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Direct observation of ultrafast long-range charge separation at polymer–fullerene heterojunctions
Photocarrier generation at organic semiconductor heterojunctions is a crucial process, yet its mechanism and dynamics remain unclear. Here, Provencher et al.show little change in polymer structure following the charge-transfer process and interpret the observation in terms of unbounded electron-hole pairs.
- Françoise Provencher
- , Nicolas Bérubé
- & Sophia C. Hayes
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High-strength carbon nanotube fibre-like ribbon with high ductility and high electrical conductivity
There is strong interest in carbon nanotube assemblies for a variety of applications, many of which require combined high mechanical and electrical properties. Here, the authors demonstrate a rolling technique for performance improvement, reporting tensile strength of 4.34 GPa, ductility of 10% and electrical conductivity of 2.0 × 104 S cm−1.
- J. N. Wang
- , X. G. Luo
- & Y. Chen
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Large-scale complementary macroelectronics using hybrid integration of carbon nanotubes and IGZO thin-film transistors
Carbon nanotubes and metal-oxide semiconductors are widely used in thin-film transistors, but integrating the two technologies is challenging. Here, the authors report a hybrid integration of p-type carbon nanotubes and n-type IGZO transistors, resulting in a large-area complementary circuit.
- Haitian Chen
- , Yu Cao
- & Chongwu Zhou
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Controlling the crystalline three-dimensional order in bulk materials by single-wall carbon nanotubes
The use of templates to achieve ordered material architectures over long length scales is challenging. Here, the authors use single-wall carbon nanotubes as scaffolds to macroscopically control the ordering of n/pthree-dimensional supramolecularly assembled materials.
- Javier López-Andarias
- , Juan Luis López
- & Nazario Martín
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Hybrid carbon nanotube yarn artificial muscle inspired by spider dragline silk
Artificial muscles composed of carbon nanotube yarns have previously demonstrated fast, large-angle rotations. Here, the authors infiltrate carbon nanotube yarns with a paraffin wax and polystyrene-based copolymer mixture, achieving stable 9,800 r.p.m. rotation without apparent oscillation.
- Kyoung-Yong Chun
- , Shi Hyeong Kim
- & Seon Jeong Kim
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A 1.7 nm resolution chemical analysis of carbon nanotubes by tip-enhanced Raman imaging in the ambient
Tip-enhanced Raman spectroscopy allows chemical imaging of materials with high spatial resolution. Here, using plasmonic effects from a gold tip and gold substrate, Chen et al.achieve the chemical imaging of a carbon nanotube down to 1.7 nm resolution at ambient conditions.
- Chi Chen
- , Norihiko Hayazawa
- & Satoshi Kawata
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Enhanced thermal transport at covalently functionalized carbon nanotube array interfaces
Despite their high thermal conductivities, the large thermal interface resistance between carbon nanotubes and other components limits their practical applications. Here, the authors show that covalently bonded bridging molecules can significantly enhance the thermal transport across these interfaces.
- Sumanjeet Kaur
- , Nachiket Raravikar
- & D. Frank Ogletree
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Photoactuators and motors based on carbon nanotubes with selective chirality distributions
Materials that can alter their structure in response to light have potential as functional materials such as motors and actuators. Here the authors describe a low-cost system capable of rapid, reversible and wavelength-selective responses to light.
- Xiaobo Zhang
- , Zhibin Yu
- & Ali Javey
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Development of an ultra-thin film comprised of a graphene membrane and carbon nanotube vein support
Graphene has great potential in various electronic devices, but obtaining large-area suspended graphene is problematic. Here, the authors use carbon nanotubes as supports for graphene, enabling large areas of strong and 90% electron transparent suspended graphene to be realized.
- Xiaoyang Lin
- , Peng Liu
- & Kaili Jiang
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| Open AccessUltrashort single-walled carbon nanotubes in a lipid bilayer as a new nanopore sensor
Nanopore sensors are a promising tool for the controlled detection of a range of possible substrates. Here the authors describe a nanopore sensor based on short single-walled carbon nanotubes inserted into a lipid bilayer, with modified sensing properties compared to longer nanotubes.
