Direct Synthesis of a Macroscale Single‐Walled Carbon Nanotube Non‐Woven Material

Li, Song; Ci, Lijie; Li, LV; Zhou, Zhenping; Yan, Xiaoqin; Liu, Dongfang; Yuan, Huajun; Gao, Yan; Wang, Jianxiong; Liu, Lifeng; Zhao, Xiaowei; Zhang, Zengxing; Dou, Xiaomin; Zhou, Weiya; Wang, Gang; Wang, Chaoyin; Xie, Sishen

doi:10.1002/adma.200306393

Cited by 129 publications

(87 citation statements)

References 34 publications

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“…Since scalable processes for purifying lab-grade quantities of SWCNTs have only recently been formulated, [11][12][13] thin films of exemplary purified materials have just now become readily available for fundamental research, pointing toward a number of promising applications. Thin SWCNT membranes have recently emerged, [16][17][18][19] Commercial transparent conductive coatings like ITO tend to be brittle, and mechanical flexibility is often cited as a desirable characteristic in the next generation of applications. Given the outstanding intrinsic mechanical properties of SWCNTs, one can anticipate the added benefit that films of purified materials might offer in the area of mechanical performance, beyond the usually quoted optical and electronic benchmarks.…”

Section: ' Introductionmentioning

confidence: 99%

Structural Stability of Transparent Conducting Films Assembled from Length Purified Single-Wall Carbon Nanotubes

et al. 2011

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ABSTRACT:Single-wall carbon nanotube (SWCNT) films show significant promise for transparent electronics applications that demand mechanical flexibility, but durability remains an outstanding issue. In this work, thin membranes of length purified single-wall carbon nanotubes (SWCNTs) are uniaxially and isotropically compressed by depositing them on prestrained polymer substrates. Upon release of the strain, the topography, microstructure, and conductivity of the films are characterized using a combination of optical/fluorescence microscopy, light scattering, force microscopy, electron microscopy, and impedance spectroscopy. Above a critical surface mass density, films assembled from nanotubes of well-defined length exhibit a strongly nonlinear mechanical response. The measured strain dependence reveals a dramatic softening that occurs through an alignment of the SWCNTs normal to the direction of prestrain, which at small strains is also apparent as an anisotropic increase in sheet resistance along the same direction. At higher strains, the membrane conductivities increase due to a compression-induced restoration of conductive pathways. Our measurements reveal the fundamental mode of elasto-plastic deformation in these films and suggest how it might be suppressed. ' INTRODUCTIONIn the past two decades, single-wall carbon nanotubes (SWCNTs) have received considerable attention due to their outstanding mechanical, optical, and electronic properties, and a vast amount of research has been devoted to the characterization of these attributes 1 and the potential applications they suggest. 2 Promising applications are rapidly emerging in such areas as high performance composites, 3 thermoelectric materials, 4 and conducting polymer composites.5 Thin SWCNT films, in particular, show exceptional promise for applications that require transparent coatings with superior mechanical, electronic, and optical qualities. [6][7][8][9] The natural tendency for SWCNTs to form flexible, transparent networks with high electrical conductivity at remarkably low surface coverage is a direct consequence of the magnitude of the typical SWCNT aspect ratio, 10 suggesting that nanotube length is a critical factor in dictating the physical properties of such membranes.The electronic and optical properties of SWCNTs are determined by their electronic band structure, 1 which is specified by the chiral vector (n, m) characterizing the symmetry of rolling a two-dimensional graphene sheet into a hollow tube of diameter a. All existing synthetic techniques therefore produce raw material that contains a distribution of electronic types, ranging from semiconducting to metallic, as well as a broad range of lengths, from 10 nm up to hundreds of micrometers. Since scalable processes for purifying lab-grade quantities of SWCNTs have only recently been formulated, 11-13 thin films of exemplary purified materials have just now become readily available for fundamental research, pointing toward a number of promising applications. Thin SWCNT membranes have rece...

