A carbon nanotube assembled wire includes a plurality of carbon nanotubes, wherein in a Raman spectrum of the carbon nanotube assembled wire, a ratio IB/IA of an integrated intensity IA in a range of a Raman shift of 120 cm.sup.−1 or more and 210 cm.sup.−1 or less and an integrated intensity IB in a range of a Raman shift of more than 210 cm.sup.−1 and 280 cm.sup.−1 or less is 0.1 or more.

The present disclosure provides a method for producing elongated non-entangled nanotube filaments using a vertical upward flow floating catalyst chemical vapor deposition system.

The invention discloses a carbon-based composite material and its preparation method and application, which belongs to the technical field of carbon material preparation. The carbon-based composite material comprises the substrate, carbon film and structural carbon which are integrated into one body. The electron, ion and atom transmission and chemical structure characteristics of the carbon-based composite materials are modified by the carbon film and structural carbon containing alkali and/or alkali earth elements resulting in the carbon-based composite materials having excellent physical and chemical properties, which can be used for various applications including battery electrodes, capacitor electrodes, various sensors, solar cell electrodes, electrolytic water hydrogen production electrodes, hydrogen storage materials, catalysts and catalyst carriers, composite materials, reinforcing materials.

A method for carbon nanotube purification, preferably including: providing carbon nanotubes; depositing a mask; and/or selectively removing a portion of the mask; and optionally including removing a subset of the carbon nanotubes and/or removing the remaining mask.

The present invention relates to a method of reproducing at least one single-walled carbon nanotube (3) having predefined electronic properties or a plurality of single-walled carbon nanotube (3) having the same electronic properties. A dispersion (2) is produced for this purpose and carbon nanotubes (3) contained in the dispersion are processed into fragments (6) by energy input. These fragments (6) are applied to and oriented on a carrier (7). The fragments (6) are subsequently extended by chemical vapor deposition and the originally present carbon nanotubes (3) are thus reproduced.

A method for manufacturing a vertically aligned carbon nanotube substrate includes the steps of treating a vertically aligned carbon nanotube array in an untreated state with a plasma to generate a vertically aligned carbon nanotube array in a plasma-treated state and adhering a coating onto at least a portion of the vertically aligned carbon nanotube array in the plasma-treated state to generate a vertically aligned carbon nanotube array in a coated state. The step of treating can include exposing the vertically aligned carbon nanotube substrate in the untreated state to the plasma in a plasma chamber. The step of adhering can include using a process of thermal evaporation or e-beam ablation. The method can also include the step of adhering a plurality of fluorophores to at least a portion of the vertically aligned carbon nanotube array in the coated state.

The present invention provides a method for producing a carbon nanotube sheet that is excellent in light transmittance and conductivity, and the carbon nanotube sheet. The method includes firstly modifying of modifying a free-standing unmodified carbon nanotube sheet in which a plurality of carbon nanotubes are aligned in a predetermined direction. The firstly modifying includes performing a densification process of bringing the unmodified carbon nanotube sheet into contact with either one of or both of vapor and liquid particles of a liquid substance to produce a modified carbon nanotube sheet that contains the carbon nanotubes which are mainly aligned in a predetermined direction, and that includes a high density portion where the carbon nanotubes are assembled together and a low density portion where density of the carbon nanotubes is relatively lower than density in the high density portion.

Techniques are described for transferring nanofiber forests using transfer films that either lack a conventional adhesive at the substrate - nanofiber forest interface or that include a diffusion barrier that prevents diffusion of adhesive molecules (or other polymer molecules mobile at ambient temperatures) into the nanofiber forest. These techniques can be applied to single layer nanofiber forests or stacks of multiple nanofiber forest. By selecting the bond strength between the nanofiber forest and the transfer films, the nanofibers can be aligned in a common direction that includes, but is not limited to, perpendicular to a substrate or transfer film.

A method of forming a carbon nanotube array substrate is disclosed. One embodiment comprises depositing a composite catalyst layer on the substrate, oxidizing the composite catalyst layer, reducing the oxidized composite catalyst layer, and growing the array on the composite catalyst layer. The composite catalyst layer may comprise a group VIII element and a non-catalytic element deposited onto the substrate from an alloy. In another embodiment, the composite catalyst layer comprises alternating layers of iron and a lanthanide, preferably gadolinium or lanthanum. The composite catalyst layer may be reused to grow multiple carbon nanotube arrays without additional processing of the substrate. The method may comprise bulk synthesis by forming carbon nanotubes on a plurality of particulate substrates having a composite catalyst layer comprising the group VIII element and the non-catalytic element. In another embodiment, the composite catalyst layer is deposited on both sides of the substrate.

The present disclosure relates to composite articles comprising non-linear elongated nanostructures and associated systems and methods. In certain embodiments, collections of carbon nanotubes or other elongated nanostructures can be used to provide mechanical reinforcement along multiple directions within a composite article.