- Lei Liu
- , Chun Yang
- & Hai-Chen Wu
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| Open AccessDetermining the optimum morphology in high-performance polymer-fullerene organic photovoltaic cells
The morphology of organic solar cells is crucial to their performance but is difficult to measure. Using a variety of probes, Hedley et al.map the morphology of polymer-fullerene solar cells and find that elongated fibre-like polymer- and fullerene-rich domains are desirable for high performance.
- Gordon J. Hedley
- , Alexander J. Ward
- & Ifor D. W. Samuel
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Symmetry breaking in a mechanical resonator made from a carbon nanotube
Carbon nanotube mechanical resonators are able to bend by a large amount through static strain. Here, the authors study how the bending breaks the symmetry of the restoring potential, and how the potential nonlinearity can lead to an apparent quality factor that is less than 100 at room temperature.
- A. Eichler
- , J. Moser
- & A. Bachtold
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Tip-enhanced nano-Raman analytical imaging of locally induced strain distribution in carbon nanotubes
Tip-enhanced Raman scattering microscopy gives high-resolution information on nanostructures, yet measurements on more intrinsic properties have been elusive. Yano et al. develop a tip-enhanced method to induce strain in carbon nanotubes and image its distribution along the tube length.
- Taka-aki Yano
- , Taro Ichimura
- & Satoshi Kawata
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| Open AccessGrowth of carbon nanotubes via twisted graphene nanoribbons
Carbon nanotubes can be considered as rolled-up small sheets of graphene. Here Lim and colleagues demonstrate this process, by fabricating carbon nanotubes through a thermally induced process of self-intertwining of graphene nanoribbons.
- Hong En Lim
- , Yasumitsu Miyata
- & Hisanori Shinohara
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Direct measurement of the absolute absorption spectrum of individual semiconducting single-wall carbon nanotubes
A detailed knowledge of the properties of carbon nanotubes is required for their utilization in practical devices. Here the measurement of the absorption spectra of individual carbon nanotubes by Blancon et al.provides an important feedback to the modelling of their intrinsic properties.
- Jean-Christophe Blancon
- , Matthieu Paillet
- & Fabrice Vallée
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Diameter-dependent ion transport through the interior of isolated single-walled carbon nanotubes
Calculations suggest that ion transport through nanochannels is significantly modified as the diameter approaches molecular dimensions. Choi et al.introduce a single-nanotube platform to demonstrate this effect and find a maximum ion transport rate at a diameter of approximately 1.6 nm.
- Wonjoon Choi
- , Zachary W. Ulissi
- & Michael S. Strano
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| Open AccessCarbon nanotubes on a spider silk scaffold
The use of spider silk in electronic devices is dependent on its compatibility with electrically conductive materials. Here the authors modify spider silk with carbon nanotubes to produce a strong, flexible and electrically conductive thread.
- Eden Steven
- , Wasan R. Saleh
- & James S. Brooks
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Carbon nanotube membranes with ultrahigh specific adsorption capacity for water desalination and purification
Absorption-based water purification technologies are simple to use but can be hindered by their low salt removal capacity. Here, the authors report ultralong carbon nanotubes modified by plasma treatment, capable of salt adsorption two orders of magnitude higher than state-of-the-art carbon-based systems.
- Hui Ying Yang
- , Zhao Jun Han
- & Rohit Karnik
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| Open AccessMouldable all-carbon integrated circuits
The incorporation of electronic circuits into various plastic products and devices is limited by the brittle nature of silicon wafers. Here, Sun et al.demonstrate flexible and high-performance all-carbon-based transistor circuits that can be thermo-moulded into various shapes.
- Dong-Ming Sun
- , Marina Y. Timmermans
- & Yutaka Ohno
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| Open AccessHelicity-dependent single-walled carbon nanotube alignment on graphite for helical angle and handedness recognition
The alignment of carbon nanotubes on a surface is of importance to deploy them in electronic devices. Here, Chen et al.achieve the orientation of carbon nanotubes according to their helical angle and handedness, thus separating nanotubes of different electronic properties.
