47 results about "Debye length" patented technology

A renal denervation device can include an elongated catheter body extending along a longitudinal axis, and an assembly connected to the catheter body. The assembly includes a plurality of heating elements connected to the catheter body. Each heating element has a conductor and a layer of an RF dissipating material such as a polymer overlying the conductor. During operation of the device, the layer of RF dissipating material is disposed between the conductor and body tissues of a subject. The layer of RF dissipating material is substantially thicker than the Debye length within the material in order to reduce the electric field reaching the tissue and to eliminate direct contact of the electrode with the body tissue.

Techniques and apparatus for substantially reducing and / or preventing the occurrence of plasma un-confinement events, including one or more of shielding a gap disposed between chamber components and along a RF current path with a dielectric shielding structure, shielding a sharp component structure with a dielectric shielding structure, and keeping the gap between adjacent pairs of plasma confinement rings smaller than the worst-case DeBye length for the plasma.

The systems and methods described herein include a sensor for suitable for sensing chemical and biological substances. The sensor comprises a semiconductor layer formed in or on a substrate and a channel having nano-scale dimensions formed in the semiconductor layer, where the structure creates an electrically conducting pathway between a first contact and a second contact on the semiconductor layer. In certain preferred embodiments, the nano-scale channel has a trapezoidal cross-section with an effective width and exposed lateral faces, where the effective width is selected to have same order of magnitude as a Debye length (LD) of the semiconductor material of which the semiconductor layer is formed.

Provided is a field effect transistor (FET) type biosensor including a source electrode, a gate, and a drain electrode. A ligand that can bind to a side of a nucleic acid is added to the surface of the gate. In a conventional FET type biosensor, it is difficult to detect a signal within the debye length because a target nucleic acid is directly fixed to the surface of a gate of the conventional FET. However, in the present invention, this problem can be overcome and the debye length can be increased by treating the surface of a gate of an FET sensor with a ligand that can bind to a side of a nucleic acid. The ligand can be adsorbed onto the surface of the gate. In this case, the nucleic acid is adsorbed parallel to the surface of the gate, not perpendicular to the surface of the gate, thus generating an effective depletion region. In addition, hybridization efficiency can be increased because a hybridized sample can be injected into an FET sensor at high ionic strength.

A gas sensor includes a semiconductor substrate on which is disposed at least one field electrode, and advantageously a plurality of field electrodes. The field electrodes are disposed under a gas-sensitive semiconductor resistive film, with an insulator layer in between. The film, which may be in electrical contact with a pair of external electrodes, may comprise a metal oxide, such as for example SnO2, WO3, In2O3, Ga2O3, Cr2-xTixO3+z, or various organic semiconductors. The field electrodes produce an electric field acting on the semiconductor, and an electroadsorptive effect may occur when the thickness of the gas-sensitive film is on the order of the Debye length. In the case of the known gas-sensitive material SnO2, for example, the Debye length may be approximately 60 to 80 nm. An electric field produced in the body of the gas sensor may be effective up to the surface of the gas-sensitive film that is exposed to the gas, i.e., the films lying above the gate electrode do not screen the electric field. The use of a plurality of field electrodes may make it possible to offset or control the gradient in the surface potential variation.

A sensor including a surface plasmon resonance detector with a reservoir for containing a liquid sample. The sensor further includes a sensing metallic film positioned within the reservoir so that at least a majority of a surface of the sensing metallic film is to be in contact with the liquid sample being housed within the reservoir. The sensory also includes a semiconductor device having a contact in electrical communication with the sensing metal containing film that is positioned within the reservoir. The semiconductor device measures the net charges of molecules within the liquid sample within a Debye length from the sensing metallic film.

Holographic optical tweezers are used to position charge stabilized colloidal particles within a flow cell. Once the particles are positioned, fixation is accomplished by pumping an electrolyte solution or pH adjusted solution (or a combination of the two) into the sample cell. In the former, the Debye length is reduced and aggregation caused by the van der Waals attraction takes place. In the latter, the surface charge density of the suspension is reduced and aggregation caused by the van der Waals attraction takes place. This technique can be applied multiple times, and allows for the formation of two and three dimensional structures composed of multi-colloid types to be formed on or away from a substrate. The technique relies upon forces acting on virtually all colloidal dispersions making it applicable to a wide variety of colloid types and compositions, such as formation of photonic crystals, colloidal electronics, and bioengineered materials.