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Section: ' Introductionmentioning

confidence: 99%

Structural Stability of Transparent Conducting Films Assembled from Length Purified Single-Wall Carbon Nanotubes

et al. 2011

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“…Many researchers hope that buckypaper can find applications in aerospace, communications, textiles and displays. Buckypaper has been demonstrated to be 500 times stronger than the steel at only one-tenth the weight and is thus expected to contribute to stronger [95][96] and lighter aircraft which would also be immune to lighting strikes. The relative lightness of such an aircraft would not only save on fuel consumption, but would also have reduced pollution output.…”

Section: Cnt Buckypaper 331 Development Of Cnt Buckypapermentioning

confidence: 99%

Laser Patterning of Carbon-Nanotubes Thin Films and Their Applications

Chang-Jian¹,

Ho²

2011

Carbon Nanotubes Applications on Electron Devices

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“…Due to the macroscopic area of SWNT nonwoven, we measured the values of E and failure strength of nonwoven by directly pulling the as-grown and purified nonwoven with a special tensile puller, which is discussed in reference [28]. The special stress-strain puller we used was once employed by Pan et al for measuring the Young's modulus (E) and tensile strength (s b ) of multi-walled carbon nanotubes (MWNT) by pulling very long aligned nanotube ropes [47].…”

Section: Mechanical Measurements Of the Samplesmentioning

confidence: 99%

“…And methane was used as carbon resource in this experiment. After growing for 6-9 h, the products were peeled off as large pieces of nanotube texture from the wall of the quartz tube, which was defined as SWNTs nonwoven [28]. Fig.…”

Section: Morphology Of the As-grown Swnts Nonwovenmentioning

confidence: 99%

“…Our experiments indicated that the growth of DWNTs was strongly dependent on the sulfur addition, and without sulfur only SWNTs were produced. After developed the experimental set-up, tough texture of single-walled carbon nanotubes with area up to several tens square centimeters (called SWNTs nonwoven) was prepared by thermally decomposing methane (CH 4 ) in a developed floating CVD method [28]. It is found that the SWNT nonwoven exhibited extremely high Young's Modulus of ca.…”

Section: Introductionmentioning

confidence: 99%

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Controllable preparation and properties of single-/double-walled carbon nanotubes

Xie

Ci³

et al. 2005

Science and Technology of Advanced Materials

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In this paper, we discussed recent studies done in our laboratories with a floating catalyst chemical vapor deposition (CVD) method. We can grow single-or double-walled carbon nanotubes (SWNTs/DWNTs) with different kinds of catalysts. Single-walled carbon nanotubes without amorphous carbon coating were prepared by thermally decomposing acetylene (C 2 H 2 ) at the temperature range of 750-1200 8C with ferrocene as catalyst. While with sulfur promoted ferrocene catalyst, double-walled carbon nanotubes were mass-produced by pyrolizing C 2 H 2 at the temperature range of 900-1100 8C. Furthermore, tunable growth of DWNTs with different diameter was achieved in our experiment. It is found that DWNTs produced at lower carbon partial pressure have much smaller inner tubes, even DWNTs with the smallest inner diameter of 0.4 nm was found in here. As convenient and effective tool, radial breathing mode (RBM) of Raman scattering technique can be used to distinguish SWNTs from DWNTs. In further studies of Raman scattering with DWNTs, the possible match of the inner tubes and the outer tubes according to the RBM bands was assigned, and different chirality types were discussed according to the diameter and chirality dependence of resonant Raman vibration. We also investigated the temperature-dependent frequency shift of resonant Raman spectra of DWNTs in the range of 78-650 K. We found that different RBM peaks, which are relative to different tube diameters, have different temperature coefficient of frequency shift, and the larger diameter carbon nanotubes have more RBM frequency downshift with increasing temperature. It is ascribed to the RBM frequency variation to the temperature dependence of the stretching force constant of C-C bond. Besides, Polarized Raman spectra were preformed on well-aligned SWNTs structure fabricated through post-growth method and found that the angular dependence of Raman intensity is consistent well with the predictions of the resonance Raman theory. q

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Direct Synthesis of a Macroscale Single‐Walled Carbon Nanotube Non‐Woven Material

Abstract: of silica gel using 20 % CH 2 Cl 2 /hexane as eluant. The best fractions were pooled, evaporated, and recrystallized twice from chloroform/ acetonitrile to yield 12.2 g (23 %) of the title compound as off-white crystals, mp 178±181 C [11].

Cited by 129 publications

References 34 publications

Structural Stability of Transparent Conducting Films Assembled from Length Purified Single-Wall Carbon Nanotubes

Structural Stability of Transparent Conducting Films Assembled from Length Purified Single-Wall Carbon Nanotubes

Laser Patterning of Carbon-Nanotubes Thin Films and Their Applications

Controllable preparation and properties of single-/double-walled carbon nanotubes

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