- Yabin Chen
- , Ziyong Shen
- & Jin Zhang
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Performance enhancement of fullerene-based solar cells by light processing
Bulk heterojunctions based on semiconducting polymers blended with fullerenes are promising for organic solar cells. Liet al.show that an additional light exposure step during fabrication increases their thermal stability and can lead to enhanced device performance.
- Zhe Li
- , Him Cheng Wong
- & João T. Cabral
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| Open AccessConducting linear chains of sulphur inside carbon nanotubes
Elemental sulphur is an insulator in the bulk phase, although it may become conducting under ultrahigh-pressure conditions. Here, the authors report a one-dimensional conducting form of sulphur formed by encapsulation inside single-walled and double-walled carbon nanotubes.
- Toshihiko Fujimori
- , Aarón Morelos-Gómez
- & Katsumi Kaneko
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Prolonged spontaneous emission and dephasing of localized excitons in air-bridged carbon nanotubes
Understanding the photophysics of excitons in carbon nanotubes is important if they are to be fully exploited in optoelectronic devices. Sarpkaya et al. perform photoluminescence spectroscopy of nanotubes across an airbridge, finding a new narrow linewidth regime of intrinsic exciton behaviour.
- Ibrahim Sarpkaya
- , Zhengyi Zhang
- & Stefan Strauf
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Giant cationic polyelectrolytes generated via electrochemical oxidation of single-walled carbon nanotubes
Reduced carbon nanotube anions can be effectively processed and functionalized. Here, the authors prepare discrete nanotube cations by electrochemical oxidation, and the confirmation of their reactivity towards nucleophiles suggests a new library of covalent nanotube modifications.
- Stephen A. Hodge
- , Mustafa K. Bayazit
- & Milo S. P. Shaffer
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Ultrafast charge and discharge biscrolled yarn supercapacitors for textiles and microdevices
Strong, flexible supercapacitors are desirable for miniaturized electronic devices, but realizing a combination of high energy and power density is challenging. Lee et al. address this with a demonstration of high-performance supercapacitor yarns that could be useful for electronic textiles.
- Jae Ah Lee
- , Min Kyoon Shin
- & Seon Jeong Kim
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| Open AccessActive and stable carbon nanotube/nanoparticle composite electrocatalyst for oxygen reduction
Cheap, efficient oxygen reduction reaction catalysts are vital for the development of fuel cells and lithium-air batteries. Here, the authors report the scalable synthesis of a nitrogen-doped carbon nanotube/nanoparticle hybrid material that outperforms several platinum-based catalysts.
- Hoon T. Chung
- , Jong H. Won
- & Piotr Zelenay
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Optical visualization of individual ultralong carbon nanotubes by chemical vapour deposition of titanium dioxide nanoparticles
The characterization and manipulation of carbon nanotubes is of relevance for a range of nanotechnology applications, but usually requires electron microscopes. Here Zhang et al. evaporate nanoparticles on carbon nanotubes to make them visible even under an optical microscope.
- Rufan Zhang
- , Yingying Zhang
- & Fei Wei
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Large spin-orbit coupling in carbon nanotubes
Large spin-orbit coupling in solids has the potential to yield materials that can display unique properties such as non-trivial topological ordering. Steele et al.report an order of magnitude higher zero-field spin splitting in carbon than has been measured previously.
- G.A. Steele
- , F. Pei
- & L.P. Kouwenhoven
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Quantum-coupled radial-breathing oscillations in double-walled carbon nanotubes
Double-walled carbon nanotubes are a convenient system for studying quantum mechanical interactions in distinct but coupled nanostructures. Liu et al.characterize the coupling between radial-breathing mode oscillations of inner and outer walls of many double-walled nanotubes of different diameter and chirality.
- Kaihui Liu
- , Xiaoping Hong
- & Feng Wang
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Controllable unzipping for intramolecular junctions of graphene nanoribbons and single-walled carbon nanotubes
The formation of junctions between graphene and other materials could aid the development of nanoelectronics. We et al. partially unzip single-walled carbon nanotubes to produce graphene/nanotube junctions that show gate-dependent rectifying behaviour.
