News Column

Patent Issued for Method for Making a Carbon Nanotube Film

September 3, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Wang, Ding (Beijing, CN); Liu, Chang-Hong (Beijing, CN); Fan, Shou-Shan (Beijing, CN), filed on December 20, 2007, was published online on August 19, 2014.

The assignee for this patent, patent number 8808589, is Tsinghua University (Beijing, CN).

Reporters obtained the following quote from the background information supplied by the inventors: "The invention relates generally to carbon nanotube films and, particularly, to a method for making a carbon nanotube film.

"Carbon nanotubes (CNTs) produced by means of arc discharge between graphite rods were first discovered and reported in an article by Sumio Iijima, entitled 'Helical Microtubules of Graphitic Carbon' (Nature, Vol. 354, Nov. 7, 1991, pp. 56-58). CNTs are electrically conductive along their length, chemically stable, and capable, individually, of having a very small diameter (much less than 100 nanometers) and large aspect ratios (length/diameter). Due to these and other properties, it has been suggested that CNTs can play an important role in various fields, such as field emission devices, new optic materials, sensors, soft ferromagnetic materials, etc.

"Carbon nanotube film has been found especially useful in field emission electron sources, photoelectric and biological sensors, transparent electrical conductors, battery electrodes, absorbing materials, water purification materials, light emitting material, and related devices. Thus, methods for making the carbon nanotube film have been become the basis for applications in the above-described fields. Currently, carbon nanotube film can be made by a method of direct growth.

"Moreover, the carbon nanotube film can also be made by methods using carbon nanotube powders, such as a dropping and drying solvent method, a Langmuir-blodgett (L-B) method, a printing method, an electrophoresis method, a membrane filter method, etc. However, the above-described methods generally have complicated fabrication procedures. Thus, in use, such methods have proven less efficient than truly desirable. Furthermore, the carbon nanotube films produced by the above-described methods have poor tensile strength and/or toughness. Thus, the carbon nanotube films are susceptible to fracture.

"What is needed, therefore, is a method for making a carbon nanotube film, that is very simple, efficient, and produces a film whose toughness is excellent."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "A method for making a carbon nanotube film includes the steps of: (a) adding a plurality of carbon nanotubes to a solvent to create a carbon nanotube floccule structure in the solvent; (b) separating the carbon nanotube floccule structure from the solvent; and shaping the separated carbon nanotube floccule structure into the carbon nanotube film.

"Other advantages and novel features of the present method for making a carbon nanotube film will become more apparent from the following detailed description of presents embodiments when taken in conjunction with the accompanying drawings."

For more information, see this patent: Wang, Ding; Liu, Chang-Hong; Fan, Shou-Shan. Method for Making a Carbon Nanotube Film. U.S. Patent Number 8808589, filed December 20, 2007, and published online on August 19, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8808589.PN.&OS=PN/8808589RS=PN/8808589

Keywords for this news article include: Fullerenes, Nanotechnology, Carbon Nanotubes, Tsinghua University, Emerging Technologies.

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Source: Journal of Engineering


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