Raman spectroscopy of iodine-doped double-walled carbon nanotubes

Cambedouzou, Julien; Sauvajol, Jean‐Louis; Rahmani, A.; Flahaut, Emmanuel; Peigney, Alain; Laurent, Césari

doi:10.1103/physrevb.69.235422

Cited by 82 publications

(79 citation statements)

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“…A similar effect has been observed for iodine-doped DWNTs. 13 The effect of charge transfer on the electronic transition energies is small for large diameter tubes. Therefore, the intensity of the Raman spectra for the large diameter outer tubes is expected not to vary so much, which is in agreement with the results shown in Figs.…”

Section: G-band Analysismentioning

confidence: 99%

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Resonance Raman scattering studies inBr2-adsorbed double-wall carbon nanotubes

et al. 2006

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The vibrational and electronic properties of Br 2 -adsorbed double-wall carbon nanotubes ͑DWNTs͒ were investigated by resonance Raman scattering. Special attention was given to distinguish the behavior between S/M and M/S outer/inner semiconducting ͑S͒ and metallic ͑M͒ tubes. By using three laser excitation energies 2.33, 1.96, and 1.58 eV, resonance Raman spectra were obtained for the DWNTs before and after bromine adsorption, and also for the Br-Br molecular resonance, thereby facilitating the study of charge transfer between the DWNTs and the bromine. It was found that Br 2 molecules act as acceptors and that metallic nanotubes are specially sensitive to the presence of Br 2 molecules even when they constitute the inner tubes of DWNTs.

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Section: G-band Analysismentioning

confidence: 99%

“…6,[11][12][13] In particular, the effects of the Br 2 interaction with carbon nanotubes have been reported for SWNTs ͑Ref. 5͒ and more recently for DWNTs.…”

Section: Introductionmentioning

confidence: 99%

Resonance Raman scattering studies inBr2-adsorbed double-wall carbon nanotubes

et al. 2006

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“…3 Pairs of tubes in DWCNTs can also be evidenced through Raman radial breathing mode ͑RBM͒ frequencies. 1,2,8,14 However, this technique is not straightforward for giving a quantitative characterization of a sample due to resonance effects, which make a large number of nanotubes invisible in the Raman response of a sample. Moreover, the penetration depth of visible lasers into nanotubes is too low to allow a global characterization of a macroscopic sample.…”

Section: Introductionmentioning

confidence: 99%

X-ray diffraction as a tool for the determination of the structure of double-walled carbon nanotube batches

et al. 2009

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The average structure of double-walled carbon nanotube ͑DWCNT͒ samples can be determined by x-ray diffraction ͑XRD͒. We present a formalism that allows XRD patterns of DWCNTs to be simulated and we give researchers the tools needed to perform these calculations themselves. Simulations of XRD patterns within this formalism are compared to experimental data obtained on two different DWCNT samples, produced by chemical vapor deposition or by peapod conversion ͑i.e., high-temperature peapod annealing͒. For each sample, we are able to determine structural aspects such as the number of walls, the diameter distribution of inner and outer tubes, the intertube spacing, and the bundled structure.

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“…Semelhante à química de intercalação do grafite, os nanotubos de carbono também têm sido intercalados com espécies receptoras, tais como os elementos halogênios 49,53,54 . Estudos de espectroscopia Raman ressonante mostram que nanotubos interagindo com I 2 e Br 2 atuam como doadores de carga para essas moléculas 49 .…”

Section: Figura 3 Densidade De Estados Eletrônicos Para Swnts Semicounclassified

Funcionalização de nanotubos de Carbono

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Fagan

2007

Quím. Nova

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Recebido em 28/7/06; aceito em 18/1/07; publicado na web em 25/9/07 FUNCTIONALIZATION OF CARBON NANOTUBES. Carbon nanotubes are very stable systems having considerable chemical inertness due to the strong covalent bonds of the carbon atoms on the nanotube surface. Many applications of carbon nanotubes require their chemical modification in order to tune/control their physico-chemical properties. One way of achieving this control is carrying out functionalization processes where atoms and molecules interact (covalent or non-covalent) with the nanotubes. We review some of the progress that has been made in chemical functionalization of carbon nanotubes. Emphasis is given to chemical strategies, the most used techniques, and applications.Keywords: carbon nanotubes; functionalization; nanomaterials. INTRODUÇÃOOs nanomateriais, em geral, são muito importantes porque se diferenciam de forma dramática dos seus precursores "bulk". As propriedades destes materiais são determinadas pelo tamanho e pela morfologia, originando uma fascinante sintonia em suas propriedades físico-químicas. Talvez os exemplos mais claros e ilustrativos desses fenômenos possam ser tomados da ciência do carbono após a descoberta dos fulerenos, em 1985 1 , e dos nanotubos de carbono, em 1991 2 . Os nanotubos de carbono, assunto dessa revisão, são sistemas modelo para a nanociência e a nanotecnologia. Essas novas estruturas de carbono são bastante versáteis para se integrarem a diferentes áreas do conhecimento e são capazes de promover uma inter/multidisciplinaridade muito forte. Hoje, as pesquisas em nanotubos de carbono cruzam as fronteiras da física, da química, das ciências dos materiais, da biologia e desenvolvem-se rapidamente no campo da farmacologia.Os nanotubos de carbono, quanto ao número de camadas, podem ser classificados em duas formas: nanotubos multicamadas ("multi-wall carbon nanotubes -MWNTs") e camada simples ("single-wall carbon nanotubes -SWNTs"). Um tipo especial de MWNT é o nanotubo de parede dupla ("double-wall carbon nanotubes -DWNTs"). Uma ou outra forma de nanotubos apresenta-se mais apropriada dependendo da aplicação desejada. Os MWNTs foram observados pela primeira vez por Iijima 2 , em 1991. Dois anos depois, em contribuições independentes, Iijima e colaboradores 3 no Japão e Bethune e colaboradores 4 nos EUA publicaram simultaneamente a síntese dos SWNTs. Recentemente debate-se a quem devem ser atribuídos os créditos da descoberta dos nanotubos de carbono 5 . Entretanto, não há dúvidas que a área de pesquisa em nanotubos consolida-se após o trabalho de Iijima 2 . A Figura 1 mostra imagens de microscopia eletrônica de transmissão (TEM) de MWNTs, DWNTs e SWNTs. O avanço das pesquisas em nanotubos de carbono foi claramente impulsionado pelo desenvolvimento dos processos de síntese, levando à produção de feixes de nanotubos do tipo SWNT com boa qualidade. Esse avanço foi realizado pelo grupo do Prof. Smalley na Rice University 6 e tornou possível a execução de estudos de microscopia 7,8 e de espectroscopia 9 que permitiram...

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Raman spectroscopy of iodine-doped double-walled carbon nanotubes

Cited by 82 publications

References 25 publications

Resonance Raman scattering studies inBr2-adsorbed double-wall carbon nanotubes

Resonance Raman scattering studies inBr2-adsorbed double-wall carbon nanotubes

X-ray diffraction as a tool for the determination of the structure of double-walled carbon nanotube batches

Funcionalização de nanotubos de Carbono

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