170 results about "Particle array" patented technology

The invention discloses a manufacturing method of a tunable triangular metal nano particle array structure. The method comprises the following steps: (1) selecting a substrate with a suitable model according to the requirement of transmission wavelength, and carrying out cleaning and hydrophiling treatment on the substrate; (2) evenly self-assembling a layer of nano spheres on the surface of the substrate; (3) etching the manufactured self-assembling nano sphere layer by using a reaction ion etcher (RIE) process to change the size of gaps between adjacent nano spheres; (4) self-assembling etched nano spheres to serve as a mould, and filling metals in gaps between adjacent nano spheres; and (5) removing the nano sphere self-assembling layer by using a Lift off process to obtain an array chip in a metal nano structure. The manufactured chip in the metal nano structure has controllable optical property, can be applied to fields such as local surface plasma resonance (LSPR) sensing, surface enhanced Raman spectroscopy (SERS) and the like, and can realize rapid detection of biologic and chemical molecules.

The invention discloses a three-frequency band near-infrared absorber based on a semiconductor super-surface structure, and belongs to the field of metamaterials. The three-frequency band near-infrared absorber sequentially consists of a substrate, a metal film layer and a semiconductor super-surface structure layer from bottom to top, wherein the semiconductor super-surface structure layer consists of a semiconductor particle array and a semiconductor film layer. The three-frequency band near-infrared absorber based on the semiconductor super-surface structure has the advantages that by reasonably designing the geometric size and lattice cycle of the semiconductor super-surface structure layer, the electromagnetic wave which is transmitted into the structure surface is completely absorbed; the structure is simple, the near-infrared band absorbing is realized, and three absorbing peaks are provided; the electromagnetic wave absorbing power is made of the semiconductor material, so that the limitation of only production of single resonance absorbing peak by the single size of the traditional metal resonance unit is overcome, and the absorber is applied into the fields of photoelectrical detection, photoelectrical conversion, production and collection of photo-induced electrons and thermal electrons, absorbing of electromagnetic energy, and the like.

The invention provides a preparation method of a surface-enhanced Raman scattering substrate of a metal particle array. The preparation method comprises the following steps of: preparing a porous silicon nanometer wire array (PSNWA) as a substrate material through a metal-assisted chemical corrosion method; reducing metal ions in a metal salt solution to elementary substance through an impregnation-reduction method, and obtaining the surface-enhanced Raman scattering substrate after uniformly depositing the elementary substance on the surface of the PSNWA in a nanometer particle manner; and inducing a substance to be detected into an active substrate surface through an infiltration or titration method, namely carrying out Raman spectrum detection. The preparation method provided by the invention has the advantages of low cost, simple process, simplicity and convenience in operation, high sensitivity of SERS (Surface-Enhanced Raman Scattering) signals, and good repeatability; and an SERS light spectrum has very good stability and repeatability. The invention provides a molecule detection and trace quantity analysis method with high speed, high sensitivity and high reliability. The preparation method provided by the invention needs extremely less sample amount, is suitable for various liquid samples, and has wide application prospects of rapid identification of clinical biological molecules, trace quantity chemical substance detection, biological sample analysis and the like.

The present invention provides a method for the generation of novel libraries of encoded magnetic particles from sub-libraries of by the generation of novel sub-libraries of magnetic nanoparticles and encoded particles. The sub-libraries are functionalized on demand are useful in the formation of arrays. The present invention is especially useful for performing multiplexed (parallel) assays for qualitative and / or quantitative analysis of binding interactions of a number of analyte molecules in a sample.

