151 results about "Carbon nanotube electrode" patented technology

A touch screen substrate assembly includes a substrate having a surface at least partially coated with an electrically conductive material to provide an electrically conductive touch area on the surface. At least one electrode is disposed over the substrate adjacent the touch area. The electrode is positioned over the substrate to extend continuously along at least a portion of a perimeter portion of the touch area. The electrode includes carbon nanotubes.

Disclosed is a transparent carbon nanotube (CNT) electrode using a conductive dispersant. The transparent CNT electrode comprises a transparent substrate and a CNT thin film formed on a surface the transparent substrate wherein the CNT thin film is formed of a CNT composition comprising CNTs and a doped dispersant. Further disclosed is a method for producing the transparent CNT electrode.The transparent CNT electrode exhibits excellent conductive properties, can be produced in an economical and simple manner by a room temperature wet process, and can be applied to flexible displays. The transparent CNT electrode can be used to fabricate a variety of devices, including image sensors, solar cells, liquid crystal displays, organic electroluminescence (EL) displays and touch screen panels, that are required to have both light transmission properties and conductive properties.

A bio-implantable electrochemical cell system for active implantable medical devices. In one embodiment, the fuel cell includes an electrode structure consisting of immobilized anode and cathode enzymes deposited on nanostructured high-surface-area metal nanowires or carbon nanotube electrodes. The anode enzyme comprises immobilized glucose oxidase and the cathode enzyme comprises immobilized laccase. Glucose is oxidized at the surface of the anode and oxygen is reduced at the surface of the cathode. The coupled glucose oxidation-oxygen reduction reactions provide a self-generating current source. In another embodiment, the nanowires or carbon nanotubes, along with the adjacent surface anode and cathode electrodes, are coated with immobilized glucose oxidase and immobilized laccase containing biocolloidal substrates, respectively. This results in the precise construction of an enzyme architecture with control at the molecular level, while increasing the reactive surface area and corresponding output power by at least two orders of magnitude.

An object of the invention is to provide a carbon nanotube electrode which is suited to quantity production and advantageous in cost, and a process for producing the same. When carbon nanotubes on respective catalyst particles 12 on an endless belt 3 gradually fall down to a horizontal position while moving around a driven drum 2 after traveling from a CVD zone to a transfer zone with the movement of the belt, the carbon nanotubes 11 have their outer ends pressed against a conductive film 8. The conductive film 8 is sent out from a film feeder 9 downward and heated by a heater 10 to a temperature not lower than the softening temperature of the film to below the melting temperature thereof. The carbon nanotubes 11 are transferred from the catalyst particles 12 to the conductive film 8 substantially perpendicular to the film surface by being pressed against the conductive film 8 in this way.

Provided are a phase change memory device that can operate at low power and improve the scale of integration by reducing a contact area between a phase change material and a bottom electrode, and a method for fabricating the same. The phase change memory comprises a current source electrode, a phase change material layer, a plurality of carbon nanotube electrodes, and an insulation layer. The current source electrode supplies external current to a target. The phase change material layer is disposed to face the current source electrode in side direction. The carbon nanotube electrodes are disposed between the current source electrode and the phase change material layer. The insulation layer is formed outside the carbon nanotube electrodes and functions to reduce the loss of heat generated at the carbon nanotube electrodes.

The present invention provides a highly reliable energy storage device capable of preventing a reaction current from flowing in a carbon nanotube electrode by ionizing a catalyst metal or a substrate metal to cause the metal to flow out to an electrolytic solution. An energy storage device of the present invention includes: at least a pair of electrode bodies that are a cathode and an anode; and an electrolytic solution. At least one of the electrode bodies is configured such that a layer of carbon nanotubes is formed on an electric conductor. A coupling region where one ends of the carbon nanotubes are coupled to and electrically connected to the electric conductor and a non-coupling region where ends of the carbon nanotubes are not coupled to the electric conductor are formed on a surface of the electric conductor. The carbon nanotubes having one ends connected to the coupling region are toppled to cover a surface of the non-coupling region.

Provided is a transparent carbon nanotube (CNT) electrode comprising a net-like (i.e., net-shaped) CNT thin film and a method for preparing the same. More specifically, a transparent CNT electrode comprises a transparent substrate and a net-shaped CNT thin film formed on the transparent substrate, and a method for preparing a transparent CNT electrode, comprising forming a thin film using particulate materials and CNTs, and then removing the particulate materials to form a net-shaped CNT thin film. The transparent CNT electrode exhibits excellent electrical conductivity while maintaining high light transmittance. Therefore, the transparent CNT electrode can be widely used to fabricate a variety of electronic devices, including image sensors, solar cells, liquid crystal displays, organic electroluminescence (EL) displays, and touch screen panels, that have need of electrodes possessing both light transmission properties and conductive properties.

