Abstract:
Embodiments in accordance with the present disclosure include methods, polymers, and complexes. For example, a method embodiments includes providing a solution including a disassembled supramolecular polymer and a bond disrupting agent, adding an antisolvent to the solution to precipitate the supramolecular polymer, and isolating the precipitated supramolecular polymer from the bond disrupting agent. The isolated supramolecular polymer is configured to selectively disperse single-walled carbon nanotubes (SWNTs) of a particular electrical type from a SWNT mixture including SWNTS of at least two electrical types.
Abstract:
A method of enriching specific species of carbon nanotubes by exposing a composition of carbon nanotubes to an azo compound is provided. The method includes a) mixing the azo compound with a suspension comprising the composition of carbon nanotubes to form a mixture; b) incubating the mixture to react the azo compound with the carbon nanotubes; and c) separating a supernatant and a precipitate formed in the mixture. An electrode and a field-effect transistor comprising a single-walled carbon nanotube species enriched using the method are also provided.
Abstract:
A method for removing impurities from a sample of carbon nanotubes wherein the sample is contacted with an electronic liquid comprising a metal and an amine solvent is described.
Abstract:
According to example embodiments, a method includes dispersing carbon nanotubes in a mixed solution containing a solvent, the carbon nanotubes, and a dispersant, the carbon nanotubes including semiconducting carbon nanotubes, the dispersant comprising a polythiophene derivative including a thiophene ring and a hydrocarbon sidechain linked to the thiophene ring. The hydrocarbon sidechain includes an alkyl group containing a carbon number of 7 or greater. The hydrocarbon sidechain may be regioregularly arranged, and the semiconducting carbon nanotubes are selectively separated from the mixed solution. An electronic device includes semiconducting carbon nanotubes and the foregoing described polythiophene derivative.
Abstract:
A process for metallizing nanomaterial including subjecting nanomaterial in a metallizing solution to microwave radiation; nanomaterial made by such a process; and density gradient separation of such material.
Abstract:
A process for metallizing nanomaterial including subjecting nanomaterial in a metallizing solution to microwave radiation; nanomaterial made by such a process; and density gradient separation of such material.
Abstract:
The present invention relates to a method for separating metal carbon nanotubes with a single layer of graphene (m-SWNT) and semiconductor nanotubes with a single layer of graphene (sc-SWNT) including a step of grafting, in particular by the radical chemical grafting of a diazonium salt by-product on a mixture of m-SWNTs and sc-SWNTs so as to obtain a mixture of grafted m-SWNTs and non-grafted sc-SWNTs, by means of which the grafted m-SWNTs and non-grafted sc-SWNTs are separated due to differential chemical and/or physical properties caused by said grafting. The present invention also relates to a kit for separating m-SWNTs and sc-SWNTs.
Abstract:
A method for dispersing nanotubes, comprising contacting the nanotubes with an electronic liquid comprising a metal and an amine solvent, a solution of dispersed nanotubes, comprising individual nanotubes at a concentration of greater than about 0.01mgml -1 and a solvent and a nanotube crystal comprising a close packed array of nanotubes, wherein the crystal has a thickness of 100 nm or more are described.
Abstract:
In embodiments of the invention, bundles of carbon nanotubes are separated from individual nanotubes via interfacial trapping of bundled carbon nanotube bundles at an emulsion interface between suspension-phase and a solution-phase. The separation method comprises dispersing a mixture of individual and bundled carbon nanotubes in a solution comprising surfactant; adding at least one solvent to the surfactant solution to form a two- phase mixture; agitating the two-phase mixture to form an emulsion interface between the solution-phase and a suspension-phase, where nanotube bundles selectively segregate to the emulsion interface. Single-walled carbon nanotube suspensions exhibit strong fluorescence, which can be used to assess the degree of separation and determine if a repeated extraction of any remaining bundled carbon nanotubes remaining in the suspension-phase is desired. In another embodiment of the invention, separation of carbon nanotubes by type is carried out by interfacial trapping.
Abstract:
Methods for forming freestanding objects primarily comprising aligned carbon nanotubes, as well as the objects made by these methods, are provided. Arrays of generally aligned carbon nanotubes are first synthesized on a substrate then released from the substrate and densified, maintaining the aligned arrangement. These densified arrays can take the form of thin strips which can be joined together, for example by lamination, to form larger objects of arbitrary size. These objects can be further cut or otherwise machined to desired dimensions and shapes. Release from the substrate can be accomplished mechanically, such as by shearing, or chemically, such as by etching. Densification can be accomplished, for example, through compaction or by taking advantage of capillary forces. In the latter case, an array is first wetted with a fluid and then dried. As the fluid is removed, capillary forces draw the nanotubes closer together.