The invention provides an asymmetric Au particle array and FP cavity coupled refractive index sensor which comprises an insulation substrate, a metal film reflection layer, a transparent medium layer and a two-dimensional metal unit array, wherein at least one surface of the insulation substrate is polished; the metal film reflection layer is deposited on a polishing surface of the substrate; the transparent medium layer is deposited on the metal film reflection layer; the two-dimensional metal unit array is formed on the transparent medium layer, each metal unit in the two-dimensional metal unit array is an asymmetric unit, and is composed of two metal nano columns arranged along the surface of the substrate, and an F-P cavity loop is formed between the two metal nano columns of each metal unit and the metal film reflection layer just below the two metal nano columns. According to the asymmetric Au particle array and FP cavity coupled refractive index sensor, by combining an asymmetric Fano resonance effect and coupling an LSP mode and an FP cavity mode, the full width at half maximum of a resonance valley of the sensor can be reduced, and thus the performance of a local area surface plasma sensor is improved.

The invention provides a method for preparing a two-dimensional periodic metal particle array structure through dual-wavelength femtosecond lasers. The method and an implementation device for preparing the two-dimensional periodic particle array structure on the surface of metal by focusing two-color femtosecond laser pulses are provided. The method and the implementation device are characterized in that the metal particle structure is distributed in the two-dimensional direction in a periodic submicron dimension mode; two-color femtosecond lasers with different characteristic parameters are collinearly focused and irradiated on a sample after common channel or branch channel time delay through a nonlinear frequency doubling technology, and formed two-dimensional periodic structure patterns can be effectively adjusted and controlled by changing the azimuth angle of frequency doubling crystals and the power ratio of the two-color lasers. The method has the advantages that through the combinational design of different wavelengths and the polarization property of the femtosecond lasers, the submicron dimension two-dimensional periodic metal particle array structure can be conveniently and quickly prepared. The novel method for preparing the structure through the two-color femtosecond lasers has potential and important application value in the field of material micro-nano processing.

A method is provided for the preparation of nanoscale particle arrays having highly uniform crystals of metal, semiconductor or insulator materials grown in nanopores in the surface of a substrate, wherein the method uses pulse-reverse electrodeposition of metals with a rectangular or square waveform in order to generate high homogeneity of crystals and high in-plane or out-of-plane anisotropy in a controlled manner, enabling the creation of a variety of devices, including but not limited to high density storage media.

A method of producing a particle array is disclosed, comprising allowing monodisperse particles to be arrayed in an aqueous medium containing a monomer to form a colloidal crystal exhibiting a structural color and then polymerizing the monomer to form a polymer.

The invention relates to a method which is developed on the basis of the impacts of biological molecules on the single nanoparticle localized surface plasmon resonance effect and uses a localized surface plasmon resonance spectrum for detecting biological molecules, thereby solving the controllable preparation of the nanoparticle and eliminating non-specific absorption and parasitic light signalsduring the detection on the basis of positioning, orienteering, being coupled with a microfluidic system and optimizing a signal collection region in a micro-channel. The invention comprises the stepsof using the vapor deposition technology and the advanced preparation technology of micro-nano materials and structures to prepare the identifiable signal nanoparticle or a particle array in a micro-fluid, integrating the single nanoparticle or the particle array in the micro-channel, further modifying and functionalizing the surface thereof and using an optical signal generated by the impacts ofthe biological molecules on the nanoparticle localized surface plasmon resonance effect for detecting the type and the concentration of the biological molecules in the fluid. Therefore, a high-yieldsuper-sensitive chip-based biological molecule detector is constructed in the micro-channel.

The present invention relates to one kind of composite nanometer material in a core-shell structure including a dielectric core of nanometer SiO2 microsphere and a metal shell of Cu. The process of preparing the composite nanometer material includes: preparing colloidal SiO2 particle, self-assembling nanometer SiO2 sphere array on quartz chip, preparing composite SiO2 / Cu particle array, and ultrasonic separation to obtain nanometer SiO2 / Cu particle in a core-shell structure monodispersed inside solution. The composite nanometer material has surface plasma resonant absorption peak located in near infrared region, optical property in visible light and near infrared regions adjustable by means of controlling the diameter of the core and the thickness of the shell, blue shift with the increased shell thickness and red shift with increased SiO2 size. The nanometer material may find wide application in photocatalysis, sensor, optical information storing and other fields.