One embodiment of the present invention provides a process for fabricating an electrode for a capacitor using carbon nanotubes (CNTs), wherein the electrode comprises a metal substrate and a layer of active material (CNTs) coated onto the metal substrate. Specifically, the process starts by dispersing CNTs in a solvent to form a suspension. Next, the CNTs are charged in the suspension. The metal substrate is then immersed in the suspension. Next, the CNTs are deposited onto the metal substrate using electrophoretic deposition (EPD) to form the layer of active material on the metal substrate. In particular, the layer of active material is formed on the metal substrate without using a binder, which effectively reduces contact resistance between the active material and the metal substrate.

The present invention provides an energy device including a carbon nanotube electrode which prevents a carbon nanotube from peeling from an electric conductor. The energy device includes rolled electrode bodies, wherein at least one of the electrode bodies is formed such that a carbon nanotube layer is formed on the electric conductor, and concave regions are formed in a stripe shape on the carbon nanotube layer so as to extend in a direction parallel to a roll axis.

One embodiment of the present invention provides a process for fabricating an electrode for a capacitor using carbon nanotubes (CNTs), wherein the electrode comprises a metal substrate and a layer of active material (CNTs) coated onto the metal substrate. Specifically, the process starts by dispersing CNTs in a solvent to form a suspension. Next, the CNTs are charged in the suspension. The metal substrate is then immersed in the suspension. Next, the CNTs are deposited onto the metal substrate using electrophoretic deposition (EPD) to form the layer of active material on the metal substrate. In particular, the layer of active material is formed on the metal substrate without using a binder, which effectively reduces contact resistance between the active material and the metal substrate.

An apparatus uses carbon nanotubes for electrochemical analysis of biological molecules of interest such as Uric Acid, illustrating how the voltammetric behaviors of uric acid (UA) and L-ascorbic acid (L-AA) at a well-aligned, carbon nanotube, electrode may be used in a biochemical assay. Compared to glassy carbon, a carbon nanotube electrode reduces troublesome overpotentials. Based on its differential catalytic function toward the oxidation of UA and L-AA, the carbon nanotube electrode can be used for a selective determination of UA in the presence of L-AA. The peak current obtained from DPV was linearly dependent on the UA concentration in the range of 0.2 μM to 80 μM with a correlation coefficient of 0.997. The detection limit (3δ) for UA was found to be 0.1 μM. The device allows for detection of UA in a human urine sample, even in the presence of high concentrations of L-AA, using only simple dilution.

Disclosed herein is a dye-sensitized solar cell module having carbon nanotube electrodes, the solar cell module comprising: upper and lower transparent substrates; conductive transparent electrodes formed on the inner surfaces of the upper and lower transparent substrates; a plurality of porous oxide semiconductor negative electrodes formed on the upper conductive transparent electrode at a constant interval and having a dye adsorbed on the surface thereof; counter electrodes formed on the lower conductive transparent electrode in a thin film form and made of a carbon nanotube layer as a positive electrode portion corresponding to the negative electrodes; grid electrodes formed on the upper and lower conductive transparent electrodes between unit electrodes, each consisting of the negative electrode and the counter electrode corresponding thereto, the grid electrodes serving to collect electrons generated by photosensitization; connecting electrodes formed on the upper and lower conductive transparent electrodes and electrically connected with the grid electrode so as to transfer electrons moved from the grid electrodes to the outside; and electrolyte placed between the negative electrodes and the counter electrodes. Also disclosed is a method for manufacturing the solar cell module. According to the disclosed invention, a high-efficiency, large-area, dye-sensitized solar cell comprising carbon nanotubes is realized by forming a plurality of dye-sensitized solar cell units in a module arrangement, and forming grid electrodes and connection electrodes for the collection and movement of electrons. Thus, the disclosed invention has high practical utility.

The invention relates to structural design of hybrid type super capacitor. In the invention, conducting polyaniline and Nano carbon tube are as active materials of positive and negative poles of super capacitor respectively. The structure of the super capacitor is positive pole current collector / polyaniline pole / electrolyte and membrane Nano carbon tube pole / negartive current collector. Polyaniline / nano carbon tube hybrid type super capacitor can gave play to potential of pole material fully, forming function of coordination and complementation, and possessing higher specific energy and specific power. Comparing with super capacitor made from Nano carbon tube, specific energy of hybrid type super capacitor is raised 135 %, and average specific power is raised 7%. Comparing with super capacitor made from polyaniline specific energy of hybrid type super capacitor is raised30%, and average specific power is raised 100%.