The invention relates to a plasma density measuring equipment of high temperature resistant embedded double-probe type, which is used for measuring plasmas with a density of 108 to 1011 centimeters <-3> around an aircraft during reentry flying and mainly consists of two iridium electrode probes, two probe electrode protection rings, a boron nitride insulating base, two electrode connection wires and a detection circuit, wherein metal iridium is used as the an electrode of the embedded double probes and boron nitride is used as an insulating electrode; the probe electrode protection rings are set to reduce edge effects and enhance measuring precision; the distances between the probe electrode protection rings and the iridium electrode probes are less than or equal to the Debye length. The measuring equipment disclosed by the invention can be mounted on the surface of a reentry aircraft directly for real-time measuring the density of the plasmas in a boarder layer continuously; the probes are oxidation resisting; the aerodynamic shape of the aircraft cannot be affected, so that the density measuring equipment is capable of measuring continuously for a long time, small in volume and high in precision.

The invention relates to a preparation method for a hierarchical hollow cubic stannic oxide nanometer particle composed of ultrafine nano-rods and belongs to the technical field of nanometer material preparation. The method comprises the following steps: taking solid cubic zinc hydroxystannate as a precursor, covering a layer of stannic oxide nano-rods on the surface of the zinc hydroxystannate after the hydrothermal reaction for a period of time, and meanwhile, decomposing the inner zinc hydroxystannate, thereby acquiring the hierarchical hollow cubic stannic oxide nanometer particle composed of the ultrafine nano-rods in the shape similar to the shape of zinc hydroxystannate. Compared with the traditional template method, the preparation method has the advantages of low cost, few steps and simple operation; the prepared hollow stannic oxide nanometer particle has an obvious hierarchical structure and a mesoporous structure, is difficult to agglomerate, is excellent in crystallinity and is high in specific surface area; the hierarchical hollow cubic stannic oxide nanometer particle is composed of a large quantity of orderly arrayed nano-rods and the size of the nano-rods is close to the debye length; the air-sensitive characteristic is excellent; and the hierarchical hollow cubic stannic oxide nanometer particle has a potential application value in the field of air-sensitive sensors.

Techniques are disclosed for methods and apparatuses for performing continuous-flow plasma enhanced atomic layer deposition (PEALD). Plasma gas, containing one or more component gases, is continuously flowed to a planar inductive coupled plasma source attached at an upper end of a cylindrical chamber. Plasma is separated from the ALD volume surrounding a wafer / substrate in the lower end of the chamber by a combination of a grounded metal plate and a ceramic plate. Each plate has a number of mutually aligned holes. The ceramic plate has holes with a diameter less than 2 Debye lengths and has a large aspect ratio. This prevents damaging plasma flux from entering the ALD volume into which a gaseous metal precursor is also pulsed. The self-limiting ALD reaction involving the heated substrate, the excited neutrals from the plasma gas, and the metal precursor produce an ultra-uniform, high quality film on the wafer. A batch configuration to simultaneously coat multiple wafers is also disclosed.

A method of sensing biomolecules in an electrolyte solution by using a bio FET. When it is sensed that probe biomolecules are immobilized to a gate surface of the bio FET or that the probe biomolecules are hybridized with target biomolecules, a Debye length from the biomolecules having charges attached to the gate surface is controlled.

A method of generating a signal representing with an ion energy analyzer for use in determining an ion energy distribution of a plasma. The ion energy analyzer, used for determining an ion energy distribution of a plasma, includes a first grid and a second grid that is spaced away from and electrically isolated from the first grid. The first grid forms a first surface of the ion energy analyzer and is positioned to be exposed to the plasma. The first grid includes a first plurality of openings, which are dimensioned to be less than a Debye length for the plasma. A voltage source and an ion current meter are operably coupled to the second grid, the latter of which is configured to measure an ion flux onto the ion collector and to transmit a signal that represents the measured ion flux. The method includes selectively and variably biasing the second grid relative to the first grid.

An ion energy analyzer for determining an ion energy distribution of a plasma and comprising an entrance grid, a selection grid, and an ion collector. The entrance grid includes a first plurality of openings dimensioned to be less than a Debye length for the plasma. The ion collector is coupled to the entrance grid via a first voltage source. The selection grid is positioned between the entrance grid and the ion collector and is coupled to the entrance grid via a second voltage source. An ion current meter is coupled to the ion collector to measure an ion flux onto the ion collector and transmit a signal related thereto.

A sensor including a surface plasmon resonance detector with a reservoir for containing a liquid sample. The sensor further includes a sensing metallic film positioned within the reservoir so that at least a majority of a surface of the sensing metallic film is to be in contact with the liquid sample being housed within the reservoir. The sensory also includes a semiconductor device having a contact in electrical communication with the sensing metal containing film that is positioned within the reservoir. The semiconductor device measures the net charges of molecules within the liquid sample within a Debye length from the sensing metallic film.

