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Saito S, Yamanaka M, Sakakibara Y, Omoda E, Kataura H, Nishizawa N. All-polarization-maintaining Er-doped dual comb fiber laser using single-wall carbon nanotubes. Opt Express 2019; 27:17868-17875. [PMID: 31252739 DOI: 10.1364/oe.27.017868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 05/27/2019] [Indexed: 06/09/2023]
Abstract
We demonstrated a bi-directional, Er-doped dual comb fiber laser consisting of all-polarization-maintaining fiber devices. Polyimide films in which single-wall carbon nanotubes (SWNTs) were dispersed were used as the in-line saturable absorber. In order to avoid synchronization of the two combs and associated damage to the SWNT film, a two-branch configuration with two SWNT films was employed. Soliton pulses with almost the same optical spectra were generated stably in each direction, and dual comb beats were observed simply by overlapping the two outputs. The repetition frequency was 28 MHz, and the frequency difference was 105-140 Hz. Thanks to the small frequency difference, dual comb beats corresponding to the whole optical spectrum were observed without any overlapping. Fourier transform spectroscopy using the developed dual comb source was examined, and the characteristics of an optical filter were successfully obtained.
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Hirano A, Kameda T, Sakuraba S, Wada M, Tanaka T, Kataura H. Disulfide bond formation of thiols by using carbon nanotubes. Nanoscale 2017; 9:5389-5393. [PMID: 28422249 DOI: 10.1039/c7nr01001j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Clarification of the interactions between carbon nanotubes (CNTs) and proteinogenic amino acids is a key approach to understanding CNT-protein interactions. Previous studies have addressed the mechanism of the physical adsorption of amino acids onto CNTs. However, little is known about their chemical reactions in aqueous solutions. Here, we established dispersant-free systems to clarify intrinsic CNT-thiol interactions. We demonstrated that the redox reaction of CNTs with cysteine, containing a thiol group, leads to disulfide bond formation between cysteine molecules, even under acidic conditions. The generality of the redox reaction is validated using other thiols such as dithiothreitol and glutathione. The present results suggest that structures of proteins and peptides containing free thiol groups are chemically modified and misfolded on CNT surfaces by this disulfide bond formation in biological systems.
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Affiliation(s)
- A Hirano
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
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Kawagoe H, Ishida S, Aramaki M, Sakakibara Y, Omoda E, Kataura H, Nishizawa N. Development of a high power supercontinuum source in the 1.7 μm wavelength region for highly penetrative ultrahigh-resolution optical coherence tomography. Biomed Opt Express 2014; 5:932-43. [PMID: 24688825 PMCID: PMC3959847 DOI: 10.1364/boe.5.000932] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 02/15/2014] [Accepted: 02/18/2014] [Indexed: 05/19/2023]
Abstract
We developed a high power supercontinuum source at a center wavelength of 1.7 μm to demonstrate highly penetrative ultrahigh-resolution optical coherence tomography (UHR-OCT). A single-wall carbon nanotube dispersed in polyimide film was used as a transparent saturable absorber in the cavity configuration and a high-repetition-rate ultrashort-pulse fiber laser was realized. The developed SC source had an output power of 60 mW, a bandwidth of 242 nm full-width at half maximum, and a repetition rate of 110 MHz. The average power and repetition rate were approximately twice as large as those of our previous SC source [20]. Using the developed SC source, UHR-OCT imaging was demonstrated. A sensitivity of 105 dB and an axial resolution of 3.2 μm in biological tissue were achieved. We compared the UHR-OCT images of some biological tissue samples measured with the developed SC source, the previous one, and one operating in the 1.3 μm wavelength region. We confirmed that the developed SC source had improved sensitivity and penetration depth for low-water-absorption samples.
