Single-walled carbon nanotubes as excitonic optical wires

Joh, Daniel Y.; Kinder, Jesse M.; Herman, Lihong H.; Ju, Sang Yong; Segal, Michael; Johnson, Jeffreys; Chan, Garnet; Park, Jiwoong

doi:10.1038/nnano.2010.248

Cited by 79 publications

(83 citation statements)

References 36 publications

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“…For the investigated SWNT, they are found to be a few units of quantum conductance G 0 , s S (o) varying in the 4G 0 -9G 0 range for the S 33 and S 44 transitions (see also Table 1). This range is compatible with the results of recent Rayleigh scattering experiments 14 . However, much larger systematic dependence of s S (o) (or of C S ii abs ) on the excitonic transitions, and thus of the associated oscillator strength, is demonstrated by our absorption measurements (Fig.…”

Section: Discussionsupporting

confidence: 92%

“…Such approach has been increasingly developed during the last years, yielding optical imaging of individual CNTs and information on their excitonic resonant energies and linewidths [5][6][7][8][9][10][11][12][13][14][15] . No quantitative determination of the amplitude of the absorption cross-section was obtained, except at specific wavelengths using luminescence, thermal or Rayleigh scattering techniques 9,14,16,17 . The key process of light absorption was however only indirectly addressed, which is probably at the origin of the large dispersion of the indirectly estimated cross-sections found in the literature.…”

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confidence: 99%

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Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

et al. 2013

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The optical properties of single-wall carbon nanotubes are very promising for developing novel opto-electronic components and sensors with applications in many fields. Despite numerous studies performed using photoluminescence or Raman and Rayleigh scattering, knowledge of their optical response is still partial. Here we determine using spatial modulation spectroscopy, over a broad optical spectral range, the spectrum and amplitude of the absorption cross-section of individual semiconducting single-wall carbon nanotubes. These quantitative measurements permit determination of the oscillator strength of the different excitonic resonances and their dependencies on the excitonic transition and type of semiconducting nanotube. A non-resonant background is also identified and its cross-section comparable to the ideal graphene optical absorbance. Furthermore, investigation of the same single-wall nanotube either free standing or lying on a substrate shows large broadening of the excitonic resonances with increase of oscillator strength, as well as stark weakening of polarization-dependent antenna effects, due to nanotube-substrate interaction.

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Section: Discussionsupporting

confidence: 92%

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confidence: 99%

Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

et al. 2013

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“…Currently nanotube research faces two outstanding challenges: (1) achieving chirality-controlled nanotube growth and (2) understanding chirality-dependent nanotube device physics. Addressing these challenges requires, respectively, high-throughput determination of nanotube chirality distribution on growth substrates and in-situ characterization of nanotube electronic structure in operating devices.Direct optical imaging and spectroscopy is well suited for these goals [8][9][10][11][12][13][14] , but its realization for single nanotubes on substrates or in devices has been an outstanding challenge due to small nanotube signal and unavoidable environment background. Here we demonstrate for the first time high-throughput real-time optical imaging and broadband spectroscopy of individual nanotubes in devices using a polarization-based microscopy combined with supercontinuum laser illumination.…”

mentioning

confidence: 99%

“…Direct optical imaging and spectroscopy is well suited for these goals [8][9][10][11][12][13][14] , but its realization for single nanotubes on substrates or in devices has been an outstanding challenge due to small nanotube signal and unavoidable environment background. Here we demonstrate for the first time high-throughput real-time optical imaging and broadband spectroscopy of individual nanotubes in devices using a polarization-based microscopy combined with supercontinuum laser illumination.…”