Fluid colloidal crystals comprising a solid-liquid dispersion electrostatically charged at not more than 2000 μS / cm in terms of an electrical conductivity, wherein the solid-liquid dispersion comprises, as a dispersoid, electrostatically chargeable spherical colloidal particles of an organic or inorganic polymer having a mean volume diameter (d) of not more than 30 μm, and as a dispersion medium, an aqueous solution or a dissolving water-containing non-aqueous solution, the dispersion concentration of the spherical colloidal particles is not more than 70%, around the dispersoid an electric double layer of a given thickness (Δe) is formed, and the spherical colloidal particles form a three-dimensionally ordered lattice that shows fluidity and is a particle array structure in which the colloidal particles are aligned longitudinally and laterally in a lattice form while an interparticle distance (L) defined as a distance between centers of the particles arranged opposite to each other along the center line satisfies the relationship (d)<(L)≦(d)+2(Δe). A process for producing a three-dimensionally ordered lattice, comprising drying the fluid colloidal crystals to form a three-dimensionally ordered lattice which is a homogeneous particle array structure constituted of the organic or inorganic monodisperse spherical fine particles of the dispersoid.

The present invention provides an apparatus for efficiently transporting or dispensing transport objects including not only particles but also liquid samples. A liquid in a first liquid transport pipe (3) is fed at a liquid feed velocity (V1), and a liquid droplet is formed toward an open end of a second liquid transport pipe (4) disposed with an air gap (11) in between. The particle is released into the liquid droplet, so that the particle is enclosed in the liquid droplet. Suction with a liquid feed velocity (V2) is applied to the inside of the second liquid transport pipe. Since the relationship between V1 and V2 is V1<V2, the liquid droplet, after reaching the open end (10) of the second liquid transport pipe, is sheared off by suction, thereby forming a liquid section in the second liquid transport pipe. Thus, the particle in the liquid section, held under surface tension on a gas-liquid phase boundary, can be transported into a particle array container with stability in conjunction with the liquid section.

The invention discloses a silver nm particle array template, which is prepared by a self assembling method. The average size of the silver nmo particles is 10 to 500 nm, and the density is 10 <8> to 10 <12> / cm <2>. The invention also discloses a preparation method of the silver nm particle array template, and the process steps are as follows: step one, a layer of uniform silver film is deposited on a base plate by using vacuum deposition film equipment; step two, discrete nm particles are formed to the deposit silver film through heat annealing process, therefore, the silver nm particle array template distributed at random can be prepared. The invention has the advantages that the silver template is prepared with the self assembling method, the average size of the silver nm particles is 10 to 500 nm, the density is 10 <8> to 10 <12> / cm <2>, and the size and the density of the nm particles can be controlled by the thickness of the silver film; the preparation method is simple, the operation is easy, and the cost is low; the silver template has the advantages of high density and random distribution, thereby being helpful to the design and the production of the device products of magnetic recording media, and flat field emitters and so on.

The process of preparing ordered hexagonal nanometer FePt particle array includes the following steps: 1. self-assembling inverse micelle with amphiphilic block copolymer PS-block-P2VP intoluene; 2. adding metal salts FeCl3 and H2PtCl6 into the inverse micelle solution through stirring for the metal salts FeCl3 and H2PtCl6 to be combined with the P2VP kernel of the inverse micelle to form inverse micelle with supported metal salts; 3. depositing the inverse micelle with supported metal salts onto smooth monocrystalline substrate through dip coating to obtain ordered hexagonal inverse micelle array; and 4. oxygen plasma etching to eliminate copolymer substrate and reduce metal salt into simple substance so as to obtain homogeneous ordered hexagonal nanometer FePt particle array on the monocrystalline substrate.

