36 results about "Extinction spectrum" patented technology

A provided method for measuring key geometrical characteristics of nanometer particles comprises the following steps: loading the nanometer particles on a sample pool to obtain an extinction spectrum of the nanometer particles; arranging a mixed solution containing the nanometer particles in a referential sample pool and the sample pool for measuring to obtain a scattered spectrum of the nanometer particles; changing the concentration and the optical path length of metal nanometer particles, repeating the above steps, exporting measured data according with a linear response zone; pre-estimating the kinds of the key geometrical characteristics contained by the nanometer particles and the geometrical scale distribution scope; establishing databases of the relationship about the key geometrical characteristics with the extinction section coefficient and with the scattering cross-section coefficient; respectively converting the databases of the relationship about the key geometrical characteristics with the extinction cross-section coefficient and with the scattering section coefficient into matrixes, and converting the inverse problem into a linear equation group; and solving according to the databases of the extinction spectrum, the scattered spectrum and the extinction cross-section coefficient and the database of the scattering cross-section coefficient, to obtain the key geometrical characteristics of the nanometer particles.

Methods, systems and computer readable media for computing small particle size distributions of particles in a process stream comprising a sample dilute colloid. A reference matrix of pre-computed reference vectors is provided. Each reference vector represents a discrete particle size or particle size range of a particle size distribution of particles contained in a dilute colloid. Each reference vector represents a reference extinction spectrum over a predetermined wavelength range. A measurement vector representing a measured extinction spectrum of the sample particles in the sample colloid is provided, wherein the measured extinction spectrum has been spectrophotometrically measured over the wavelength range. The particle size distribution and particle concentrations of the particles in the sample colloid are determined using the reference matrix, the measurement vector and linear equations.

The invention relates to a preparation method of silver nanoparticle lattice with a wide plasmon resonant frequency regulation range. The method comprises the following steps: (a) covering an organic film on a substrate, fixing the substrate on a rotatable substrate holder with a light hole; (b) installing the substrate holder in a high vacuum settling chamber to ensure that the substrate on the substrate holder is in the center of the beam; (c) adopting the gas phase aggregation method to cluster a beam source and generate silver nanoparticles, using a nozzle to form a silver nanoparticle beam with high directionality and accurately controlled equivalent deposition rate; and (d) using the silver nanoparticle beam to deposit on the substrate, and accurately controlling the deposition of the nanoparticles to control the coverage of the silver nanoparticles on the substrate to be 5%-78%. Therefore, the interplanar distance of the deposited silver nanoparticles can be controlled, the plasmon resonant frequency can evolve continuously, and the changes of the plasmon resonant frequency is monitored through the in-situ extinction spectrum. The method of the invention is characterized in that the technology is simple, the cost is low, the regulation precision of the plasmon resonant frequency is high, the continuous regulation in the wide range is easy to realize, etc.

The invention relates to a waveguide coupling metal photonic crystal biosensor and a detecting method thereof, which are used for the high-sensitivity sensation of biomolecule concentration and bioactive molecule idiosyncrasy. The waveguide coupling metal photonic crystal biosensor comprises a base, a waveguide layer and metal photonic crystals arranged on the waveguide layer. When the waveguide coupling metal photonic crystal biosensor is used for detecting, light transmitted by a light source irradiates the metal photonic crystals at an angle, and an optical detector is used for detecting an extinction spectrum of transmitted light passing through the waveguide layer and the base or detecting an extinction spectrum of transmitted light passing through the metal photonic crystals; after receptors are fixed on the metal photonic crystals, a sample solution flows through the surfaces of the metal photonic crystals, the detector is used for detecting the extinction spectrum of the transmitted light which passes through the waveguide layer and the base at the moment or detecting the extinction spectrum of the transmitted light which passes through the metal photonic crystals, and the two extinction spectrums are calculated by secondary extinction spectrums to quantificationally detect ligand concentration. The waveguide coupling metal photonic crystal biosensor has high sensitivity, low cost, simple preparation, simple use method, and the like.

The invention provides an electric in-situ buckle background method for graphene plasmon reinforcing infrared spectroscopy detection. The method comprises the following steps: 1) preparing an infrared reinforcing and detecting device for a graphene plasmon component; 2) putting a to-be-detected object onto a graphene micro-structure; 3) performing an electrical test on the graphene micro-structure: measuring an Ids-Vg transport curve of graphene and reading a voltage Vg(CNP) corresponding to a Dirac point of the graphene; 4) performing infrared signal detection by utilizing the in-situ buckle background method, comprising the following sub-steps: a) by taking the voltage Vg(CNP) as the detecting background, collecting an extinction spectrum T (CNP); and b) adjusting the voltage Vg, reinforcing sample signals at various degrees by utilizing positive and negative voltages above or below the Dirac point, collecting the extinction spectrum T (EF) again, and confirming the step length of the voltage Vg according to the natures and specific measured scopes of different dielectric layer materials.