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Affiliation(s)
- H. Kawagoe
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - S. Ishida
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - M. Aramaki
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Y. Sakakibara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- JST, CREST, Kawaguchi, Saitama 330-0012, Japan
| | - E. Omoda
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - H. Kataura
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
- JST, CREST, Kawaguchi, Saitama 330-0012, Japan
| | - N. Nishizawa
- Dept. Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Nozaki Y, Nishizawa N, Omoda E, Kataura H, Sakakibara Y. Power scaling of dispersion-managed Er-doped ultrashort pulse fiber laser with single wall carbon nanotubes. Opt Lett 2012; 37:5079-5081. [PMID: 23258011 DOI: 10.1364/ol.37.005079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A high-power, passively mode-locked, Er-doped fiber laser with a single wall carbon nanotube polyimide film was demonstrated in dispersion-managed dissipative-soliton mode-locking operation. The average maximum power of 285 mW and a pulse energy of 8.1 nJ are the highest values yet achieved for single-pulse operation in a nanotube fiber laser. A high-power ultrashort pulse of 680 fs was generated by dispersion compensation at a repetition rate of 34.9 MHz. Passive mode-locking was numerically analyzed, and the dynamics and output properties are discussed.
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Affiliation(s)
- Y Nozaki
- Department of Electrical Engineering and Computer Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Nishizawa N, Nozaki Y, Itoga E, Kataura H, Sakakibara Y. Dispersion-managed, high-power, Er-doped ultrashort-pulse fiber laser using carbon-nanotube polyimide film. Opt Express 2011; 19:21874-21879. [PMID: 22109039 DOI: 10.1364/oe.19.021874] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigated a dispersion-managed, passively mode-locked, ultrashort-pulse, Er-doped fiber laser using a polyimide film containing dispersed single-wall carbon nanotubes (SWNTs) and examined the dependence on net cavity dispersion and output coupling ratio using normal-dispersion fibers and a variable output coupler. For the dissipative soliton mode-locking condition, we achieved a pulse energy of 3.5 nJ and an average power of 114 mW, the highest values yet reported for an SWNT fiber laser under single-pulse operation.
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Affiliation(s)
- N Nishizawa
- Dept. of Electrical Engineering and Computer Science, Nagoya University, Nagoya 464-8603, Japan.
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Abstract
ABSTRACTMulti-walled carbon nanotubes synthesized by the carbon arc in hydrogen gas have very thin core channels. We have measured resonance Raman scattering of some samples synthesized in different conditions, and have observed radial breathing mode (RBM) peaks from 200 to 500 cm−1. Resonance effect of each peak is similar to that of single-walled nanotube. However, the peak frequencies are about 5 % higher than those of single-walled nanotubes, which is probably due to the inter-layer interaction. Further, the highest RBM peak splits in three peaks. The result on the resonance effect and the zone-folding band calculation suggest that the thinnest core nanotube is (4,3) that have four candidates of second outer nanotubes. This suggests that the different outer nanotube gives different degree of the interlayer interaction.
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Senoo Y, Nishizawa N, Sakakibara Y, Sumimura K, Itoga E, Kataura H, Itoh K. Ultralow-repetition-rate, high-energy, polarization-maintaining, Er-doped, ultrashort-pulse fiber laser using single-wall-carbon-nanotube saturable absorber. Opt Express 2010; 18:20673-20680. [PMID: 20940963 DOI: 10.1364/oe.18.020673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
An ultralow-repetition-rate, all-polarization-maintaining (PM), Er-doped, ultrashort-pulse fiber laser was demonstrated using a single-wall-carbon-nanotube polyimide film. Using a ring cavity configuration, output pulses with pulse energy of 0.7-2.6 nJ were obtained at an ultralow repetition rate of 943-154 kHz for a fiber length of 0.1-1.3 km. A novel θ (theta) cavity configuration was proposed, which enabled us to reduce the required fiber length by half. A repetition rate of 132 kHz was achieved using this configuration with 909 m of PM fiber.
