Disclosed is an electromagnetic wave absorbing sheet which comprises a sheet-shaped fibrous substrate and carbon nanotubes positioned in a space inside in a thickness direction of the sheet-shaped fibrous substrate, wherein the fibrous substrate is composed of organic fibers, the carbon nanotubes comprise single-walled carbon nanotubes as a main component, and the electromagnetic wave absorbing sheet has an electrical conductivity of 0.7 S/cm or more and 20 S/cm or less.

Cohesive carbon assemblies are prepared by obtaining a functionalized carbon starting material in the form of powder, particles, flakes, loose agglomerates, aqueous wet cake, or aqueous slurry, dispersing the carbon in water by mechanical agitation and/or refluxing, and substantially removing the water, typically by evaporation, whereby the cohesive assembly of carbon is formed. The method is suitable for preparing free-standing, monolithic assemblies of carbon nanotubes in the form of films, wafers, discs, fiber, or wire, having high carbon packing density and low electrical resistivity. The method is also suitable for preparing substrates coated with an adherent cohesive carbon assembly. The assemblies have various potential applications, such as electrodes or current collectors in electrochemical capacitors, fuel cells, and batteries, or as transparent conductors, conductive inks, pastes, and coatings.

An aerogel fabricated by forming an aqueous suspension including carbon nanotubes and a surfactant, agitating the aqueous suspension, and centrifuging the agitated suspension to form a supernatant including the carbon nanotubes. The supernatant is concentrated to form a concentrated suspension including the carbon nanotubes, and a hydrogel is formed from the concentrated suspension. The hydrogen is contacted with a strong acid to form an acidic hydrogel and to remove surfactant from the hydrogel, and then neutralized. An aerogel is formed from the hydrogel. The aerogel may consist essentially of carbon nanotubes. A composite may be formed from the hydrogel or the aerogel by infiltrating the hydrogel or the aerogel with a polymeric material and curing or pyrolyzing the polymeric material. The composite may be electrically conductive, transparent, flexible, superelastic, or any combination thereof. A device, such as a flexible conductor, sensor, or electrode may include the aerogel or the composite.

High density films of semiconducting single-walled carbon nanotubes having a high degree of nanotube alignment are provided. Also provided are methods of making the films and field effect transistors (FETs) that incorporate the films as conducting channel materials. The single-walled carbon nanotubes are deposited from a thin layer of organic solvent containing solubilized single-walled carbon nanotubes that is spread over the surface of an aqueous medium, inducing evaporative self-assembly upon contacting a solid substrate.

Embodiments of the present disclosure are directed to carbon-containing composites which are suitable for use as electrodes in electrochemical systems. The composites are formed from a scaffold of graphene and carbon nanotubes. Graphene flakes form a plurality of generally planar sheets (e.g., extending in an x-y plane) separated in the direction of a composite axis (e.g., along a z-axis) and approximately parallel to one another. The carbon nanotubes extend between the graphene sheets and at least a portion of the carbon nanotubes are aligned in approximately the same direction, at a defined angle with respect to the composite axis. At least a portion of the scaffold is embedded within a porous carbon matrix (e.g., an activated carbon, a polymer derived graphitic carbon, etc.).

The object of the present invention is to provide a separation method and a separation apparatus for carbon nanotubes capable of separating a mixture of carbon nanotubes in a highly efficient, inexpensive and simple manner. The present invention relates to a carbon nanotube separation method comprising: a step of preparing a dispersion liquid including a mixture of two or more types of carbon nanotubes having different zeta potentials; a step of introducing the dispersion liquid into a flow path formed between a first electrode having holes for allowing the dispersion liquid to pass therethrough, and a second electrode arranged so as to face the first electrode; a step of applying a DC voltage to the first electrode and the second electrode while the dispersion liquid is flowing through the flow path; and, a step of continuously collecting a dispersion liquid including carbon nanotubes separated to a first electrode side upon application of the voltage from an opposite side to the flow path with respect to the first electrode, and at the same time, continuously collecting a dispersion liquid including carbon nanotubes separated to a second electrode side from a downstream side of the flow path.

An electromagnetic wave absorption material comprises: fibrous carbon nanostructures; and an insulating material, wherein a content C of the fibrous carbon nanostructures when a content of the insulating material is 100 parts by mass is 5 parts by mass or more and 15 parts by mass or less, or, in the case where the fibrous carbon nanostructures are fibrous carbon nanostructures that exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm, the content C is 0.3 parts by mass or more and 0.8 parts by mass or less, and the electromagnetic wave absorption material absorbs an electromagnetic wave in a frequency domain of more than 20 GHz.

A method for manufacturing a carbon nanotube needle is provided. A carbon nanotube film comprising of a plurality of commonly aligned carbon nanotubes, a first electrode, and a second electrode are provided. The carbon nanotube film is fixed to the first electrode and the second electrode. An organic solvent is applied to treat the carbon nanotube film to form at least one carbon nanotube string. A voltage is applied to the carbon nanotube string until the carbon nanotube string snaps.

The present invention provides: a film that comprises single-layer carbon nanotubes having shapes which enable the characteristics thereof to be sufficiently exhibited; and a process for producing the film. The film, which comprises single-layer carbon nanotubes, has portions where single-layer carbon nanotubes are densely present and portions where single-layer carbon nanotubes are sparsely present, the dense portions forming a pseudo-honeycomb structure in a surface of the film.

A sensor can include a conductive region in electrical communication with at least two electrodes, the conductive region can include a composite of a polymer and SWCNTs immobilized onto a substrate. In certain embodiment, a linker can be grafted on the substrate. The linker can connect the substrate and the composite of the polymer and SWCNTs. In certain embodiments, the linker can covalently bond the polymer to the substrate. In certain embodiments, metal nanoparticles or ions can be incorporated as a metal sensitizer to confer further selectivity or sensitivity to the device. In certain embodiments, the polymer can act as a ligand for a variety of metal ions. By incorporating a specific metal ion, the sensor can selectively detect a specific analyte. In certain embodiments, the composite of the polymer and SWCNTs can be functionalized. In certain embodiments, the composite can further include a sensing element.