- Dacheng Wei
- , Lanfei Xie
- & Andrew Thye Shen Wee
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A seamless three-dimensional carbon nanotube graphene hybrid material
Graphene and single-walled carbon nanotubes have high electrical conductivities and large specific surface areas. Here, these properties are extended into three dimensions by producing a seamless carbon nanotube graphene hybrid material.
- Yu Zhu
- , Lei Li
- & James M. Tour
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| Open AccessCarbon nanotube–liposome supramolecular nanotrains for intelligent molecular-transport systems
There is growing interest in the development of artificial molecular-transport systems. Miyakoet al. develop a supramolecular system consisting of carbon nanotubes and liposomes that allows the directional transport and controlled release of cargo molecules.
- Eijiro Miyako
- , Kenji Kono
- & Yoshihisa Hagihara
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Chirality-controlled synthesis of single-wall carbon nanotubes using vapour-phase epitaxy
The promising electronic properties of single-wall carbon nanotubes are strongly dependent on their chirality. Here a metal catalyst free, vapour-phase epitaxy-type cloning mechanism is shown to yield high purity metallic and semiconducting nanotubes from purified single-chirality seeds.
- Jia Liu
- , Chuan Wang
- & Chongwu Zhou
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Insights into the biomedical effects of carboxylated single-wall carbon nanotubes on telomerase and telomeres
Single-walled carbon nanotubes can selectively stabilize telomeric i-motif DNA and have been suggested as a treatment for cancer. Here, carbon nanotubes are found to inhibit telomerase activity by stabilizing i-motif DNA, leading to telomere uncapping and altered telomere function in cancer cells.
- Yong Chen
- , Konggang Qu
- & Xiaogang Qu
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Closed network growth of fullerenes
The formation mechanisms of fullerenes remain unclear. This study shows that fullerenes self-assemble through a closed network growth mechanism in which atomic carbon and C2are incorporated into the growing closed cages.
- Paul W. Dunk
- , Nathan K. Kaiser
- & Harold W. Kroto
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Three-dimensional imaging of single nanotube molecule endocytosis on plasmonic substrates
Imaging and tracking the motion of single molecules on cell plasma membranes requires high spatial resolution in three dimensions. Honget al. develop a plasmonic ruler based on the fluorescence enhancement of carbon nanotubes on a gold plasmonic substrate, allowing the observation of nanotube endocytosis in three dimensions.
- Guosong Hong
- , Justin Z. Wu
- & Hongjie Dai
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| Open AccessCMOS-based carbon nanotube pass-transistor logic integrated circuits
Field-effect transistors fabricated from carbon nanotubes have been investigated extensively over the past two decades. This study demonstrates a nanotube-based integrated circuit design that substantially improves the speed and power consumption with respect to silicon-based integrated circuits.
- Li Ding
- , Zhiyong Zhang
- & Lian-Mao Peng
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| Open AccessSynergistic toughening of composite fibres by self-alignment of reduced graphene oxide and carbon nanotubes
Composite fibres made of polymers reinforced by carbon nanotubes are known for their exceptional toughness. Shinet al. make these composites even tougher, by self-aligning carbon nanotubes and reduced graphene oxide flakes within the polymer matrix.
- Min Kyoon Shin
- , Bommy Lee
- & Seon Jeong Kim
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Selective dispersion of high purity semiconducting single-walled carbon nanotubes with regioregular poly(3-alkylthiophene)s
Metallic and semiconducting carbon nanotubes generally coexist in 'as-grown' materials. In this study, single-walled nanotubes are sorted using regioregular poly(3-alkylthiophene)s; rational selection of polymers, solvent and temperature allows the selective dispersion of semiconducting carbon nanotubes.
