Abstract: This sensor has: a first capacitance electrode comprising a plate-shaped conductor or semiconductor; a first terminal electrically connected to the first capacitance electrode; a first insulating film disposed at one surface of the first capacitance electrode; a second capacitance electrode comprising a conductor or semiconductor and disposed in a manner so as to oppose a portion of the first capacitance electrode with the first insulating film therebetween; a second terminal electrically connected to the second capacitance electrode; a variable resistance element disposed on the first insulating film; and a reaction section disposed on the other surface of the first capacitance electrode in a direct manner or with a second insulating film therebetween. The variable resistance element includes: a base body disposed on the first insulating film; a third terminal connected to one end of the base body; and a fourth terminal connected to the other end of the base body.

Abstract: This sensor has: a first capacitance electrode comprising a plate-shaped conductor or semiconductor, a first terminal electrically connected to the first capacitance electrode; a first insulating film disposed at one surface of the first capacitance electrode; a second capacitance electrode comprising a conductor or semiconductor and disposed in a manner so as to oppose a portion of the first capacitance electrode with the first insulating film therebetween; a second terminal electrically connected to the second capacitance electrode; a variable resistance element disposed on the first insulating film; and a reaction section disposed on the other surface of the first capacitance electrode in a direct manner or with a second insulating film therebetween. The variable resistance element includes: a base body disposed on the first insulating film; a third terminal connected to one end of the base body; and a fourth terminal connected to the other end of the base body.

Abstract: A high-sensitivity field effect transistor using as a channel ultrafine fiber elements such as carbon nanotube, and a biosensor using it. The field effect transistor comprises a substrate, a source electrode and a drain electrode arranged on the substrate, a channel for electrically connecting the source electrode with the drain electrode, and a gate electrode causing polarization due to the movement of free electrons in the substrate. For example, the substrate has a support substrate consisting of semiconductor or metal, a first insulating film formed on a first surface of the support substrate, and a second insulating film formed on a second surface of the support substrate, the source electrode, the drain electrode, and the channel arranged on the first insulating film, the gate electrode disposed on the second insulating film.

Abstract: This invention provides a process for producing a carbon nanotube fragment. In particular, this invention provides a method of producing a carbon nanotube fragment by the steps of 1) dispersing a carbon nanotube in a mixed acid of sulfuric acid and nitric acid, and 2) subjecting the dispersed carbon nanotube to an oxidation treatment to obtain a dispersion of carbon nanotube fragment in the mixed acid. Preferably, in the oxidation treatment the dispersed carbon nanotube is oxidized with a hydrogen peroxide added in the mixed acid.

Abstract: A single-electron transistor comprising at least a substrate, a source electrode and a drain electrode formed on top of the substrate opposing to each other, and a channel arranged between the source electrode is disclosed wherein the channel is composed of ultra fine fibers. By having such a constitution, a sensor can have excellent sensitivity.

Abstract: A single-electron transistor comprising at least a substrate, a source electrode and a drain electrode formed on top of the substrate opposing to each other, and a channel arranged between the source electrode is disclosed wherein the channel is composed of ultra fine fibers. By having such a constitution, a sensor can have excellent sensitivity.

Abstract: A single-electron transistor comprising at least a substrate, a source electrode and a drain electrode formed on top of the substrate opposing to each other, and a channel arranged between the source electrode is disclosed wherein the channel is composed of ultra fine fibers. By having such a constitution, a sensor can have excellent sensitivity.

Abstract: This invention provides a process for producing a carbon nanotube electric field effect transistor that can improve yield in channel preparation. Carbon nanotubes dispersed in a mixed acid composed of sulfuric acid and nitric acid are subjected to radical treatment with aqueous hydrogen peroxide to cut the carbon nanotubes and thus to provide carboxyl-introduced carbon nanotube fragments. The carbon nanotube fragments are attached, through a covalent bond and/or an electrostatic bond, to a site, where a source electrode is to be formed, and a site where a drain electrode is to be formed, in a substrate with a functional group, to be attached to a carboxyl group, introduced thereinto. The carbon nanotube fragments attached to the substrate are attached to carbon nanotubes as channels through n-n interaction to fix the carbon nanotubes as channels to the substrate.

Abstract: A high-sensitivity field effect transistor using as a channel ultrafine fiber elements such as carbon nanotube, and a biosensor using it. The field effect transistor comprises a substrate, a source electrode and a drain electrode arranged on the substrate, a channel for electrically connecting the source electrode with the drain electrode, and a gate electrode causing polarization due to the movement of free electrons in the substrate. For example, the substrate has a support substrate consisting of semiconductor or metal, a first insulating film formed on a first surface of the support substrate, and a second insulating film formed on a second surface of the support substrate, the source electrode, the drain electrode, and the channel arranged on the first insulating film, the gate electrode disposed on the second insulating film.

