News Column

Patent Issued for Carbon Nanotube Compositions and Methods of Making and Using Same

August 27, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Leeds, Jarrett (College Park, MD); Wang, YuHuang (Laurel, MD); Fourkas, John T. (Bethesda, MD), filed on May 21, 2013, was published online on August 12, 2014.

The patent's assignee for patent number 8803094 is University of Maryland, College Park (College Park, MD).

News editors obtained the following quote from the background information supplied by the inventors: "Single-walled carbon nanotubes (SWCNTs) have remarkable electrical and optical properties, particularly when they are individually dispersed. However, high concentrations of individually dispersed nanotubes have been difficult to attain, which has hampered the adoption of solution-based technologies such as self-assembly, thin-film coating, fiber spinning, and printing. In addition to individually dispersed solutions, recent work in thin-film transistor devices has underscored the need for producing bulk quantities of nanotubes that can remain individually dispersed after drying and/or curing.

"One of the interesting properties of SWCNTs is the optical absorption and emission features that are associated with the electronic transitions between van Hove singularities (kinks) in the density of states. These optical properties make it possible to take advantage of the unique near-infrared (NIR) fluorescence of SWCNTs as a spectral signature in applications such as document security. Tuning of the band-gap fluorescence by the surrounding environment or through chemical doping methods also enables nanotube applications such as bio-optical sensors. However, these sharp optical absorption features appear only when the nanotubes are well dispersed. Due to coupling of electronic states, fluorescence is often completely quenched when nanotubes are bundled, especially when metallic nanotubes are present. Thus, there is a need for improved nanotube compositions and methods of using them, which is addressed by the present disclosure."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "In an aspect the disclosure provides a composition suitable for printing comprising a plurality of carbon nanotubes in an aqueous medium, said medium comprising a polyol and a surfactant. The concentration of the nanotubes in the composition is at least 3.6 .mu.g/L and at least 20% of the nanotubes are individually dispersed.

"In an aspect the disclosure provides a substrate having a print on at least a portion thereof, where the print is made from a composition of the present disclosure.

"In an aspect, the present disclosure provides a method for detecting the presence of a plurality of single-walled carbon nanotubes deposited on a substrate from a composition comprising a plurality of the single-walled carbon nanotubes in a aqueous medium, said medium comprising a polyol and a surfactant. The concentration of the nanotubes in the composition is at least 3.6 .mu.g/L mg/L and at least 20% of the nanotubes are individually dispersed comprising the steps of: a) obtaining a near-infrared spectrum of a sample ink; b) determining if the sample ink has one or more preselected peaks in the near-infrared spectrum; and c) identifying the ink as the single-walled carbon nanotube composition if the sample has one or more preselected peaks in the near-infrared spectrum."

For additional information on this patent, see: Leeds, Jarrett; Wang, YuHuang; Fourkas, John T.. Carbon Nanotube Compositions and Methods of Making and Using Same. U.S. Patent Number 8803094, filed May 21, 2013, and published online on August 12, 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=8803094.PN.&OS=PN/8803094RS=PN/8803094

Keywords for this news article include: Fullerenes, Nanotechnology, Emerging Technologies, Single Walled Carbon Nanotubes, University of Maryland College Park.

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Source: Journal of Engineering


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