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Affiliation(s)
- Y Senoo
- Division of Advanced Science and Biotechnology, Osaka University, Suita, Osaka 565-0871, Japan
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Senoo Y, Nishizawa N, Sakakibara Y, Sumimura K, Itoga E, Kataura H, Itoh K. Polarization-maintaining, high-energy, wavelength-tunable, Er-doped ultrashort pulse fiber laser using carbon-nanotube polyimide film. Opt Express 2009; 17:20233-41. [PMID: 19997248 DOI: 10.1364/oe.17.020233] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A high-energy, wavelength-tunable, all-polarization-maintaining Er-doped ultrashort fiber laser was demonstrated using a polyimide film dispersed with single-wall carbon nanotubes. A variable output coupler and wavelength filter were used in the cavity configuration, and high-power operation was demonstrated. The maximum average power was 12.6 mW and pulse energy was 585 pJ for stable single-pulse operation with an output coupling ratio as high as 98.3%. Wide wavelength-tunable operation at 1532-1562 nm was also demonstrated by controlling the wavelength filter. The RF amplitude noise characteristics were examined in terms of their dependence on output coupling ratio and oscillation wavelength.
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Affiliation(s)
- Y Senoo
- Division of Advanced Science and Biotechnology, Osaka University, Suita, Osaka 565-0871, Japan
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Shiozawa H, Pichler T, Kramberger C, Rümmeli M, Batchelor D, Liu Z, Suenaga K, Kataura H, Silva SRP. Screening the missing electron: nanochemistry in action. Phys Rev Lett 2009; 102:046804. [PMID: 19257457 DOI: 10.1103/physrevlett.102.046804] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2008] [Indexed: 05/06/2023]
Abstract
The excitement of nano-test-tube chemistry in a single-walled carbon nanotube is exemplified in our study on electron doping in carbon nanotubes. Electron doping through the 1D van Hove singularity of single-walled carbon nanotubes is realized via a chemical reaction of an encapsulated organocerium compound, CeCp3. The decomposition of CeCp3 inside the carbon nanotubes increases the doping level and greatly enhances the density of conduction electrons. The transition of the cerium encapsulating semiconducting tubes to metallic results in enhanced screening of the photoexcited core hole potential. This fact illustrates the importance of many body effects in understanding core-level excitation process in carbon nanotubes.
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Affiliation(s)
- H Shiozawa
- Advanced Technology Institute, University of Surrey, Guildford, GU2 7XH, UK
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Rols S, Cambedouzou J, Chorro M, Schober H, Agafonov V, Launois P, Davydov V, Rakhmanina AV, Kataura H, Sauvajol JL. How confinement affects the dynamics of c60 in carbon nanopeapods. Phys Rev Lett 2008; 101:065507. [PMID: 18764476 DOI: 10.1103/physrevlett.101.065507] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2007] [Revised: 06/01/2008] [Indexed: 05/26/2023]
Abstract
The dynamics of confined systems is of major concern for both fundamental physics and applications. In this Letter, the dynamics of C60 fullerene molecules inside single walled carbon nanotubes is studied using inelastic neutron scattering. We identify the C60 vibrations and highlight their sensitivity to temperature. Moreover, a clear signature of rotational diffusion of the C60 is evidenced, which persists at lower temperature than in 3D bulk C60. It is discussed in terms of confinement and of reduced dimensionality of the C60 chain.
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Affiliation(s)
- S Rols
- Institut Laue Langevin, F-38042 Grenoble, France
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Nishizawa N, Seno Y, Sumimura K, Sakakibara Y, Itoga E, Kataura H, Itoh K. All-polarization-maintaining Er-doped ultrashort-pulse fiber laser using carbon nanotube saturable absorber. Opt Express 2008; 16:9429-35. [PMID: 18575508 DOI: 10.1364/oe.16.009429] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We present an all-polarization-maintaining Er-doped ultrashort-pulse fiber laser using a single-wall carbon nanotube polyimide nanocomposite saturable absorber. The maximum average power for single-pulse operation is 4.8 mW, and the repetition frequency is 41.3 MHz. Self-start and stable mode-locking operation is achieved. The RF amplitude noise is also examined and it is confirmed that the noise figure is as low as that of a solid-state laser. Using a polarization-maintaining anomalous dispersive fiber, a 314 fs output pulse is compressed to 107 fs via higher-order soliton compression. The peak power of the compressed pulse is up to 1.1 kW.