Provided is a field effect transistor (FET) type biosensor including a source electrode, a gate, and a drain electrode. A ligand that can bind to a side of a nucleic acid is added to the surface of the gate. In a conventional FET type biosensor, it is difficult to detect a signal within the debye length because a target nucleic acid is directly fixed to the surface of a gate of the conventional FET. However, in the present invention, this problem can be overcome and the debye length can be increased by treating the surface of a gate of an FET sensor with a ligand that can bind to a side of a nucleic acid. The ligand can be adsorbed onto the surface of the gate. In this case, the nucleic acid is adsorbed parallel to the surface of the gate, not perpendicular to the surface of the gate, thus generating an effective depletion region. In addition, hybridization efficiency can be increased because a hybridized sample can be injected into an FET sensor at high ionic strength.

A sensor including a surface plasmon resonance detector with a reservoir for containing a liquid sample. The sensor further includes a sensing metallic film positioned within the reservoir so that at least a majority of a surface of the sensing metallic film is to be in contact with the liquid sample being housed within the reservoir. The sensory also includes a semiconductor device having a contact in electrical communication with the sensing metal containing film that is positioned within the reservoir. The semiconductor device measures the net charges of molecules within the liquid sample within a Debye length from the sensing metallic film.

Techniques are disclosed for methods and apparatuses for performing continuous-flow plasma enhanced atomic layer deposition (PEALD). Plasma gas, containing one or more component gases, is continuously flowed to a planar inductive coupled plasma source attached at an upper end of a cylindrical chamber. Plasma is separated from the ALD volume surrounding a wafer / substrate in the lower end of the chamber by a combination of a grounded metal plate and a ceramic plate. Each plate has a number of mutually aligned holes. The ceramic plate has holes with a diameter less than 2 Debye lengths and has a large aspect ratio. This prevents damaging plasma flux from entering the ALD volume into which a gaseous metal precursor is also pulsed. The self-limiting ALD reaction involving the heated substrate, the excited neutrals from the plasma gas, and the metal precursor produce an ultra-uniform, high quality film on the wafer. A batch configuration to simultaneously coat multiple wafers is also disclosed.

The systems and methods described herein include a sensor for suitable for sensing chemical and biological substances. The sensor comprises a semiconductor layer formed in or on a substrate and a channel having nano-scale dimensions formed in the semiconductor layer, where the structure creates an electrically conducting pathway between a first contact and a second contact on the semiconductor layer. In certain preferred embodiments, the nano-scale channel has a trapezoidal cross-section with an effective width and exposed lateral faces, where the effective width is selected to have same order of magnitude as a Debye length (LD) of the semiconductor material of which the semiconductor layer is formed.

Systems and methods for presenting nucleic acid molecules for analysis are provided. The nucleic acid molecules have a central portion that is contained within a nanoslit. The nanoslit contains an ionic buffer. The nucleic acid molecule has a contour length that is greater than a nanoslit length of the nanoslit. An ionic strength of the ionic buffer and electrostatic or hydrodynamic properties of the nanoslit and the nucleic acid molecule combining to provide a summed Debye length that is greater than or equal to the smallest physical dimension of the nanoslit.

On an upper wall of a vacuum container opposing a sample electrode, a plasma-invasion prevention-and-electron beam introducing hole is installed which is communicated with an electron beam introducing tube, and is used for introducing an electron beam toward a substrate in the vacuum container, as well as for preventing invasion of plasma into the electron beam introducing tube. In this structure, supposing that the Debye length of the plasma is set to λd and that a thickness of the sheath is set to Sd, the electron beam introducing hole has a diameter D satisfying a following equation: D≦2λd+2Sd.

The invention relates to a DNA sensor and detection method based on graphene Hall effect. Specifically, the invention discloses a DNA sensor which comprises an insulating substrate and a graphene filmfixed on the insulating substrate. The graphene film has the characteristics that 1)the surface roughness of the graphene film is less than 1.5 nm; 2)the sheet resistance of the graphene film is lessthan 1000 ohm / sq; 3)The mobility of the graphene film is greater than 2000 cm 2 / V.s. The invention further discloses a detection method for DNA based on the sensor, which can realize no labeling, rapid detection and detection limit as high as 10-12M and is not affected by Debye length.

While performing plasma-enhanced chemical vapor deposition on a substrate by exposing the substrate in a vacuum to a flow of particles generated by a plasma, which particles react to form a passivation layer on the substrate, a grid is interposed between the plasma and the substrate, thereby reducing the flow of charged particles towards the substrate while conserving a flow of neutral particles. The grid is formed of metal wires that are crossed at a pitch that is less than two or three times the Debye length (λD) of the plasma used, at least at the beginning of deposition. The aging properties of semiconductor components made by such a method is thereby improved.

