Abstract: Various examples are provided related to synthesis of single wall carbon nanotubes (SWNTs). In one example, a method includes providing a vapor including a metal catalyst, silicon at a level of about 10 at % of the metal catalyst with balance carbon; synthesizing single wall carbon nanotubes (SWNTs) from the vapor; and collecting the synthesized SWNTs. The vapor including the metal catalyst, silicon and carbon can be provided in a variety of ways. Synthesis of the SWNTs can be an oxygen free synthesis.

Abstract: Various examples are provided related to self-assembled carbon nanotube (CNT) films. In one example, a method includes providing a CNT dispersion solution including an aqueous solution comprising a quantity of amphiphilic pendant polymer dispersant; and a plurality of carbon nanotubes in the aqueous solution, the pendant polymer dispersant enabling CNT self-assembly. The method further includes forming a self-assembled CNT film on a surface of a substrate using the CNT dispersion solution.

Abstract: Various examples are provided related to electrical planarization of carbon nanotube thin films or networks. In one example, a method includes depositing one or more thin protective organic and/or inorganic layer across a nanotube film; disrupting electrical conductance of portions of the nanotube film by exposure of out-of-plane nanotubes to a planarization process that disrupts the electrical conductance through the one or more thin protective organic and/or inorganic layer; and removing the one or more thin protective organic and/or inorganic layer from the nanotube film.

Abstract: Disclosed herein are various layered, carbon-containing materials for use in reducing carbon dioxide. In certain embodiments, the materials comprise single wall carbon nanotubes (SWNTs).

Abstract: Various aspects of tunable barrier transistors that can be used in high power electronics are provided. In one example, among others, a tunable barrier transistor includes an inorganic semiconducting layer; a source electrode including a nano-carbon film disposed on the inorganic semiconducting layer; a gate dielectric layer disposed on the nano-carbon film; and a gate electrode disposed on the gate dielectric layer over at least a portion of the nano-carbon film. The nano-carbon film can form a source-channel interface with the inorganic semiconducting layer. A gate field produced by the gate electrode can modulate a barrier height at the source-channel interface. The gate field may also modulate a barrier width at the source-channel interface.

Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyzer for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.

Abstract: An embodiment of the invention is an air cathode having a porous membrane with at least one hydrophobic surface that contacts a conductive catalytic film that comprises single walled carbon nanotubes (SWNTs) where the nanotubes are in intimate electrical contact. The conductive film can include fullerenes, metals, metal alloys, metal oxides, or electroactive polymers in addition to the SWNTs. In other embodiments of the invention the air cathode is a component of a metal-air battery or a fuel cell.

Abstract: Various examples are provided for brightness compensation in a display. In one example, a method includes identifying an IR voltage drop effect on a pixel supplied by a supply voltage line and generating a brightness signal for the pixel based at least in part on the IR voltage drop effect. In another example, a method includes calculating values of IR voltage drop corresponding to pixels fed by a common supply voltage line and providing a data line signal to each pixel that compensates for the IR voltage drop. In another example, a display device includes a matrix of pixels and a brightness controller configured to determine an IR voltage drop effect on a pixel of the matrix and generate a brightness signal for the pixel based at least in part on the IR voltage drop effect and a temporal average pixel brightness within one refreshing cycle associated with the pixel.

Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.

Abstract: A degradable polymeric nanotube (NT) dispersant comprises a multiplicity of NT associative groups that are connected to a polymer backbone by a linking group where there are cleavable groups within the polymer backbone and/or the linking groups such that on a directed change of conditions, bond breaking of the cleavable groups results in residues from the degradable polymeric NT dispersant in a manner where the associative groups are uncoupled from other associative groups, rendering the associative groups monomelic in nature. The degradable polymeric nanotube (NT) dispersant can be combined with carbon NTs to form a NT dispersion that can be deposited to form a NT film, or other structure, by air brushing, electrostatic spraying, ultrasonic spraying, ink-jet printing, roll-to-roll coating, or dip coating. The deposition can render a NT film that is of a uniform thickness or is patterned with various thicknesses.

Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyzer for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.

Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.

Abstract: A degradable polymeric nanotube (NT) dispersant comprises a multiplicity of NT associative groups that are connected to a polymer backbone by a linking group where there are cleavable groups within the polymer backbone and/or the linking groups such that on a directed change of conditions, bond breaking of the cleavable groups results in residues from the degradable polymeric NT dispersant in a manner where the associative groups are uncoupled from other associative groups, rendering the associative groups monomelic in nature. The degradable polymeric nanotube (NT) dispersant can be combined with carbon NTs to form a NT dispersion that can be deposited to form a NT film, or other structure, by air brushing, electrostatic spraying, ultrasonic spraying, ink-jet printing, roll-to-roll coating, or dip coating. The deposition can render a NT film that is of a uniform thickness or is patterned with various thicknesses.