The invention discloses a preparation method of monolayer manganese dioxide nano-plates, including the following steps: (1) manganese nitrate is reacted with sodium hydroxide or potassium hydroxide with the existence of oxidant to produce NaxMnO2 or KxMnO2 having ordered laminated structure; (2) the NaxMnO2 or KxMnO2 having ordered laminate structure is added to sodium hydroxide aqueous solution, OHxMnO2 is obtained by hydro-thermal synthesis method, and the obtained OHxMnO2 is fully acid-cleaned to obtain HxMnO2; (3) tetrabutylammonium hydroxide or tetramethylammonium hydroxide is used for reacting with laminated HxMnO2, and the tetrabutylammonium hydroxide or tetramethylammonium hydroxide is inserted inside the laminated HxMnO2 so that the laminated HxMnO2 is dispersed into monolayer manganese dioxide nano-plates. The manganese dioxide nano-plates obtained in the invention have monolayer with the thickness of just 0.3 to 0.8 nm; and as electrode material, the chemical performance of manganese dioxide nano-plate electrode is obviously higher than that of carbon nanotube electrode.

An integrated circuit capacitor includes first and second electrodes and at least one dielectric layer extending between the first and second electrodes. The first electrode includes at least one carbon nanotube. The capacitor further includes an electrically conductive catalyst material. This catalyst material may be selected from the group consisting of iron, nickel and cobalt and alloys thereof.

An electrode for a battery is augmented with vertically aligned carbon nanotubes, allowing both improved storage density of lithium ions and the increase electrical and thermal conductivity. Carbon nanotubes are extremely good electrical and thermal conductors, and can be grown directly on the electrode (e.g., anode or cathode) current collector metals, allowing direct electrical contact. Additionally carbon nanotubes have an ideal aspect ratio, having lengths potentially thousands of times as long as their widths, 10 to 1,000 nanometers. In an embodiment, the carbon nanotube electrode (e.g., a cathode) comprises embedded elemental sulfur, allowing both the improved retention of elemental sulfur and increase electrical conductivity. The surface of carbon nanotubes are nearly chemically identical to carbon, binding the sulfur atoms to the carbon nanotubes, preventing the “loss” of sulfur with the formation of LiS intermediate products.

The invention belongs to the field of flexible sensing and the field of micro-nano systems, and specifically relates to a method for manufacturing a flexible pressure sensor based on "V" groove array electrodes. The fabrication method of flexible pressure sensor based on "V"-shaped array electrodes, including the preparation of flexible pressure sensor "V"-groove array electrodes and the preparation of carbon nanotubes / PDMS polymers, two flexible pressure sensors "V" The groove array electrodes are used as the upper electrode and the lower electrode respectively, and the carbon nanotube / PDMS composite film is used as the intermediate dielectric layer, and the flexible pressure sensor is formed by packaging. Aiming at the problem of poor adhesion between metal materials and flexible substrates, the present invention selects polydimethylsiloxane (PDMS) as the flexible substrate material, metal Ag as the electrode material, and uses the plasma process to modify the surface of the PDMS flexible substrate The treatment is used to enhance the adhesion between metal Ag and PDMS, and the designed "V" groove array microelectrode structure effectively solves the problem of metal electrode fracture when the flexible pressure sensor undergoes large deformation.

The present invention provides an electrode made of carbon nanotubes or carbon nanofibers and a process for preparing the same. The electrode comprising a current collector, sulfur or metal nanoparicles as a binder, and carbon nanotubes or carbon nanofibers is characterized in that the sulfur or metal nanoparticles are bonded, deposited, or fused on the surfaces of the carbon nanotubes or carbon nanofibers so that the carbon nanotubes or carbon nanofibers are bonded to each other and also bonded to the current collector. The electrode prepared according to the present invention exhibits low internal resistance, strong durability and low equivalent series resistance, and therefore the electrode can be effectively used for secondary batteries, supercapacitors or fuel cells.

The present invention relates to a carbon nanotube composite electrode material, a method for manufacturing the same and an electrode including the carbon nanotube composite material. The carbon nanotube electrode material includes carbon fibers and carbon nanotubes. The carbon fibers constitute a network structure. The carbon nanotubes are wrapped around and adhering to the carbon fibers. Because a diameter of the carbon fibers is about 100 times larger than that of the carbon nanotubes, gaps between the carbon fibers are also larger than that between the carbon nanotubes such that electrolytes can easily penetrate into the carbon fibers and come into contact with all or nearly all of the available surface area of the carbon nanotubes. In other words, an effective surface area of the carbon nanotubes is improved, and capacity of electrode material is also improved.