The invention provides a spectrum measuring method. The spectrum measuring method comprises the following steps of calibrating a spectrum measuring system, measuring the transmittance of samples to be measured, computing an extinction spectrum of the samples to be measured, measuring the samples to be measured after loading the samples to be measured in a reference sample pool or a sample pool, converting the samples to be measured in the reference sample pool or the sample pool into standard samples, calibrating the reflectivity of a second reflection lens, the reflectivity of a third reflection lens, the distance r between the samples to be measured and a photoelectric detecting and processing unit, and the transmittance of a attenuation slice, and computing and obtaining the scattered spectrum of positions near 90 degrees of the samples to be measured.

A staphylococcal enterotoxin detection method is characterized in that the detection method comprises the steps as follows: (1) preparing an LSPR detection chip of staphylococcal enterotoxin; (2) activating the surface of the metal structure of the chip to form a specific biological molecular membrane; (3) testing the extinction spectrum of the chip to obtain a reference value before combination; and (4) dripping a to-be-detected sample, putting the sample in an LSPR sensor for detection after the full reaction of the sample, observing spectral shift condition by using the specific reaction among antigen-antibody molecules, and judging whether the to-be-detected sample contains staphylococcal enterotoxin, so as to realize fast detection with high sensitivity and without a label. The method does not need complex equipment and does not use radioactive isotope, enzyme or fluorescence and the like as a label, and has the remarkable characteristics of quickness, high sensitivity, wide application range, security and high stability. The method provides a simple and practical new method for the quick detection of staphylococcal enterotoxin.

The invention relates to a water quality multi-parameter ultraviolet-visible absorption spectrum quantitative inversion method, which comprises the steps of 1, selecting an original absorption spectrum 0A320-750 of a water sample of a waveband of 320-750nm, and carrying out analysis by using a partial least squares (PLS) method to obtain water turbidity; 2, calculating a turbidity extinction spectrum 1B200-320 of the waveband of 200-320nm by utilizing the original absorption spectrum 0A320-750 of the water sample of the waveband of 320-750nm and a Mie scattering correction method; subtractingthe turbidity extinction spectrum from the original absorption spectrum of the waveband to obtain an absorption spectrum 1A200-320 after turbidity compensation; 3, selecting an absorption spectrum 1A260-320 subjected to turbidity compensation at the waveband of 260-320nm, and analyzing by utilizing the partial least squares (PLS) method to obtain a COD concentration analysis result; 4, normalizinga COD absorption spectrum and the COD analysis result by utilizing the concentration, calculating a COD compensation spectrum 2B200-260 of the waveband of 200-260nm, and subtracting the COD compensation spectrum 2B200-260 from the absorption spectrum 1A200-260 after turbidity compensation of the waveband to obtain the turbidity and an absorption spectrum 2A200-260 after COD compensation; and 5, selecting 200-260nm turbidity and the absorption spectrum 2A200-260 after COD compensation, and analyzing by using the partial least squares (PLS) method to obtain the nitrate concentration.

The invention discloses a method that detects Staphylococcus aureus enterotoxin by a composite nano metal structure, which comprises the following steps: (1) a substrate is chosen and cleaned, and a polystyrene nano-sphere layer is self-assembled on the substrate; (2) the produced self-assembled polystyrene nano-sphere layer is taken as a die, and a silver film and a gold film are vapor-deposited on the self-assembled layer through a vapor deposition method; (3) the self-assembled polystyrene nano-sphere layer is removed through a Lift-off technique, and the nano metal array structure is obtained after array transformation; (4) the nano metal layer is activated by adopting a non-directional covalent connection method, and a biological molecular film layer that resists SE sheep monoclonal antibodies IgG is formed on the surface of the nano metal structure; (5) extinction spectrum of the nano metal structure is extracted by a spectrograph, and an extinction spectrum peak before the biological combination is obtained; (6) a solution to be detected is dropped on the substrate surface and blow-dried after the reaction, and step (5) is repeated; (7) the extinction spectrum peaks that are obtained before and after step (6) are contrasted, thus determining whether the solution to be detected contains SE. The method that detects the Staphylococcus aureus enterotoxin with the composite nano metal structure does not need the purifying and the marking of the solution to be detected, and can be applied into the quick detection of SE or other toxins in the same type.