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Affiliation(s)
- N Nishizawa
- Division of Advanced Science and Biotechnology, Osaka University, Suita, Osaka 565-0871, Japan.
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Kawasaki S, Hara T, Yokomae T, Okino F, Touhara H, Kataura H, Watanuki T, Ohishi Y. Pressure-polymerization of C60 molecules in a carbon nanotube. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2005.10.137] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hassanien A, Leintschnig G, Mrzel A, Tokumoto M, Kataura H. Electronic and mechanical properties of MoS2-Ix nanotubes and Mo6SxIy nanowires. SURF INTERFACE ANAL 2006. [DOI: 10.1002/sia.2401] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Schibli T, Minoshima K, Kataura H, Itoga E, Minami N, Kazaoui S, Miyashita K, Tokumoto M, Sakakibara Y. Ultrashort pulse-generation by saturable absorber mirrors based on polymer-embedded carbon nanotubes. Opt Express 2005; 13:8025-8031. [PMID: 19498832 DOI: 10.1364/opex.13.008025] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We demonstrate passive mode locking of solid-state lasers by saturable absorbers based on carbon nanotubes (CNT). These novel absorbers are fabricated by spin-coating a polymer doped with CNTs onto commercial dielectric laser-mirrors. We obtain broadband artificial saturable absorber mirrors with ultrafast recovery times without the use of epitaxial growth techniques and the well-established spin-coating process allows the fabrication of devices based on a large variety of substrate materials. First results on passive mode locking of Nd:glass and Er/Yb:glass lasers are discussed. In the case of Er/Yb:glass we report the to our knowledge shortest pulse generated in a self-starting configuration based on Er/Yb:bulk-glass: 68 fs (45 fs Fourier-limit) at 1570 nm wavelength at a pulse-repetition rate of 85 MHz.
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Saito Y, Hayazawa N, Kataura H, Murakami T, Tsukagoshi K, Inouye Y, Kawata S. Polarization measurements in tip-enhanced Raman spectroscopy applied to single-walled carbon nanotubes. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.05.003] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kukovecz A, Smolik M, Bokova S, Kataura H, Achiba Y, Kuzmany H. Determination of the diameter distribution of single-wall carbon nanotubes from the Raman G-band using an artificial neural network. J Nanosci Nanotechnol 2005; 5:204-8. [PMID: 15853138 DOI: 10.1166/jnn.2005.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A novel, artificial neural network-based method is now available for obtaining the mean diameter of single wall carbon nanotube (SWCNT) samples from the diameter dispersive features of their Raman G-band. The method is demonstrated here for six different diameter SWCNT samples and 14 different excitation wavelengths. With an adequately large pool of standard nanotube samples, the suggested method is a useful complementary technique for SWCNT diameter analysis as it is capable of rapid diameter evaluation without prior knowledge of the relevant phonon dispersion relations.
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Affiliation(s)
- A Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1, H-6720 Szeged, Hungary
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Rauf H, Pichler T, Knupfer M, Fink J, Kataura H. Transition from a Tomonaga-Luttinger liquid to a fermi liquid in potassium-intercalated bundles of single-wall carbon nanotubes. Phys Rev Lett 2004; 93:096805. [PMID: 15447126 DOI: 10.1103/physrevlett.93.096805] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2004] [Indexed: 05/06/2023]
Abstract
We report on the first direct observation of a transition from a Tomonaga-Luttinger liquid to a Fermi-liquid behavior in potassium-intercalated mats of single-wall carbon nanotubes. Using high resolution photoemission spectroscopy, an analysis of the spectral shape near the Fermi level reveals a Tomonaga-Luttinger liquid power law scaling in the density of states for the pristine sample and for low dopant concentration. As soon as the doping is high enough to achieve a filling of the conduction bands of the semiconducting tubes, a distinct transition to metallic single-wall carbon nanotube bundles with the scaling behavior of a normal Fermi liquid occurs.