The invention belongs to the technical field of nano composite material synthesis, and particularly relates to a method for controllably preparing a composite nano pattern array. The method comprisesthe steps: sputtering an Ag film on the surface of an ordered nano patterned structure template to form an Ag nano cap array and an Ag nano triangular array; inversely transferring the Ag nano cap array to another Si substrate to obtain a secondary template; completely etching PS spheres to obtain an Ag nano-bowl array; etching the PS spheres for different time periods, and sputtering and depositing a TiO2 film on the surface of each PS sphere to obtain an Ag-TiO2-FON array, an Ag-TiO2 nanocap-Star array and an Ag-TiO2 nanoring-particle array. According to the invention, the defects of tediousconstruction steps, low orderliness and density, long preparation period, high cost, rigorous test condition requirements and the like of the ordered nanostructure active substrate in the prior art are overcome, so that the method has the advantages of good uniformity, high orderliness, high repeatability, simple construction steps, short preparation period and low cost.

This invention relates to a preparation method for carbon nanotube. Said method comprises providing a substrate having a surface, forming a catalyst particles array, a electrode opposite to the array and a groove on the surface of the substrate, wherein the array and the electrode are on both sides of the position opposite to the groove, inputting current to the electrode and forming magnetic field, growing carbon nanotubes on the catalyst particles array along the direction to the electrode. This invention also provide a device for carbon nanotube preparation. Carbon nanotubes with uniform length can be prepared by the method and the device.

The invention discloses a gold@metal organic frame material nano-particle array and a preparation method and application thereof.The gold@metal organic frame material nano-particle array is an ordered array formed by arranging multiple nano-units according to a non-closely-arranged hexagonal structure, the distance between every two adjacent nano-units ranges from 350 nm to 1000 nm, and each nano-unit is of a core-shell structure with gold nano-particles as the core and a metal organic frame material MIL-100 (Fe) as the shell.According to the gold@metal organic frame material nano-particle array, the properties of the metal organic frame material and the gold nano-particles can be effectively exerted; besides, stability is good, and particle aggregation can be avoided.

The invention relates to a nano particle precise order assembling method. Firstly, an optical etching method is used for conducting surface etching on a hardness board, a columnar array structure is obtained with order arrangement is obtained from the surface of the hardness board, the board which is of the columnar array structure and provided with the order arrangement on the surface and a board with the flat surface serve as a lower base and an upper base respectively, suspension liquid containing nano particles is filled between the board which serves as the lower base, is provided with the order arrangement on the surface and is of the columnar array structure and the board which serves as the upper base and is provided with the flat surface to form a sandwich interlayer structure, after solvent in the suspension liquid is volatilized, the upper base and the lower base are separated, and a nano particle array which is precisely assembled is obtained from the board with the flat surface. The nano particle array prepared by the nano particle precise order assembling method can achieve precise assembling of the nano particles at the specific position, and in addition, the prepared nano particle array has potential application value in microelectronic circuits, optical elements and magnetic devices.

An object of the present invention is to provide a method of forming fine particles on a substrate in which reoxidization of reduced fine particles is suppressed. Reduced fine particles (FeO fine particles) are formed by embedding metal oxide fine particles (Fe2O3 fine particles) fixed on a p type silicon semiconductor substrate into a silicon oxidized film, and carrying out a heat treatment in a reducing gas atmosphere. Presence of the silicon oxidized film enables suppression of reoxidization of the reduced fine particles (FeO fine particles) due to exposure to the ambient air.

The invention provides a liquid-liquid interface detection method for surface-enhanced Raman spectroscopy. The method comprises: first, preparing an oil phase solution containing acetone and noble metal nano sol respectively; dissolving a to-be-detected substance in the oil phase solution or noble metal nano sol; then mixing the oil phase solution and the noble metal nano sol to form a liquid-liquid two-phase interface; and finally, detecting target molecules in the to-be-detected substance by a Raman spectrometer by utilizing a noble metal nano-particle array self-assembled on the liquid-liquid interface as an active substrate for Raman scattering. The method provided by the invention uses an insoluble liquid-liquid two-phase interface self-assembled noble metal nano-particle array as theRaman scattering active substrate for detection, can be used for single-phase or two-phase, single-component or multi-component detection of water-soluble / oil-soluble substances to be detected, breaks the bottleneck of detection of substances to be detected with different solubility in complex samples, and realizes high-throughput quantitative detection.