Abstract: A degradable polymeric nanotube (NT) dispersant comprises a multiplicity of NT associative groups that are connected to a polymer backbone by a linking group where there are cleavable groups within the polymer backbone and/or the linking groups such that on a directed change of conditions, bond breaking of the cleavable groups results in residues from the degradable polymeric NT dispersant in a manner where the associative groups are uncoupled from other associative groups, rendering the associative groups monomelic in nature. The degradable polymeric nanotube (NT) dispersant can be combined with carbon NTs to form a NT dispersion that can be deposited to form a NT film, or other structure, by air brushing, electrostatic spraying, ultrasonic spraying, ink-jet printing, roll-to-roll coating, or dip coating. The deposition can render a NT film that is of a uniform thickness or is patterned with various thicknesses.

Abstract: Various examples are provided for ambipolar vertical field effect transistors (VFETs). In one example, among others, an ambipolar VFET includes a gate layer; a source layer that is electrically percolating and perforated; a dielectric layer; a drain layer; and a semiconducting channel layer. The semiconducting channel layer is in contact with at least a portion of the source layer and at least a portion of the dielectric layer and the source layer and the semiconducting channel layer form a gate voltage tunable charge injection barrier. Another example includes an ambipolar vertical field effect transistor including a dielectric surface treatment layer. The semiconducting channel layer is in contact with at least a portion of the source layer and at least a portion of the dielectric surface treatment layer and where the source layer and the semiconducting channel layer form a gate voltage tunable charge injection barrier.

Abstract: Various aspects of tunable barrier transistors that can be used in high power electronics are provided. In one example, among others, a tunable barrier transistor includes an inorganic semiconducting layer; a source electrode including a nano-carbon film disposed on the inorganic semiconducting layer; a gate dielectric layer disposed on the nano-carbon film; and a gate electrode disposed on the gate dielectric layer over at least a portion of the nano-carbon film. The nano-carbon film can form a source-channel interface with the inorganic semiconducting layer. A gate field produced by the gate electrode can modulate a barrier height at the source-channel interface. The gate field may also modulate a barrier width at the source-channel interface.

Abstract: An electrode comprises an acid treated, cathodically cycled carbon-comprising film or body. The carbon consists of single walled nanotubes (SWNTs), pyrolytic graphite, microcrystalline graphitic, any carbon that consists of more than 99% sp2 hybridized carbons, or any combination thereof. The electrode can be used in an electrochemical device functioning as an electrolyser for evolution of hydrogen or as a fuel cell for oxidation of hydrogen. The electrochemical device can be coupled as a secondary energy generator into a system with a primary energy generator that naturally undergoes generation. fluctuations. During periods of high energy output, the primary source can power the electrochemical device to store energy as hydrogen, which can be consumed to generate electricity as the secondary source during low energy output by the primary source. Solar cells, wind turbines and water turbines can act as the primary energy source.

Abstract: Disclosed herein are various layered, carbon-containing materials for use in reducing carbon dioxide. In certain embodiments, the materials comprise single wall carbon nanotubes (SWNTs).

Abstract: A degradable polymeric nanotube (NT) dispersant comprises a multiplicity of NT associative groups that are connected to a polymer backbone by a linking group where there are cleavable groups within the polymer backbone and/or the linking groups such that on a directed change of conditions, bond breaking of the cleavable groups results in residues from the degradable polymeric NT dispersant in a manner where the associative groups are uncoupled from other associative groups, rendering the associative groups monomelic in nature. The degradable polymeric nanotube (NT) dispersant can be combined with carbon NTs to form a NT dispersion that can be deposited to form a NT film, or other structure, by air brushing, electrostatic spraying, ultrasonic spraying, ink-jet printing, roll-to-roll coating, or dip coating. The deposition can render a NT film that is of a uniform thickness or is patterned with various thicknesses.

Abstract: A degradable polymeric nanotube (NT) dispersant comprises a multiplicity of NT associative groups that are connected to a polymer backbone by a linking group where there are cleavable groups within the polymer backbone and/or the linking groups such that on a directed change of conditions, bond breaking of the cleavable groups results in residues from the degradable polymeric NT dispersant in a manner where the associative groups are uncoupled from other associative groups, rendering the associative groups monomelic in nature. The degradable polymeric nanotube (NT) dispersant can be combined with carbon NTs to form a NT dispersion that can be deposited to form a NT film, or other structure, by air brushing, electrostatic spraying, ultrasonic spraying, ink-jet printing, roll-to-roll coating, or dip coating. The deposition can render a NT film that is of a uniform thickness or is patterned with various thicknesses.