Wire-shaped perovskite devices and methods for manufacturing the same are provided. The perovskite devices have a uniform layer thickness of perovskite material on wire-shaped substrates of semi-conductor or carbon material. The method includes an electro-coating process, which advantageously allows for predictability and repeatability.

High-surface area carbon nanotubes having targeted, or selective, species of oxygen containing species levels, types and/or content on either or both of the interior and exterior of the tube walls are claimed. Such carbon nanotubes can have little to none inner tube surface oxygen containing species, or differing amounts and/or types of oxygen containing species between the tubes' inner and outer surfaces or amongst the carbon nanotubes. Additionally, such high-surface area carbon nanotubes or their assemblages may have greater lengths and diameters, creating useful mechanical, electrical, and thermal properties.

The inventive concept described herein relates to nanostructured carbons having improved characteristics, and method of preparing the same.

Methods permit the growth of two or more nanomaterials in a common process chamber in the same batch run, either simultaneously or sequentially, using one or a combination of CVD, CVI, or other techniques. The methods described can be beneficial for forming nanosilicon-containing nanocarbon structures suitable for use as a battery anode material.

The present invention relates to a method for the production of a carbon nanotube structure which has substantially aligned carbon nanotubes (CNTs) and to a temperature-controlled flow-through reactor.

The present disclosure is directed to the preparation of highly metallic, hydrophilic, polymer-free carbon nanotube (CNT) thin sheets with high tensile strength. The densified CNT sheet has reduced pore sizes, increased tensile strength, and improved electrical conductivity. The disclosed CNT materials can be used as filtration membranes with little or no propensity toward surface fouling. Such densified CNT sheets are also useful as superior electromagnetic interference (EMI) shielding materials.

A method of making carbon nanotubes doped with iron, nitrogen and sulphur for an oxygen reduction reaction catalyst includes the steps of mixing an iron containing oxidising agent with a sulphur-containing dye to form a fibrous fluctuate of reactive templates and using these for in-situ polymerisation of an azo compound to form polymer-dye nanotubes, adding an alkali to precipitate magnetite, and subjecting the nanotubes to pyrolysis, acid leaching, and heat treatment.

An electrode membrane having high adhesiveness and electrical conductivity can be produced using carbon nanotubes each of which meets the following requirements (1) and (2). (1) A peak appears at a diffraction angle 2=252 in powder X-ray diffraction analysis, and the half value width of the peak is 2 or more and less than 3. (2) The G/D ratio is 1.5 to 5.0, wherein G represents the maximum peak intensity in the range from 1560 to 1600 cm.sup.1 and D represents the maximum peak intensity in the range from 1310 to 1350 cm.sup.1 in Raman spectra.

A method for obtaining metallic carbon nanotubes is provided. An insulating substrate comprising hollow portions and non-hollow portions is provided. A plurality of electrodes is formed on a surface of the non-hollow portions. A plurality of carbon nanotubes is formed on a surface of the insulating substrate, and the carbon nanotubes stretch across the hollow portions. The insulating substrate, the plurality of electrodes and the carbon nanotubes are placed into a cavity, and the cavity is evacuated. A voltage is applied between any two electrodes, and photos of carbon nanotubes suspended between the two electrodes are taken. In the photo, darker ones are semiconducting carbon nanotubes, and brighter ones are metallic carbon nanotubes. Finally, the semiconducting carbon nanotubes are removed.

Disclosed herein is a conductive grease composition that includes a functionalized carbon nanomaterial and/or boron nanomaterial and a base oil. The nanomaterial and base oil forms hydrogen bond network in the disclosed composition. Because of the formed hydrogen bonds, the disclosed grease exhibits enhanced thermal or electrical conductivity. Also disclosed is a method to improve thermal or electrical conductivity of an existing grease composition.