Disclosed are to provide a modified carbon nanotube obtained by reacting a polymer to a carbon nanotube by a radical graft method, capable of minimizing lowering of a physical property of a carbon nanotube caused when being modified, and capable of enhancing dispersibility of the carbon nanotube and an adhesion strength between carbon nanotubes, the polymer having a molecular weight controlled by a living radical polymerization and still having a living radical end group.Also disclosed are to provide a carbon nanotube electrode and a dye-sensitized solar cell using the same, capable of forming a carbon nanotube film having a thickness thinner than that of the conventional electrode by directly spraying, on a substrate, by an electro-spray process, a uniform dispersion solution that the modified carbon nanotube is dispersed in a proper solvent without requiring an additional organic binder, capable of exhibiting an excellent catalytic characteristic owing to a close adhesion strength between carbon nanotubes and an increased relative density of the carbon nanotube film, and capable of implementing an excellent long-term stability owing to a strong bonding force between a carbon nanotube and a substrate.

The invention discloses a directional carbon nano-tube composite cathode material for a lithium-sulfur secondary battery. A structure consisting of carbon nano-tubes with orientation, namely the directional carbon nano-tubes is used as a framework of the material, a carbon nano-tube / sulfur composite material is obtained by compounding, and the composite material can be used as the cathode material of the lithium-sulfur secondary battery. In a conductive network constructed by using disordered carbon nano-tubes, the contact resistance at a lap joint of the carbon nano-tubes in the conductive network is always greatly increased by the load of sulfur; however, with the adoption of the directional carbon nano-tubes, an electron channel contacts a current collector through one carbon nano-tube, so that the generation of a large amount of contact resistance is avoided, and an efficient conductive network is provided. Meanwhile, an ordered pore structure of a directional carbon nano-tube electrode also ensures that an ion channel is smooth, so that the cathode material has high cycle performance, is a high-performance cathode material, and is expected to promote further enhancement of the performance of the lithium-sulfur secondary battery and the industrial application of the lithium-sulfur secondary battery.

The invention provides a single-wall carbon nano tube-based ultrasensitive deoxyribonucleic acid (DNA) biosensor and a preparation method and application thereof. In the method, single-wall carbon nano tubes (SWCNTs) are grown on the surface of a silicon wafer on site by a chemical vapor deposition method, and gold nano particles are deposited on the surfaces of carbon nano tube electrodes by an electrochemical deposition technology. A single-stranded DNA (ssDNA) probe is self-assembled to the surfaces of SWCNTs-Au electrodes and subjected to hybridization reaction with complementary ssDNA. The change of electron transfer resistance before and after hybridization is recorded by utilizing the unique specific surface areas of the carbon nano tubes and the quick dynamic characteristics of the electrodes and by an electrochemical impedance method under the action of current signal amplification of nanometer gold to realize the quantitative detection of the complementary DNA. The detection limit of the sensor on the target DNA can reach between 10 and 20 M, so the sensor has the advantages of high sensitivity and selectivity, capability of being used repeatedly and the like, and has important significance in fields of medical diagnosis, the food industry, environment friendliness and the like.

The invention discloses a preparation method of a graphene-carbon nanotube composite material. The method comprises a first step in which graphite oxide and carbon nanotubes, by mass ratio of 1 to 0.005 to 0.5, are mixed and then put into water, and a dispersion is obtained after ultrasonic processing, a second step in which nitric acid is added and ultrasonic processing is carried out for 0.5 to 2 hours, and a third step in which a filter cake is filtered and dried, the obtained solid powder is put into a high-temperature furnace, heating processing under the temperature of 800 to 1200 DEG C is carried out for 1 to 5 hours, and the graphene-carbon nanotube composite material is obtained after cooling, washing, filtering and drying. The invention also discloses a graphene-carbon nanotube composite material prepared by the above preparation method and an electrochemical capacitor with the graphene-carbon nanotube composite material as an electrode material, the problem that the power density is low as a graphene-carbon nanotube electrode material is applied to the electrochemical capacitor of an ionic electrolyte is overcome, and the application range is expanded.

The invention discloses a preparation method of a series of polyacid, polyaniline and carbon nano tube electrode materials and application of the polyacid, polyaniline and carbon nano tube electrode materials to lithium ion batteries and super-capacitors. According to the technical scheme, the preparation method comprises the following steps: firstly, carrying out ultrasonic dispersion on a multi-wall carbon nano tube in hydrochloric acid; adding aniline and ammonium persulfate which are dissolved into hydrochloric acid for carrying out in-situ synthesis, so as to uniformly cover the multi-wall carbon nano tube with polyaniline; assembling polyacid on a polyaniline and carbon nano tube composite material by electrostatic bonding; and finally, forming an electrode material based on a polyacid / polyaniline / carbon nano tube. Compared with a reported polyaniline and carbon nano tube composite material and a pure carbon nano tube, the electrode material prepared by adopting the preparation method is used as a negative electrode of a lithium ion battery, so that the circulating stability is remarkably improved, and the discharging specific capacity and the speed capacity are obviously increased.