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confidence: 99%

High-throughput optical imaging and spectroscopy of individual carbon nanotubes in devices

et al. 2013

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* These two authors contribute equally to this work 2 Two paramount challenges in carbon nanotube research are achieving chiralitycontrolled synthesis and understanding chirality-dependent device physics 1-7 . Highthroughput and in-situ chirality and electronic structural characterization of individual carbon nanotubes is crucial for addressing these challenges. Optical imaging and spectroscopy has unparalleled throughput and specificity 8-14 , but its realization for single nanotubes on substrates or in devices has long been an outstanding challenge.Here we demonstrate video-rate imaging and in-situ spectroscopy of individual carbon nanotubes on various substrates and in functional devices using a novel high-contrast polarization-based optical microscopy. Our technique enables the complete chirality profiling of hundreds of as-grown carbon nanotubes. In addition, we in-situ monitor nanotube electronic structure in active field-effect devices, and observe that high-order nanotube optical resonances are dramatically broadened by electrostatic doping. This unexpected behaviour points to strong interband electron-electron scattering processes that can dominate ultrafast dynamics of excited states in carbon nanotubes.3 Single-walled carbon nanotubes (SWNTs) comprise a large family of tubular carbon structures characterized by different chiral indices (n, m), each having distinct electronic structure and physical properties 1 . They are promising materials for next generation nanoelectronic and nano-photonic devices, including field-effect transistors, light emitters and photocurrent/photovoltaics device [1][2][3][4][5][6][7] . Currently nanotube research faces two outstanding challenges: (1) achieving chirality-controlled nanotube growth and (2) understanding chirality-dependent nanotube device physics. Addressing these challenges requires, respectively, high-throughput determination of nanotube chirality distribution on growth substrates and in-situ characterization of nanotube electronic structure in operating devices.Direct optical imaging and spectroscopy is well suited for these goals [8][9][10][11][12][13][14] , but its realization for single nanotubes on substrates or in devices has been an outstanding challenge due to small nanotube signal and unavoidable environment background. Here we demonstrate for the first time high-throughput real-time optical imaging and broadband spectroscopy of individual nanotubes in devices using a polarization-based microscopy combined with supercontinuum laser illumination. Our technique is generally applicable to semiconducting and metallic nanotubes in various configurations, such as on (transparent or opaque) substrates, between contact electrodes, and under top gates. This is in contrast to strong constraints limiting other prevailing single-tube spectroscopy techniques: single-tube fluorescence spectroscopy only works for isolated semiconducting nanotubes 8 ; Rayleigh scattering requires nanotubes suspended or oil-immersed on transparent substrate 9-12 ; and resonant Ra...

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“…With the new advent of nanotechnology, industries are extensively exploiting the methods involved in nanotechnology [1,2]. Constant exposure to the nanoparticles will induce toxic effects.…”

Section: Introductionmentioning

confidence: 99%

Indium Titanium Oxide Nanoparticles Induced Hepatic Damage: Hepatoprotective Role of Novel 2-Imino-4-methyl-1, 2-Dihydropyrimido [5, 4C] Quinoline-5(6H)-one

Bheeman¹,

Cheerothsahajan²,

Sathish³

et al. 2014

Advances in Toxicology

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Protective role of 2-imino-4-methyl-1, 2-dihydropyrimido [5, 4C] quinoline-5(6H)-one (IMDHPQ) in indium titanium oxide nanoparticles (InTiO NPs) induced hepatotoxicity was analyzed. InTiO NPs were synthesized and given orally to albino rats to assess their hepatotoxicity. NPs mediated oxidative stress and liver tissue pathology were analyzed. Altered antioxidants (GSH, GPx, and catalase) and, biochemical (SGOT, SGPT, ALP, total protein, and total bilirubin) and histopathological changes were observed due to the oxidative stress caused by InTiO NPs. Varying effects of IMDHPQ on each parameter were observed in the present study. The altered parameters of InTiO NPs exposed rats might be due to the oxidative stress caused by NPs and hepatoprotective or ameliorative efficacy of quinoline compound IMDHPQ on signaling and molecular mechanism needs further study.

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Single-walled carbon nanotubes as excitonic optical wires

Cited by 79 publications

References 36 publications

Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes

High-throughput optical imaging and spectroscopy of individual carbon nanotubes in devices

Indium Titanium Oxide Nanoparticles Induced Hepatic Damage: Hepatoprotective Role of Novel 2-Imino-4-methyl-1, 2-Dihydropyrimido [5, 4C] Quinoline-5(6H)-one

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