Abstract: A single-electron transistor comprising at least a substrate, a source electrode and a drain electrode formed on top of the substrate opposing to each other, and a channel arranged between the source electrode is disclosed wherein the channel is composed of ultra fine fibers. By having such a constitution, a sensor can have excellent sensitivity.

Abstract: A fibrous solid carbon manifold assembly and a method for producing the fibrous solid carbon manifold assembly are provided. The fibrous solid carbon manifold assembly has fibrous bodies carbonized, and a limitless number of superfine graphite filaments grown on surfaces of the carbonized fibrous bodies, in the inside of each of said fibrous bodies and in a gap between adjacent ones of said fibrous bodies. With such a configuration, the number of superfine graphite filaments can be increased more greatly.

Abstract: A fibrous solid carbon manifold assembly and a method for producing the fibrous solid carbon manifold assembly are provided. The fibrous solid carbon manifold assembly has fibrous bodies carbonized, and a limitless number of superfine graphite filaments grown on surfaces of the carbonized fibrous bodies, in the inside of each of said fibrous bodies and in a gap between adjacent ones of said fibrous bodies. With such a configuration, the number of superfine graphite filaments can be increased more greatly.

Abstract: A fibrous solid carbon manifold assembly and a method for producing the fibrous solid carbon manifold assembly are provided. The fibrous solid carbon manifold assembly has fibrous bodies carbonized, and a limitless number of superfine graphite filaments grown on surfaces of the carbonized fibrous bodies, in the inside of each of said fibrous bodies and in a gap between adjacent ones of said fibrous bodies. With such a configuration, the number of superfine graphite filaments can be increased more greatly.

Abstract: A laser irradiating body with a laser inlet and a laser outlet is provided, and plural semiconductor lasers to oscillate plural linear laser beams for measuring a welding state are provided. Then, a CCD camera with a band-pass filter therein to pass through only the reflected linear laser beams is provided. The CCD camera takes, as an image, the measured welding state by the reflected linear laser beams in. Moreover, an image processor to process the image of the measured welding state is provided.

Abstract: An electromagnetic wave absorber including: a porous substrate having a large number of pores piercing the porous substrate; and an absorbent film formed on circumferential surfaces of the pores and constituted by a mixture of an electromagnetic wave absorbing filler and an electromagnetic wave absorving high-molecular material, wherein the pores are not blocked with the absorbent film so that the pores are permeable to gas. Accordingly, the electromagnetic wave absorber is high in electromagnetic wave absorbing performance, can be made thin and lightweight and is so excellent in reliability that the electromagnetic wave absorbing performance can be offered over a very broad range.

Abstract: A magnetic recording element is composed of a first magnetic film to generate spin vortex by an external magnetic field and a second magnetic film having a magnetization perpendicular to the surfaces thereof, and also an insulating layer to control (repress) a current through the magnetic recording element which is formed between the first magnetic film and the second magnetic film. A given external magnetic field is applied to the magnetic recording element, to generate a spin vortex in the first magnetic film and then, generate a vertical magnetization at the center of the spin vortex. Then, a given data is written on the vertical magnetization.

Abstract: A scanning magnetism detector includes a probe made of a solid material formed of a single crystal having spin polarization and electrical conductivity properties. When the probe is brought into proximity with a magnetic substance, a surface condition of the magnetic substance can be detected by measuring tunnel current flow between the probe and the surface of the magnetic substance.

Abstract: An electromagnetic wave absorber including: a porous substrate having a large number of pores piercing the porous substrate; and an absorbent film formed on circumferential surfaces of the pores and constituted by a mixture of an electromagnetic wave absorbing filler and an electromagnetic wave absorbing high-molecular material, wherein the pores are not blocked with the absorbent film so that the pores are permeable to gas. Accordingly, the electromagnetic wave absorber is high in electromagnetic wave absorbing performance, can be made thin and lightweight and is so excellent in reliability that the electromagnetic wave absorbing performance can be offered over a very broad range.

Abstract: A fibrous solid carbon manifold assembly and a method for producing the fibrous solid carbon manifold assembly are provided. The fibrous solid carbon manifold assembly has fibrous bodies carbonized, and a limitless number of superfine graphite filaments grown on surfaces of the carbonized fibrous bodies, in the inside of each of said fibrous bodies and in a gap between adjacent ones of said fibrous bodies. With such a configuration, the number of superfine graphite filaments can be increased more greatly.

Abstract: A probe for measuring a leakage magnetic field includes a substrate, a flexible cantilever having one end fixed to the substrate and a free end, and at least one magneto resistive element arranged on the free end of the cantilever. The magneto resistive element has a width within a range from 10 nm to 1 &mgr;m as measured in a direction perpendicular to a longitudinal direction of the cantilever and in a direction in which the cantilever can be deflected.