The invention relates to the technical field of biosensors, in particular to a method for adjusting the sensitivity of an FET biosensor. The method is specifically realized by adjusting the Debye length to enable the Debye length to be matched with the height of the nucleic acid aptamer. The inventor further deduces through a dielectric constant formula and a Debye length formula that the thickness of the passivation layer and / or the ionic strength of the solution during detection can be changed, so that the adjustment of the Debye length can be realized; finally, the conclusion is verified through a series of specific experimental cases and theoretical calculation of the influence of the effective charge quantity brought by the conformation change of the nucleic acid aptamer near the Debye length on the sensitivity of the nucleic acid aptamer-FET biosensor. The adjusting method provided by the invention is simple to operate and easy to implement.

The invention discloses an implicit particle simulation analysis method for atmospheric pressure micro-scale arc discharge kinetic characteristics, and the method specifically comprises the steps: 1, carrying out the uniform grid division of a calculation region, and placing a plurality of charged simulation particles with initial positions and speeds in each grid; step 2, calculating charge density and current density on each grid node; 3, electric potential and electric field distribution on each grid node is calculated; 4, calculating the stress of the charged simulation particles and updating the coordinates and speed of the charged simulation particles; 5, calculating a new speed after collision based on a collision theory; and step 6, taking the updated coordinates and speed as the coordinates and speed in the step 2, and repeatedly executing the steps 2-6 in a time step until a set number of iterations is reached. According to the method, the problem that simulation time consumption is remarkably increased due to the fact that the space-time step length must be small enough to distinguish the Debye length and the oscillation period of electrons in the existing simulation technology is solved.

In order to reduce the ageing and degeneration of the characteristics of a semiconductor device under high reverse bias and high temperature conditions, a polymer, such as polyimide, is taken as a passivation layer of the semiconductor device. According to the invention, the polymer material and the semiconductor device nanometer grain with distribution grain size of 4-8 debye length are mixed at a volume ratio of 15%-40% and are poured and formed into the passivation layer.

The invention relates to a preparation method for a hierarchical hollow cubic stannic oxide nanometer particle composed of ultrafine nano-rods and belongs to the technical field of nanometer material preparation. The method comprises the following steps: taking solid cubic zinc hydroxystannate as a precursor, covering a layer of stannic oxide nano-rods on the surface of the zinc hydroxystannate after the hydrothermal reaction for a period of time, and meanwhile, decomposing the inner zinc hydroxystannate, thereby acquiring the hierarchical hollow cubic stannic oxide nanometer particle composed of the ultrafine nano-rods in the shape similar to the shape of zinc hydroxystannate. Compared with the traditional template method, the preparation method has the advantages of low cost, few steps and simple operation; the prepared hollow stannic oxide nanometer particle has an obvious hierarchical structure and a mesoporous structure, is difficult to agglomerate, is excellent in crystallinity and is high in specific surface area; the hierarchical hollow cubic stannic oxide nanometer particle is composed of a large quantity of orderly arrayed nano-rods and the size of the nano-rods is close to the debye length; the air-sensitive characteristic is excellent; and the hierarchical hollow cubic stannic oxide nanometer particle has a potential application value in the field of air-sensitive sensors.

The present invention discloses a method for predicting the evolution of erosion morphology of an ion thruster grid, comprising: obtaining the size of a single-hole beam downstream of an accelerating grid through experimental measurement; selecting a pair of screen grids and an accelerating grid hole as objects of numerical simulation research; obtaining an initial plasma density upstream of the screen grid based on a relationship between beam current and plasma density upstream of the screen grid; obtaining a Debye length based on upstream plasma density calculation and selecting a size of a simulation grid; obtaining a neutral gas density at each grid node in a simulation area based on a neutral gas collision model; establishing a grid corrosion morphology evolution model, starting beam calculation, simulating and obtaining the single-hole beam size, performing feedback adjustment based on experimental values, and determining a final upstream ion density; processing the collision process between ions and the grid, starting corrosion calculation, and obtaining an accurate grid corrosion rate; reducing grid mass based on the corrosion rate, eliminating grid nodes, and realizing a change in the grid morphology.

The application discloses an implicit particle simulation analysis method for atmospheric pressure micro-scale arc discharge dynamics characteristics, and specifically comprises the following steps: step 1, uniformly dividing a calculation region into grids, and placing a plurality of charged simulation particles with initial positions and velocities in each grid; step 2, calculating charge density and current density on each grid node; step 3, calculating potential and electric field distribution on each grid node; step 4, calculating force on the charged simulation particles and updating coordinates and velocities of the charged simulation particles; step 5, calculating new velocities after collision based on collision theory; and step 6, taking the updated coordinates and velocities as the coordinates and velocities in step 2, and repeating steps 2-6 in a time step until a set iteration number is reached. The application solves the problem that in the prior art simulation technology, time and space steps must be small enough to distinguish Debye length and oscillation period of electrons, thereby significantly increasing simulation time.