- Hang Woo Lee
- , Yeohoon Yoon
- & Zhenan Bao
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Bottom-up synthesis of finite models of helical (n,m)-single-wall carbon nanotubes
Hoop-shaped aromatic hydrocarbons can be considered as finite models of single-wall carbon nanotubes. Hitosugiet al. describe the bottom-up synthesis of a macrocyclic tetramer of chrysene, and show that its persistent rotational isomers are finite models of chiral nanotubes.
- Shunpei Hitosugi
- , Waka Nakanishi
- & Hiroyuki Isobe
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Highly aligned carbon nanotube forests coated by superconducting NbC
Composites of carbon nanotubes and superconductors provide technologically important new, or improved, functionalities. Here, with a chemical solution approach, well-aligned carbon nanotube forests embedded in a superconducting NbC matrix are shown to effectively enhance the superconducting properties of NbC.
- G.F. Zou
- , H.M. Luo
- & Q.X. Jia
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| Open AccessCarbon arc production of heptagon-containing fullerene[68]
Chemical manipulation of fullerenes has allowed the production of heptagon-containing fullerenes, but they have not been synthesised using bottom-up approaches. Here, a heptagon-containing fullerene[68] is obtained as C68Cl6from a carbon arc plasma.
- Yuan-Zhi Tan
- , Rui-Ting Chen
- & Lan-Sun Zheng
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Direct imaging of Joule heating dynamics and temperature profiling inside a carbon nanotube interconnect
The use of carbon nanotubes in nanoelectronics requires an understanding of their resistive, or Joule, heating at interconnects. Here, Joule heating dynamics are imaged in real time by following the evolution of resistive hot spots with a transmission electron microscope.
- Pedro M.F.J. Costa
- , Ujjal K. Gautam
- & Dmitri Golberg
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Encapsulation of single-molecule magnets in carbon nanotubes
Single-molecule magnets could be useful for the development of spintronic devices. Here single-molecule magnets are encapsulated in carbon nanotubes without affecting the properties of the guest molecules, which may be useful in the development of spintronic or high-density magnetic storage devices.
- Maria del Carmen Giménez-López
- , Fabrizio Moro
- & Andrei N. Khlobystov
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Confined propagation of covalent chemical reactions on single-walled carbon nanotubes
Covalent reactions on carbon nanotube surfaces typically occur at random positions on the hexagonal lattice. Denget al. show that Billups–Birch reductive alkylation takes place at, and propagates from, sp3defect sites, leading to confinement of the reaction fronts in the tubular direction.
- Shunliu Deng
- , Yin Zhang
- & YuHuang Wang
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| Open AccessMediatorless high-power glucose biofuel cells based on compressed carbon nanotube-enzyme electrodes
Glucose biofuel cells can be used to produce clean energy from renewable sources, but their use is limited by poor stability and low power output. In this study, bioelectrodes are fabricated using carbon nanotubes and the resulting biofuel cells have improved stability and power.
- Abdelkader Zebda
- , Chantal Gondran
- & Serge Cosnier
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| Open AccessLarge-scale single-chirality separation of single-wall carbon nanotubes by simple gel chromatography
Large-scale separation of single-wall carbon nanotubes into populations of single chirality is a significant challenge in the practical application of nanotubes. Now, using multicolumn gel chromatography, the large-scale separation of 13 different carbon nanotube species is achieved.
- Huaping Liu
- , Daisuke Nishide
- & Hiromichi Kataura
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Identification of active atomic defects in a monolayered tungsten disulphide nanoribbon
The physical and chemical properties of low-dimensional materials, such as nanoribbons, are affected by edge structures and atomic defects. Here, single-atom defects in a monolayered tungsten disulphide nanoribbon are discriminated and the motions of atomic defects are visualized.
- Zheng Liu
- , Kazu Suenaga
- & Sumio Iijima
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Nanoelectromechanical coupling in fullerene peapods probed by resonant electrical transport experiments
Fullerene peapods are carbon nanotubes encapsulating buckyball molecules. Here the authors show by low-temperature electron transport experiments, that the electronic states of nanotubes couple to the vibrational states of fullerenes, making the peapods a new class of nanoelectromechanical devices.
- Pawel Utko
- , Raffaello Ferone
- & Jesper Nygård