There is provided a method of manufacturing a polycrystalline silicon rod suitable as a raw material for manufacturing monocrystalline silicon by a FZ process. The method of manufacturing a polycrystalline silicon rod according to the present invention is a method of manufacturing a polycrystalline silicon rod by Siemens process, and includes a post-deposition energization step of, after an end of a deposition step of polycrystalline silicon, performing energization under a condition that provides a skin depth D shallower than a skin depth D.sub.0 provided at a time when the deposition step ends. For example, the post-deposition energization step is performed by passage of current at a frequency f higher than a frequency f.sub.0 of current that is passed at a time when the deposition step ends.

A device for making a carbon nanotube array includes a chamber, a gas diffusing unit, and a gas transporting pipe. The chamber defines a first inlet and a second inlet spaced apart from each other. The gas diffusing unit is in the chamber, and the gas diffusing unit is a hollow structure and defines a space, a first through hole, and an outlet. The gas transporting pipe has a first end and a second end opposite to the first end. The first end extends out of the chamber from the second inlet, and the second end is in the chamber and connected to the first through hole. The present application also relates to a method for making the carbon nanotube array.

A method for making carbon nanotube film includes providing a growth substrate having a first surface and a second surface opposite to the first surface. A catalyst layer is placed on the first surface. The growth substrate and the catalyst layer are placed in a reaction chamber. The carbon source gas and hydrogen are supplied into the reaction chamber at a growth temperature of a plurality of carbon nanotubes. An electric field is applied to the growth substrate, wherein an electric field direction of the electric field is from the first surface to the second surface. After the plurality of carbon nanotubes fly away from the growth substrate, the electric field is stopped applying to the growth substrate, and the carbon source gas and hydrogen are continually supplied into the reaction chamber.

The disclosed methods and apparatus improve the fabrication of solid fibers and microstructures. In many embodiments, the fabrication is from gaseous, solid, semi-solid, liquid, critical, and supercritical mixtures using one or more low molar mass precursor(s), in combination with one or more high molar mass precursor(s). The methods and systems generally employ the thermal diffusion/Soret effect to concentrate the low molar mass precursor at a reaction zone, where the presence of the high molar mass precursor contributes to this concentration, and may also contribute to the reaction and insulate the reaction zone, thereby achieving higher fiber growth rates and/or reduced energy/heat expenditures together with reduced homogeneous nucleation. In some embodiments, the invention also relates to the permanent or semi-permanent recording and/or reading of information on or within fabricated fibers and microstructures. In some embodiments, the invention also relates to the fabrication of certain functionally-shaped fibers and microstructures. In some embodiments, the invention may also utilize laser beam profiling to enhance fiber and microstructure fabrication.

In a method, a charged metal dot is deposited on a first position of a surface of a semiconductor substrate. Then, a charged region is formed on a second position of the surface of the semiconductor substrate, thereby establishing of which an electric field direction from the first position toward the second position. The first position is spaced apart from the second position by a distance. Thereafter, a precursor gas flows along the electric field direction on the semiconductor substrate, thereby forming a carbon nanotube (CNT) on the semiconductor substrate.

A device for making a carbon nanotube array includes a chamber, a gas diffusing unit, and a gas transporting pipe. The chamber defines a first inlet and a second inlet spaced apart from each other. The gas diffusing unit is in the chamber, and the gas diffusing unit is a hollow structure and defines a space, a first through hole, and an outlet. The gas transporting pipe has a first end and a second end opposite to the first end. The first end extends out of the chamber from the second inlet, and the second end is in the chamber and connected to the first through hole. The present application also relates to a method for making the carbon nanotube array.

In one embodiment, a product includes a plurality of carbon nanotubes and a fill material in interstitial spaces between the carbon nanotubes for limiting or preventing fluidic transfer between opposite sides of the product except through interiors of the carbon nanotubes. Moreover, the longitudinal axes of the carbon nanotubes are substantially parallel, where an average inner diameter of the carbon nanotubes is about 20 nanometers or less. In addition, the ends of the carbon nanotubes are open and the fill material is impermeable or having an average porosity that is less than the average inner diameter of the carbon nanotubes.

The disclosed methods and apparatus improve the fabrication of solid fibers and microstructures. In many embodiments, the fabrication is from gaseous, solid, semi-solid, liquid, critical, and supercritical mixtures using one or more low molar mass precursor(s), in combination with one or more high molar mass precursor(s). The methods and systems generally employ the thermal diffusion/Soret effect to concentrate the low molar mass precursor at a reaction zone, where the presence of the high molar mass precursor contributes to this concentration, and may also contribute to the reaction and insulate the reaction zone, thereby achieving higher fiber growth rates and/or reduced energy/heat expenditures together with reduced homogeneous nucleation. In some embodiments, the invention also relates to the permanent or semi-permanent recording and/or reading of information on or within fabricated fibers and microstructures. In some embodiments, the invention also relates to the fabrication of certain functionally-shaped fibers and microstructures. In some embodiments, the invention may also utilize laser beam profiling to enhance fiber and microstructure fabrication.

The disclosed methods and apparatus improve the fabrication of solid fibers and microstructures. In many embodiments, the fabrication is from gaseous, solid, semi-solid, liquid, critical, and supercritical mixtures using one or more low molar mass precursor(s), in combination with one or more high molar mass precursor(s). The methods and systems generally employ the thermal diffusion/Soret effect to concentrate the low molar mass precursor at a reaction zone, where the presence of the high molar mass precursor contributes to this concentration, and may also contribute to the reaction and insulate the reaction zone, thereby achieving higher fiber growth rates and/or reduced energy/heat expenditures together with reduced homogeneous nucleation. In some embodiments, the invention also relates to the permanent or semi-permanent recording and/or reading of information on or within fabricated fibers and microstructures. In some embodiments, the invention also relates to the fabrication of certain functionally-shaped fibers and microstructures. In some embodiments, the invention may also utilize laser beam profiling to enhance fiber and microstructure fabrication.

A core wire holder 3 attached on an electrode 2 placed on a bottom panel of a device 20 for producing silicon by Siemens process includes a silicon core wire holding portion 9 being generally circular truncated cone-shaped, and holding and energizing a silicon core wire 4. The silicon core wire holding portion 9 includes a generally circular truncated cone having an upper surface formed with a silicon core wire insertion hole 7 for holding the silicon core wire 4, and the silicon core wire holding portion 9 includes an upper surface and a side surface, which form a ridge having a curved surface and serving as a chamfered portion 8.