Electronic structure of chiral graphene tubules

Saito, Riichiro; Fujita, M.; Dresselhaus, G.; Dresselhaus, M. S.

doi:10.1063/1.107080

Cited by 2,721 publications

(1,733 citation statements)

References 9 publications

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“…[47] This leads to a 1D quantum-confinement structure, where the DOS shows strong dependence on nanotube diameter, chirality, and type (metallic versus semiconducting), as shown in Figure 2. [48][49][50][51] As it will become apparent later on in the discussion, the influence of nanotube type, diameter, and chirality plays an important role in high performance electronic, chemo-, and bio-sensing devices. Figure 1a illustrates the Hamada vector (C h ) with respect to the two graphene lattice unit vectors, a 1 and a 2 , shown at the upper left corner.…”

Section: Carbon Nanotube Propertiesmentioning

confidence: 99%

“…10 meV, i.e., semimetallic for n -m = 3k, where k is an integer), or large bandgap (0.6 eV and above, i.e., semiconducting for n -m ≠ 3k). [49,52] Typically, semimetallic tubes are treated as metallic owing to their minute bandgap in relation to room temperature. According to the chirality map of Figure 1a, one third of SWNTs are metallic (light blue hexagons) and two thirds are semiconducting (white hexagons).…”

Section: Carbon Nanotube Propertiesmentioning

confidence: 99%

“…In 2004, he was elected member of the Connecticut Academy of Science and Engineering. [49] with a transfer integral, γ o = 2.9 eV [50], while the S E 22 and S E 11 values in (e,f) were obtained from experimental photoluminescence excitation data [51]. Schematic representation of biomolecular sensing using carbon nanotubes in various device configuration and signal amplification strategies.…”

Section: Future Outlook and Concluding Remarksmentioning

confidence: 99%

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Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

2007

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The unique electronic and optical properties of carbon nanotubes, in conjunction with their size and mechanically robust nature, make these nanomaterials crucial to the development of next-generation biosensing platforms. In this Review, we present recent innovations in carbon nanotube-assisted biosensing technologies, such as DNA-hybridization, protein-binding, antibody-antigen and aptamers. Following a brief introduction on the diameter-and chirality-derived electronic characteristics of single-walled carbon nanotubes, the discussion is focused on the two major schemes for electronic biodetection, namely biotransistor-and electrochemistry-based sensors. Key fabrication methodologies are contrasted in light of device operation and performance, along with strategies for amplifying the signal while minimizing nonspecific binding. This Review is concluded with a perspective on future optimization based on array integration as well as exercising a better control in nanotube structure and biomolecular integration.

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Section: Carbon Nanotube Propertiesmentioning

confidence: 99%

Section: Carbon Nanotube Propertiesmentioning

confidence: 99%

Section: Future Outlook and Concluding Remarksmentioning

confidence: 99%

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Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

2007

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“…The investigation of SWNTs transport requires us to address two practical issues. Firstly, most SWNTs are obtained as the ensembles of various structural forms, and their electronic types vary from metallic (m-) to semiconducting (s-), depending on chirality [2]. Many applications require separation of SWNTs with a certain electronic type, and considerable progress has been made recently in this area [3–7].…”

Section: Introductionmentioning

confidence: 99%

Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Nonoguchi

Takata

Goto

et al. 2018

Science and Technology of Advanced Materials

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The effects of polymer structures on the thermoelectric properties of polymer-wrapped semiconducting carbon nanotubes have yet to be clarified for elucidating intrinsic transport properties. We systematically investigate thickness dependence of thermoelectric transport in thin films containing networks of conjugated polymer-wrapped semiconducting carbon nanotubes. Well-controlled doping experiments suggest that the doping homogeneity and then in-plane electrical conductivity significantly depend on film thickness and polymer species. This understanding leads to achieving thermoelectric power factors as high as 412 μW m−1 K−2 in thin carbon nanotube films. This work presents a standard platform for investigating the thermoelectric properties of nanotubes.

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“…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 comprovar as principais propriedades físicas dos nanotubos, previstas no início da década de 90 10,11 . Hoje, diversos métodos de preparação de nanotubos de carbono foram desenvolvidos e podem ser produzidos 12 nanotubos isolados sobre substratos, suspensos em pilares e dispostos em arquiteturas complexas.…”

Section: Introductionunclassified

Funcionalização de nanotubos de Carbono

Filho

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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Electronic structure of chiral graphene tubules

Cited by 2,721 publications

References 9 publications

Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Funcionalização de nanotubos de Carbono

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