A composition includes a first population of strongly plasmonic nanorods and a second population of strongly plasmonic nanorods. The two populations each have a size range of the nanorods, creating a size range gap between the two populations. This size range gap creates a transparency window that can be seen in an extinction spectrum of the composition, which is characterized by the sizes of the nanorods in both populations. The composition may be included in a filter providing a transparency to a defined wavelength characterized by the size range gap of the nanorods.

The invention discloses a method for sensing organic gas, which is characterized by comprising the following steps: selecting a sensing chip substrate with an appropriate model according to the need of the transmission wavelength, and cleaning and drying the substrate; producing a metal nanometer structure array on the substrate to obtain a sensing chip; combining a layer of gas sensitive film on the metal nanometer structure array according to the variety of gas to be detected; utilizing a light source to irradiate the sensing chip after certain organic gas is absorbed, and then using a spectrum tester to probe transmitted light to obtain an extinction spectrum; and analyzing the extinction spectrum to obtain concentration information of the gas. The method for sensing the organic gas has the advantages of convenience, easiness, quick response speed, low cost and the like, and can be used in aspects such as environmental detection, explosive detection, food security and the like.

The invention provides a spectral-line peak-value separation method employing graphene plasmons-enhanced infrared spectroscopy detection. The method comprises (1) preparing an infrared enhancing and detection device for a graphene plasmons component; 2) putting a to-be-detected object on graphene microstructure; 3) performing electrical test on the graphene microstructure, concretely, measuring the Ids-Vg transportation curve of graphene, and reading the voltage Vg(CNP) corresponding to the Dirac point of graphene; 4) separating the infrared detection spectral-line peak value by adjusting the grid voltage, and concretely comprising the following steps: a) acquiring the extinction spectrum T (CNP) under the voltage Vg (CNP) corresponding to the Dirac point of graphene, and taking as a background; b) after background acquisition is finished, adjusting the grid voltage Vg to the grid voltage Vg to deviate from the voltage corresponding to the Dirac point of graphene, then acquiring signals of the sample under different voltages, then acquiring the extinction spectrum T (EF) again, and gradually increasing the step length of Vg, so as to enable a peak covered in an intrinsic signal to emerge.

The invention relates to an enhancement method for visible light emission of ZnS doping level of quantum dots doped with transition metal elements. The method comprises the steps that ZnS doped Mn quantum dots are prepared by a sol-gel method; a metal nanostructure is evaporated on a Si wafer through a vacuum evaporation technology; a Ti / Ag nanostructure with two bow tie types is prepared throughelectron beam etching; a layer of SiO2 material is deposited on the surface of a metal nanomaterial through vapor-phase evaporation, and the thickness of the SiO2 material is 2 to 3nm; and the prepared ZnS quantum dots are spin coated on the surface of a nano-island film structure. According to the invention, in experiments, the ZnS quantum dots doped with Mn elements are prepared; through the regulation of the size and shape of nanometals and the relative position between particles, the extinction spectrum and the doping level of the ZnS quantum dots are in the strongest resonance coupling effect; and by annealing the metal island film at 120 DEG C for 30 minutes, the strongest luminescence of the ZnS doping level caused by the plasmon resonance of metal nanoparticles is acquired.

The invention belongs to the technical field of thin film solar cells, and discloses a manufacturing method for an Ag / Al core shell composite nanometer particle light trapping structure of a thin film solar cell. The Ag / Al core shell composite nanometer particle light trapping structure is manufactured through a method of combining magnetron sputtering and in situ annealing, and the magnetron sputtering method for manufacturing metal nanometer particles is simple, easy to conduct and good in repeatability. Therefore, Ag / Al core shell composite nanometer particles with different appearances, different core shell sizes and different surface coverage rates are manufactured easily by changing process parameters such as the thickness of a thin film and annealing temperature. By changing the process parameters, the optical performance of the nanometer particles can be effectively adjusted, and the extinction spectrum peak of the nanometer particles is widened. The extinction peak position of the nanometers is adjustable within the range of 350-700 mm, extinction spectrum half-width is obviously widened, and the photovoltaic conversion efficiency of the solar cell can be largely improved when the manometer particles are used for manufacturing the light trapping structure of the amorphous silicon thin film solar cell.