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Affiliation(s)
- H Rauf
- Leibniz-Institut für Festkörper- und Werkstoffforschung, D-01069 Dresden, Germany
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Nishide D, Kataura H, Suzuki S, Okubo S, Achiba Y. Growth of single-wall carbon nanotubes from ethanol vapor on cobalt particles produced by pulsed laser vaporization. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.04.119] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kawasaki S, Komatsu K, Okino F, Touhara H, Kataura H. Fluorination of open- and closed-end single-walled carbon nanotubes. Phys Chem Chem Phys 2004. [DOI: 10.1039/b317011j] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kukovecz A, Smolik M, Bokova S, Kataura H, Achiba Y, Kuzmany H. Diameter dependence of the fine structure of the Raman G-band of single wall carbon nanotubes revealed by a Kohonen self-organizing map. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.10.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pfeiffer R, Kuzmany H, Kramberger C, Schaman C, Pichler T, Kataura H, Achiba Y, Kürti J, Zólyomi V. Unusual high degree of unperturbed environment in the interior of single-wall carbon nanotubes. Phys Rev Lett 2003; 90:225501. [PMID: 12857318 DOI: 10.1103/physrevlett.90.225501] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2002] [Indexed: 05/23/2023]
Abstract
Double wall carbon nanotubes were prepared by vacuum annealing of single wall carbon nanotubes filled with C60. Strong evidence is provided for a highly defect free and unperturbed environment in the interior of the tubes. This is concluded from unusual narrow Raman lines for the radial breathing mode of the inner tubes. Lorentzian linewidths scale down to 0.35 cm(-1) which is almost 10 times smaller than linewidths reported so far for this mode. A splitting is observed for the majority of the Raman lines. It is considered to originate from tube-tube interaction between one inner tube and several different outer tubes. The highest RBM frequency detected is 484 cm(-1) corresponding to a tube diameter of only 0.50 nm. Labeling of the Raman lines with the folding vector is provided for all inner tubes. This labeling is supported by density functional calculations.
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Affiliation(s)
- R Pfeiffer
- Universität Wien, Institut für Materialphysik, Strudlhofgasse 4, A-1090 Wien, Austria
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Nishide D, Kataura H, Suzuki S, Tsukagoshi K, Aoyagi Y, Achiba Y. High-yield production of single-wall carbon nanotubes in nitrogen gas. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00352-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Pichler T, Kuzmany H, Kataura H, Achiba Y. Metallic polymers of C(60) inside single-walled carbon nanotubes. Phys Rev Lett 2001; 87:267401. [PMID: 11800854 DOI: 10.1103/physrevlett.87.267401] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2001] [Indexed: 05/20/2023]
Abstract
Doping induced polymerization of C(60) inside single-walled carbon nanotubes is reported using Raman spectroscopy and resistivity measurements as a probe. The resistivity changes from semiconducting for the undoped system to metallic for the doped system. For full intercalation, we observe a chemical reaction inside the nanotubes which leads to a one-dimensional polymeric C(60)(-6) chain which has metallic character. The resonance and the oscillations of the radial breathing mode are lost suggesting an up-shift of the Fermi level to beyond the third Van Hove singularity in the semiconducting tubes. The linewidth of the radial breathing mode now represents directly the Gaussian distribution of tube diameters.
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Affiliation(s)
- T Pichler
- Universität Wien, Institut für Materialphysik, Strudlhofgasse 4, A-1090 Wien, Austria and Institut für Festkörper- und Werkstofforschung, P.O. Box 270016, D-1171 Dresden, Germany
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Sen R, Ohtsuka Y, Ishigaki T, Kasuya D, Suzuki S, Kataura H, Achiba Y. Time period for the growth of single-wall carbon nanotubes in the laser ablation process: evidence from gas dynamic studies and time resolved imaging. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01320-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Onari S, Inokuma T, Kataura H, Arai T. Absorption edge of the amorphous (GeS2)x(As2S3)1-x system under hydrostatic pressure. Phys Rev B Condens Matter 1987; 35:4373-4379. [PMID: 9941989 DOI: 10.1103/physrevb.35.4373] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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