HR‐TEM clearly showed that serendipitously this wet‐chemical functionalization protocol also led to the encapsulation of polyiodide chains inside the nanotubes. The resulting three‐shell composite materials are redoxactive and experience an intriguing interplay of electrostatic, solvophobic and mechanical effects that could be of interest for applications in energy storage.

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