The invention discloses a making method for a molybdenum oxide nano-fiber paper hydrogen sensor. According to the making method, a metal Pt / Pd nano-particle array is sputtered on one side face of molybdenum oxide nano-fiber paper prepared on the basis of the patent of molybdenum oxide nano-fiber paper and a making method thereof (201510308204.6). The making method comprises the steps that the molybdenum oxide nano-fiber paper is coated with a metal mask plate, the Pt / Pd nano-particle array is sputtered in magnetic control vacuum sputtering equipment to form an electrode, the nano-fiber paper subjected to sputtering is cut from the middle to form two hydrogen-sensitive elements identical in performance, and the hydrogen-sensitive elements are encapsulated into an IC base to form the finished hydrogen sensor. Sensors different in response time and recovery time can be prepared according to different nano-particles, sputtering time and sputtering power. The sensor making process is simple and low in energy consumption and cost; work can be done at a normal temperature, response time and recovery time are short, sensitivity is high, stability is good, service life is long, repeatable utilization can be achieved, and the hydrogen-sensitive elements can be conveniently integrated in various multi-path sensors.

The invention discloses a tunable all-dielectric unidirectional electromagnetic wave stealth device, comprising a dielectric particle array with a high dielectric constant and a temperature control system, wherein the dielectric particle array with the high dielectric constant comprises a plurality of cuboid unit lattices with the same geometrical size, and cuboid dielectric particles are arranged in each lattice of the plurality of cuboid unit lattices; and the temperature control system is used for controlling the ambient temperature of the environment in which the stealth device is located so as to change the dielectric constant of the dielectric particles, and thus the frequency characteristic curve of the stealth device can be moved. According to the tunable all-dielectric unidirectional electromagnetic wave stealth device disclosed by the invention, the frequency characteristic curve of the device can be moved by adjusting the temperature, the stealth of the electromagnetic waves at different frequency bands can be achieved, and the applicability of the device can be improved; and the device is simple and easy to implement.

The invention provides a particle spacing control method for an ordered precious metal nano-particle array. The method comprises the following steps that 1, a carrier is implanted into an initial ordered precious metal nano-particle single-layer array through an organic solution with dispersed precious metal precursor / diblock copolymer micelle in a dip-coating mode; 2, implanting is conducted multiple times on the carrier loaded with the initial array according to the process in the step 1, and finally the ordered precious metal nano-particle array meeting the target particle spacing is obtained. Accordingly, by means of the positioning and dispersing mechanism of the spherical micelle in the multi-time implanting process, the problem that particle spacing design cannot be achieved througha single diblock copolymer template is solved. According to the discovery and technology, the controllable range of the spacing is determined, precise design and adjustment of the center distance ofthe adjacent particles of all kinds of single-layer precious metal nano-particle ordered arrays are achieved, and a material preparation method and technology are provided for optimizing the catalyticperformance, optical performance, electrical performance and other performances closely related to the spacing with the particles or density.

The invention relates to a glucose SERS detection substrate based on a Ag@Ag nanodot hierarchical galaxy array and a preparation method thereof. The glucose SERS detection substrate is prepared by depositing on the surface of a silicon substrate the Ag@Ag nanodot hierarchical galaxy array containing a two-stage structure composed of a silver nanodot mother particle array and a silver nanodot son particle array. Silver nanodot mother particles have diameters in a range of 91 to 97 nm; silver nanodot son particles on and around the silver nanodot mother particles have diameters in a range of 3 to 12 nm; and the center distance of adjacent silver nanodot mother particles is in a range of 98 to 102 nm. The glucose SERS detection substrate based on the Ag@Ag nanodot hierarchical galaxy array is controllable in structure, high in the coupling degree of galaxy structures, substantially improved in Raman signals and uniform and stable in enhancing signals; and SERS test results show that the glucose SERS detection substrate strongly responds to glucose concentration. The method provided by the invention realizes flexible regulation and control of the sizes of the mother particles and the son particles, can more easily realize large-scale, high-sensitivity and low-cost preparation and is capable of realizing performance advantages of the SERS substrate in biological detection of glucose and the like.