Optical Absorption Spectroscopy of DNA-Wrapped HiPco Carbon Nanotubes

2019 ◽  
Vol 943 ◽  
pp. 95-99
Author(s):  
Li Jun Wang ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Optical Characterization ◽  
Optical Absorption Spectroscopy ◽  
Double Stranded Dna

Optical absorption spectroscopy provides evidence for individually dispersed carbon nanotubes. A common method to disperse SWCNTs into aqueous solution is to sonicate the mixture in the presence of a double-stranded DNA (dsDNA). In this paper, optical characterization of dsDNA-wrapped HiPco carbon nanotubes (dsDNA-SWCNT) was carried out using near infrared (NIR) spectroscopy and photoluminescence (PL) experiments. The findings suggest that SWCNT dispersion is very good in the environment of DNA existing. Additionally, its dispersion depends on dsDNA concentration.

scholarly journals Satellite monitoring of different vegetation types by differential optical absorption spectroscopy (DOAS) in the red spectral range

2007 ◽  
Vol 7 (1) ◽  
pp. 69-79 ◽  
Author(s):  
T. Wagner ◽  
S. Beirle ◽  
T. Deutschmann ◽  
M. Grzegorski ◽  
U. Platt
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Spectral Range ◽  
Near Infrared ◽  
Vegetation Type ◽  
Differential Optical Absorption Spectroscopy ◽  
Trace Gas ◽  
Satellite Monitoring ◽  
Optical Absorption Spectroscopy ◽  
Vegetation Types

Abstract. A new method for the satellite remote sensing of different types of vegetation and ocean colour is presented. In contrast to existing algorithms relying on the strong change of the reflectivity in the red and near infrared spectral region, our method analyses weak narrow-band (few nm) reflectance structures (i.e. "fingerprint" structures) of vegetation in the red spectral range. It is based on differential optical absorption spectroscopy (DOAS), which is usually applied for the analysis of atmospheric trace gas absorptions. Since the spectra of atmospheric absorption and vegetation reflectance are simultaneously included in the analysis, the effects of atmospheric absorptions are automatically corrected (in contrast to other algorithms). The inclusion of the vegetation spectra also significantly improves the results of the trace gas retrieval. The global maps of the results illustrate the seasonal cycles of different vegetation types. In addition to the vegetation distribution on land, they also show patterns of biological activity in the oceans. Our results indicate that improved sets of vegetation spectra might lead to more accurate and more specific identification of vegetation type in the future.

Use of optical absorption spectroscopy for the characterization of an Ar−Ti magnetron discharge

2007 ◽  
Vol 13 (6) ◽  
pp. 483-488 ◽  
Author(s):  
Nikolay Britun ◽  
Mireille Gaillard ◽  
Yong Mo Kim ◽  
Kab Seog Kim ◽  
Jeon-Geon Han
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Optical Absorption Spectroscopy ◽  
Magnetron Discharge

A reference material of single-walled carbon nanotubes: quantitative chirality assessment using optical absorption spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 102974-102980 ◽  
Author(s):  
Ying Tian ◽  
Hua Jiang ◽  
Ilya V. Anoshkin ◽  
Lauri. J. I. Kauppinen ◽  
Kimmo Mustonen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Absorption Spectrum ◽  
Reference Material ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Spectrum Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Optical Absorption Spectroscopy ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

A quantitative chirality assessment of a SWCNT reference material is presented by using an enhanced method for absorption spectrum analysis.

scholarly journals Chirality Characterization of Dispersed Single Wall Carbon Nanotubes

2005 ◽  
Vol 872 ◽  
Author(s):  
Min Namkung ◽  
Phillip A. Williams ◽  
Candis D. Mayweather ◽  
Buzz Wincheski ◽  
Cheol Park ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Optical Absorption ◽  
Raman Scattering ◽  
Scattering Data ◽  
Resonant Peak ◽  
Optical Absorption Spectroscopy ◽  
Single Wall Carbon Nanotubes ◽  
Sodium Dodecylbenzene Sulfonate ◽  
Single Wall Carbon

AbstractRaman scattering and optical absorption spectroscopy are used for the chirality characterization of HiPco single wall carbon nanotubes (SWNTs) dispersed in aqueous solution with the surfactant sodium dodecylbenzene sulfonate. Radial breathing mode (RBM) Raman peaks for semiconducting and metallic SWNTs are identified by directly comparing the Raman spectra with the Kataura plot. The SWNT diameters are calculated from these resonant peak positions. Next, a list of (n, m) pairs, yielding the SWNT diameters within a few percent of that obtained from each resonant peak position, is established. The interband transition energies for the list of SWNT (n, m) pairs are calculated based on the tight binding energy expression for each list of the (n, m) pairs, and the pairs yielding the closest values to the corresponding experimental optical absorption peaks are selected. The results reveal (1, 11), (4, 11), (5, 12), and (5, 9) among the most probable chiralities for the semiconducting nanotubes. The results also reveal that (4, 16), (6, 12) and (8, 8) are the most probable chiralities for the metallic nanotubes. Directly relating the Raman scattering data to the optical absorption spectra, the present method is considered the simplest technique currently available. Another advantage of this technique is the use of the, E11S, E33S, and E22M peaks in the optical absorption spectrum in the analysis to enhance the accuracy in the results.

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