Optical circular dichroism of single-wall carbon nanotubes

Sánchez-Castillo, A.; Román-Velázquez, C. E.; Noguez, Cecilia

doi:10.1103/physrevb.73.045401

Cited by 47 publications

(50 citation statements)

References 43 publications

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“…46 For example, the CDs corresponding to (6,5)-SWNTs are observed at 341 and 562 nm as shown in Figures 5a and 5b. (6,5)-SWNTs extracted with (R)-1 and -2 exhibit (+, ¹) alternate signs at 341 and 562 nm, while those extracted with the corresponding (S)-stereoisomers show (¹, +) signs at the same wavelengths. These alternate features of CD are consistent with the theoretical prediction, 1,36,47,48 hence, indicating optical activities of the extracted SWNTs. 4 The second nanotweezers 2, with narrower dihedral angle and slightly shorter ZnZn distance shown in Table 1 and Figure 4, enhanced the optical enrichment of (6,5)-SWNTs (Figure 5b).…”

Section: ç Optical Enrichmentsupporting

confidence: 89%

“…1,36 The (n,m) and C h have been referred to as the chiral index (or simply chirality) and the chiral vector, respectively. However, the meaning of chiral in this context is different from the original meaning defined by the International Union of Pure and Applied Chemistry (IUPAC); that is, "the geometric properties of a rigid object of being nonsuperposable on its mirror image.…”

Section: ç Structures Of Swntsmentioning

confidence: 99%

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Optical Resolution of Single-Walled Carbon Nanotubes through Molecular Recognition with Chiral Diporphyrin Nanotweezers

Peng¹,

Wang²,

Bauri³

et al. 2010

Chemistry Letters

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Single-walled carbon nanotubes (SWNTs) have either chiral or achiral form, and synthesized chiral SWNTs include both leftand right-handed structures in equal amounts. Recently, a racemic mixture was found to be resolved through molecular recognition with gable-type chiral diporphyrins, namely, nanotweezers. This novel separation method for SWNTs allowed optical resolution of SWNTs for the first time. The chiral nanotweezers consist of two chiral porphyrins and rigid spacer in between. Therefore, they have potential to discriminate not only the handedness but also the diameters or alignments of the hexagons of SWNTs. We have prepared the following three types of chiral nanotweezers; m-phenylene-, 2,6-pyridylene-, and 3,6-carbazolylene-bridged diporphyrins. In the extraction of SWNTs, different selectivities have been observed among the nanotweezers. This can be attributed to the differences in their structures; namely, the dihedral angles and the distance of the two porphyrins. In this review, we would like to discuss the relationship between the structures of the nanotweezers and the results of the optical and (n,m) enrichments of the extracted SWNTs.

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Section: ç Optical Enrichmentsupporting

confidence: 89%

Section: ç Structures Of Swntsmentioning

confidence: 99%

Optical Resolution of Single-Walled Carbon Nanotubes through Molecular Recognition with Chiral Diporphyrin Nanotweezers

Peng¹,

Wang²,

Bauri³

et al. 2010

Chemistry Letters

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“…The method uses the standard Kohn-Sham self-consistent DFT in the local density approximation (LDA) or generalized gradient approximation (GGA), norm-conserving pseudopotentials in its fully non-local form, atomic orbitals as basis set, allowing unlimited multiple-z and angular momenta, polarization and off-site orbitals [67]. The siesta code has been successfully used to study the atomic, electronic, and optical properties of different carbon nanostructures [68,69], and recently to demonstrate the hydrogenation of the C 60 fullerene by diethylenetriamine reagent [70]. To show the applicability of the time-perturbed DFT method to large nanostructures, we present results for the C 84 fullerene.…”

Section: Original Papermentioning

confidence: 99%

Optically active nanoparticles: Fullerenes, carbon nanotubes, and metal nanoparticles

Hidalgo

Noguez

2010

Physica Status Solidi (b)

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, Phone: þ52 55 5622 5106, Fax: þ52 55 5616 1535A brief topical review of the optical activity of fullerenes, carbon nanotubes, and metallic clusters, is given. Using a recently developed first-principles formalism, the particular case of the optical activity of the chiral C 84 fullerene with D 2 symmetry is studied in detail. In particular, the optical activity of the four possible isomers with this symmetry is studied by calculating the electronic circular dichroism (CD) and compared with experimental data. Although a similar line shape is found for the lowest-energy isomer, the width and intensity of the main experimental peaks are not well reproduced. On the other hand, it is found that the average CD of the mixture of the three lower-energy isomers is in better agreement with experiments. It is expected that this review would be useful as an introduction to optical activity at the nanometer scale, and motivate further experimental studies and the interpretation of natural optical activity in nanoparticles.Calculated CD of a mixture of different isomers of the fullerene C 84 with D 2 symmetry by using DFT and its comparison with experiment.

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“…[3] For single-walled CNTs, many intermediate structures between armchair and zigzag (two achiral structures) are chiral. Multiwall CNTs (MWNTs) are often achiral because of the independent chirality of each successive tubular layer, thus single chirality is rare, although in some cases there may be a limited range of chirality amongst the layers of multiwalled tubes or doped tubes.…”

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confidence: 99%

Chiral Polymer–Carbon‐Nanotube Composite Nanofibers

Zhang

Song

Harris³

et al. 2007

Advanced Materials

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Optically active polyaniline–carbon‐nanotube nanocomposites are synthesized by using a solution‐chemistry method. The stereochemical selectivity of the composites can be tailored by controlling the nanotube loading. At low nanotube contents (<3 wt %), the chiral composites show high absolute stereochemical selectivity. The figure shows normalized circular dichroism spectra of the composites with different nanotube/monomer weight ratios in aqueous solutions.

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Optical circular dichroism of single-wall carbon nanotubes

Cited by 47 publications

References 43 publications

Optical Resolution of Single-Walled Carbon Nanotubes through Molecular Recognition with Chiral Diporphyrin Nanotweezers

Optical Resolution of Single-Walled Carbon Nanotubes through Molecular Recognition with Chiral Diporphyrin Nanotweezers

Optically active nanoparticles: Fullerenes, carbon nanotubes, and metal nanoparticles

Chiral Polymer–Carbon‐Nanotube Composite Nanofibers

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