The invention discloses a fiber composition detection method of a textile by a short-wave infrared extinction spectrum. The detection method aims at achieving quick, convenient and nondestructive fiber composition content detection of the textile. The fiber composition content detection method of the textile comprises the following steps of: (1) collecting a standard textile sample and establishing a complete textile sample database, (2) measuring an extinction spectrum of the standard textile sample, (3) establishing a fiber composition forecast model by stages, (4) measuring an extinction spectrum of a textile sample to be detected, and (5) forecasting a fiber composition of the textile sample to be detected according to the established fiber composition forecast model in step (3) to obtain the fiber composition of the textile sample to be detected. The fiber composition detection method of the textile by the short-wave infrared extinction spectrum can greatly reduce the complexity and improve the efficiency of fiber composition detection of the textile and achieves the quick, convenient and nondestructive detection.

The invention discloses a noble metal nano-array extinction spectrum measuring device and a sensing detection method thereof. The noble metal nano-array extinction spectrum measuring device comprisesa white light source, a light beam lifter, a microscopic assembly, a sample fixture, an optical signal sampler, a spectrometer and a computer terminal. The light beam emitted from the white light source change the propagation path by the light beam lifter to incident to the microscopic assembly, the focused light beam emitted from the microscopic assembly incident to a sample to be detected, the focused light beam subjected to transmission by the sample to be detected is received by the optical signal sampler and is transferred to the spectrometer, the spectral signal output from the spectrometer is transferred to the computer terminal, the concentration of organic solution can be calculated by the computer terminal according to the extinction peak position change of the extinction spectrum of the sample detected which is relative to the extinction spectrum of the noble metal nano-array. The noble metal nano-array extinction spectrum measuring device can realize the accurate position measurement for extinction spectrum of the noble metal nano-array with a complex structure and a micrometer grade size and has the following advantages that the concentration detection process is simple, the cost is low, and the sensitivity is high.

The invention relates to the field of biochemical detection, in particular to an organophosphorus detection method based on LSPR (localized surface plasma resonance). According to the method, an organophosphorus sample is sufficiently contacted with an acetyl-cholinesterase immobilized sensing chip, and an organophosphorus inhibiting enzyme film is formed on the surface of the sensing chip; the sensing chip containing the organophosphorus inhibiting enzyme film is immersed into a mixed solution of acetylthiocholine and chloroauric acid for a sufficient reaction, and gold nanoparticles are formed on the surface of the sensing chip; the sensing chip containing the gold nanoparticles is irradiated by visible light or infrared light, and an extinction spectrum of transmission light is measured, and an LSPR spectrum is acquired; the LSPR spectrum is compared with a standard LSPR spectrum, whether the organophosphorus sample contains organophosphorus is determined according to deviation of absorption peak; the concentration of the organophosphorus is determined according to displacement of the absorption peak. Metal nanoparticles are not required to be prepared before the acetyl-cholinesterase film is immobilized, the detection process is simplified, and low cost is realized.

A spectrometer apparatus (1) is provided for measuring spectra of a liquid sample, such as a beverage such as wine. The apparatus (1) comprises an integrating cavity (3) comprising a reflective inner wall or walls (5), configured to receive a cuvette (7) containing the liquid sample within the integrating cavity (5). A combination of light inlet ports P1, P2 and light outlet ports P3, P4 are provided to receive light from at least one light source (9) and to deliver light to a spectrometer (11). A light path adjuster (13, 13B) is configured to selectively adjust a light path through the integrating cavity (5) such that at least two distinct light paths are provided; wherein when the light path adjuster (13, 13B) is in a first configuration, the apparatus (1) is in a transmission mode in which light from the light source follows a first light path (15) from the or one of the light inlet port(s) to the liquid sample such that the light from the light source irradiates the liquid sample directly before the light transmitted by the sample is transmitted through the or one of the light outlet port(s) and received by the spectrometer (11) for wavelength analysis of the light to provide an extinction spectrum of the liquid sample; and when the light path adjuster (13, 13B) is in a second configuration, the apparatus is in a diffusely reflecting mode in which light from the light source follows a second light path (17) from the or one of the inlet port(s) into the integrating cavity, is incident onto the reflective inner wall or walls of the integrating cavity and is diffusely reflected within the integrating cavity, such that the light from the light source irradiates the liquid sample before being transmitted through the or one of the light outlet port(s) and received by the spectrometer (11) for wavelength analysis of the light to provide an absorbance spectrum of the liquid sample contained in the liquid sample.

