Excitonic absorption spectra of metallic single-walled carbon nanotubes

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
Ermin Malic ◽  
Janina Maultzsch ◽  
Stephanie Reich ◽  
Andreas Knorr
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectra ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Excitonic Absorption ◽  
Walled Carbon Nanotubes

scholarly journals Absorption Properties of Hybrid Composites of Gold Nanorods and Functionalized Single-Walled Carbon Nanotubes

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Deok-Jin Yu ◽  
D. Ganta ◽  
Elijah Dale ◽  
A. T. Rosenberger ◽  
James P. Wicksted ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectra ◽  
Self Assembly ◽  
Hybrid Composites ◽  
Single Walled Carbon Nanotubes ◽  
Plasmon Mode ◽  
Absorption Properties ◽  
Au Nanorods ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

We report on the optical properties of fabricated nanohybrid structures containing Au nanorods and functionalized single-walled carbon nanotubes in aqueous solutions. In particular, the absorption spectra of these hybrid materials are studied as a function of the concentration of the functionalized single-walled carbon nanotubes as well as the evolution time following preparation. The absorption spectra show a red shift of the longitudinal plasmon mode of the Au nanorods along with the emergence of broadened structures at wavelengths between 1000 and 1100 nm. These results, supported by TEM images, indicate the self-assembly of the Au nanorods forming on the sidewalls of the functionalized SWNTs driven by polyelectrolyte interactions.

Assignment of the Fine Structure in the Optical Absorption Spectra of Soluble Single-Walled Carbon Nanotubes

2003 ◽  
Vol 107 (44) ◽  
pp. 12082-12087 ◽  
Author(s):  
Yongfu Lian ◽  
Yutaka Maeda ◽  
Takatsugu Wakahara ◽  
Takeshi Akasaka ◽  
Said Kazaoui ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fine Structure ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Single Walled Carbon Nanotubes ◽  
Optical Absorption Spectra ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

2009 ◽  
Vol 1230 ◽  
Author(s):  
Jigang Wang ◽  
Matt W. Graham ◽  
Yingzhong Ma ◽  
Graham R. Fleming ◽  
Robert A Kaindl
Keyword(s):  
Carbon Nanotubes ◽  
Transition Energy ◽  
Single Walled Carbon Nanotubes ◽  
Energy Response ◽  
Mid Infrared ◽  
Single Walled Carbon ◽  
Excitonic Absorption ◽  
Ir Studies ◽  
A Value ◽  
Walled Carbon Nanotubes

AbstractWe present femtosecond mid-infrared (mid-IR) studies of the broadband low-energy response of individualized (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed in these semiconducting tubes around 200 meV photon energy. The transition energy and broadly sloping spectral shape are characteristic of quasi 1D intra-excitonic transitions between different relative-momentum states. Our result yields a value of the intra-excitonic absorption cross section of σ∥MIR≈4×10-5.

scholarly journals Detection of Redox Properties of (6,5)-Enriched Single-Walled Carbon Nanotubes Using Potassium Permanganate (KMnO4)

2020 ◽  
Vol 6 (2) ◽  
pp. 30
Author(s):  
Yuji Matsukawa ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectra ◽  
Near Infrared ◽  
Single Walled Carbon Nanotubes ◽  
Redox Properties ◽  
Single Walled Carbon ◽  
Langmuir Adsorption ◽  
Oxidizing Power ◽  
Nir Absorption ◽  
Walled Carbon Nanotubes

It has been reported that even if single-walled carbon nanotubes (SWNTs) are coated with the same polymer, the redox characteristics change of each chirality may differ. Particularly, the addition of hydrogen peroxide (H2O2) minimally affects the near-infrared (NIR) absorption spectra of the dsDNA-(6,5)-enriched SWNT complex (DNA-SWNT complex). Detecting the redox properties of (6,5) chirality using NIR absorption spectra has been one of the issues to be solved. We hypothesized that an oxidizing agent with high oxidizing power is required to detect the absorption spectra of (6,5) chirality. In this study, we used KMnO4, which contains atoms with a high oxidation number. A dispersion was prepared by mixing 0.5 mg of (6,5)-enriched SWNT powder with 1 mg/mL of DNA solution. After adding H2O2 or KMnO4 to this dispersion and oxidizing it, catechin solutions were added to reduce the dispersion. The absorption peak of the DNA-SWNT complex decreased by 23.9% following the addition of KMnO4 (final concentration: 0.5 µM) and recovered 30.7% following the addition of the catechin solution. We revealed that the changes in the absorption spectra change of (6,5) chirality, which could not be detected by H2O2, can be detected by using KMnO4. We also varied the concentration of KMnO4 and verified whether the adsorption of KMnO4 can be modeled as a Langmuir adsorption isotherm.

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