In the present invention, by dry pulverizing carbon nanotubes to control wettability index of the carbon nanotubes, the maximum concentration of the carbon nanotubes that can be added to the dispersion solvent can be increased and the workability of the carbon nanotube dispersion can be improved. Further, from this, it is possible to more easily predict the maximum concentration of the carbon nanotubes that can be added to the dispersion solvent.

High-performance carbon nanotube (CNT) based millimeter-wave transistor technologies and demonstrate monolithic millimeter-wave integrated circuits (MMICs) based thereon, and methods and processes for the fabrication thereof are also provided. CNT technologies and MMICs demonstrate improved power efficiency, linearity, noise and dynamic range performance over existing GaAs, SiGe and RF-CMOS technologies. Methods and processes in CNT alignment and deposition, material contact and doping are configured to fabricate high quality CNT arrays beyond the current state-of-the-art and produce high performance RF transistors that are scalable to wafer size to enable fabrication of monolithic integrated circuits based on CNTs.

An electromagnetic wave absorbing sheet includes a sheet-shaped fibrous substrate and a plurality of carbon nanotubes attached to the sheet-shaped fibrous substrate. The attached amount of the carbon nanotubes in the electromagnetic wave absorbing sheet is 5 mass % or more. The electromagnetic wave absorbing sheet has a surface resistance of 20 Ω/sq. or more.

A process for manufacturing shaped articles containing carbon nanotubes including the steps of supplying carbon nanotubes in an acidic liquid containing at least one acid, the at least one acid having a Hammett acidity function less than that of 100% sulfuric acid, the at least one acid having a Hammett acidity function equal or more than that of 90% sulfuric acid, and shaping the acidic liquid comprising carbon nanotubes into a shaped article.

A carbon nanotube aligned film as well as a preparation method and application thereof are disclosed. The preparation method includes: providing a carbon nanotube dispersion solution comprising a selected carbon nanotube, a polymer as a carbon nanotube dispersing agent and binding to the selected carbon nanotube, an aromatic molecule binding to the selected carbon nanotube and allowing the surface of the selected carbon nanotube to have the same charges and an organic solvent being at least used for cooperating with the rest components of the dispersion solution to form uniform dispersion solution; and introducing a water phase layer to the upper surface of the dispersion solution to form a double-layer liquid phase system, partially or completely inserting a base into the double-layer liquid system, and then pulling out the base so as to form the carbon nanotube aligned film on the surface of the base.

Methods for forming a nanotube fabric with a controlled surface roughness (or smoothness) and a selected degree of rafting are disclosed by adjusting the concentration levels of a selected ionic species within a nanotube formulation used to form the nanotube fabric. In one aspect, the present disclosure provides a nanotube formulation roughness curve (and methods for generating such a curve) that can be used to select a utilizable range of ionic species concentration levels that will provide a nanotube fabric with a desired surface roughness (or smoothness) and degree of rafting. In some aspects of the present disclosure, such a nanotube formulation roughness curve can be used adjust nanotube formulation prior to a nanotube formulation deposition process to provide nanotube fabrics that are relatively smooth with a low degree of rafting.

A substrate comprises carbon nanotubes, oriented largely parallel in a direction away from the substrate. In a plane along a surface of said substrate carbon nanotubes are formed in first cells of a connected structure of carbon nanotubes. Said first cells formed within a second structure of second cells, the carbon nanotubes are thereby patterned in a structure of first cells, nested in a structure of second cells. The first cells comprise at least one opening, without carbon nano tubes, to provide access to the surface of the substrate. Second cells are separated from each other by a trench to prevent carbon nanotubes of a second cell from contacting carbon nanotubes of another second cell across a first gap formed by said trench. The trench provides access to the substrate.

Provided are a composite material capable of further enhancing property derived from carbon nanotubes adhered to carbon fibers, a prepreg, a carbon-fiber-reinforced molded article, and a method for manufacturing a composite material. There is provided a composite material including: carbon fibers; and a structure which includes a plurality of carbon nanotubes and has a network structure in which the carbon nanotubes are in direct contact with each other, and in which the carbon nanotubes adhered to surfaces of the carbon fibers directly adhere to the surfaces of the carbon fibers. The carbon nanotubes have a bent shape having a bent portion.

In one aspect, the present invention is generally directed to methods for measuring distribution of lengths of a collection of carbon nanotubes. In particular, the present teachings provide an indicator for length-based separation of carbon nanotubes (CNTs) via conjugation of one or more biomolecules onto the surfaces of the nanotubes. As discussed in more detail below, in some embodiments, such a method can include conjugating a biomolecule to the carbon nanotubes and subject the conjugated carbon nanotubes to silver-stained gel electrophoresis to separate the conjugated carbon nanotubes based on their lengths.

A carbon nanotube attached member has a substrate, which is mainly made of aluminum, and a aligned CNT film which is aligned along an alignment direction ORD. A carbon nanotube/CNT, which forms the aligned CNT film, has a length of 200 micrometers or longer. The CNT is synthesized starting from a mixed gas of acetylene, hydrogen, and argon. Furthermore, carbon dioxide is added to maintain catalyst activity. A ratio of acetylene:carbon dioxide is adjusted from 1:10 to 1:300. The aligned CNT film is partially formed. The formation range of the aligned CNT film is set by inhibiting synthesis and/or aligned growth of the CNT by a rough surface or a carbon-containing substance.