The invention discloses a method that detects Staphylococcus aureus enterotoxin by a composite nano metal structure, which comprises the following steps: (1) a substrate is chosen and cleaned, and a polystyrene nano-sphere layer is self-assembled on the substrate; (2) the produced self-assembled polystyrene nano-sphere layer is taken as a die, and a silver film and a gold film are vapor-depositedon the self-assembled layer through a vapor deposition method; (3) the self-assembled polystyrene nano-sphere layer is removed through a Lift-off technique, and the nano metal array structure is obtained after array transformation; (4) the nano metal layer is activated by adopting a non-directional covalent connection method, and a biological molecular film layer that resists SE sheep monoclonal antibodies IgG is formed on the surface of the nano metal structure; (5) extinction spectrum of the nano metal structure is extracted by a spectrograph, and an extinction spectrum peak before the biological combination is obtained; (6) a solution to be detected is dropped on the substrate surface and blow-dried after the reaction, and step (5) is repeated; (7) the extinction spectrum peaks that are obtained before and after step (6) are contrasted, thus determining whether the solution to be detected contains SE. The method that detects the Staphylococcus aureus enterotoxin with the composite nano metal structure does not need the purifying and the marking of the solution to be detected, and can be applied into the quick detection of SE or other toxins in the same type.

The fabrication of asymmetric monometallic nanocrystals with novel properties for plasmonics, nanophotonics and nanoelectronics. Asymmetric monometallic plasmonic nanocrystals are of both fundamental synthetic challenge and practical significance. In an example, a thiol-ligand mediated growth strategy that enables the synthesis of unprecedented Au Nanorod-Au Nanoparticle (AuNR-AuNP) dimers from pre-synthesized AuNR seeds. Using high-resolution electron microscopy and tomography, crystal structure and three-dimensional morphology of the dimer, as well as the growth pathway of the AuNP on the AuNR seed, was investigated for this example. The dimer exhibits an extraordinary broadband optical extinction spectrum spanning the UV, visible, and near infrared regions (300-1300 nm). This unexpected property makes the AuNR-AuNP dimer example useful for many nanophotonic applications. In two experiments, the dimer example was tested as a surface-enhanced Raman scattering (SERS) substrate and a solar light harvester for photothermal conversion, in comparison with the mixture of AuNR and AuNP. In the SERS experiment, the dimer example showed an enhancement factor about 10 times higher than that of the mixture, when the excitation wavelength (660 nm) was off the two surface plasmon resonance (SPR) bands of the mixture. In the photothermal conversion experiment under simulated sunlight illumination, the dimer example exhibited an energy conversion efficiency about 1.4 times as high as that of the mixture.

Disclosed is a method of pulsed laser ablation production of gold-platinum AuxPt1-x alloy nanoparticles in a colloidal solution. The colloidal solution of AuxPt1-x alloy nanoparticles is suitable for many biological applications including lateral flow immunoassays and other bio-detections based on optical scattering. The nanoparticles form by fragmentation of the bulk material without evaporation, minimizing oxidation of the nanoparticles. The nanoparticles conjugate with bio-molecules such as protein, antibodies, peptides, RNA oligomers, DNA oligomers, other oligomers, or polymers effectively by passive adsorption. Advantageously the AuxPt1-x alloy nanoparticles have a wide optical extinction spectrum in the visible region, appearing nearly black in both colloidal and dried form. The nanoparticles can be used for labeling bio-molecules and provide a high visual contrast in visual-based bioassays. A combination of the near black color of the AuxPt1-x alloy nanoparticles with the red color of pure Au nanoparticles makes multiplexing bio-detection assays possible.

The invention discloses a symmetrical bow-shaped flexible metasurface sensor for biological cancer cell detection and application, the sensor comprises a substrate, symmetrical metal bow-shaped rings are etched on the substrate, and the substrate and the surface symmetrical metal bow-shaped rings form the metasurface sensor. Terahertz time-domain spectroscopy is used for testing a time-domain signal of the metasurface sensor, inner product operation is carried out on a Moire wavelet function and the time-domain signal obtained through testing through matlab programming, the Moire wavelet function is transversely translated to obtain time-domain information, the Moire wavelet function is longitudinally stretched to obtain frequency-domain information, and wavelet coefficients are extracted to obtain extinction spectrum intensity. And two-dimensional visual output of different concentrations and different biological samples which change in the time domain and the frequency domain at the same time is achieved by using a wavelet coefficient obtained by the inner product of the Moire wavelet function and the time domain signal. According to the invention, two-dimensional visual output of different biological samples with different concentrations is realized at the same time, multi-performance detection of the metasurface sensor is realized, and the limitation that the resolution of a flow cytometer is zero is broken through.