146results about How to "Improve Sensing Performance" patented technology

The invention discloses a CDs / QDs (at) ZIF-8 probe, a preparation method of the CDs / QDs (at) ZIF-8 probe and application of the CDs / QDs (at) ZIF-8 probe to detection of tetracycline at three emission ratios, and belongs to the technical field of fluorescence sensing. The probe comprises ZIF-8 as well as a carbon dot and a cadmium telluride quantum dot which are encapsulated in the ZIF-8. The preparation method comprises the following steps: sequentially adding CDs and QDs into a 2-methylimidazole solution, uniformly mixing, dropwise adding a zinc salt solution, and reacting to obtain the CDs / QDs ZIF-8 probe. The probe can be used for performing three-emission-ratio fluorescent quantitative detection on tetracycline, and the detection limit is 14.2 nmol / L. The method is simple in synthesis steps and easy in condition control. The fluorescent color of the mixed solution of CDs / QDs ZIF-8 and tetracycline is changed from powder to green along with the increase of the concentration of tetracycline, the detection method is visual and rapid, the visualization effect is good, the detection gel can be prepared, the detection gel can be combined with a smartphone for use, and the method is simple, convenient to carry and convenient for field judgment.

The invention provides a self-repairing and self-adhering nano composite hydrogel material as well as a preparation method and application thereof. The self-repairing and self-adhering nano composite hydrogel material provided by the invention comprises a boric acid derivative modified first monomer, a second monomer and a conductive filler. A macromolecular network formed by the two monomers generates crosslinking through reversible interaction so as to improve the mechanical strength of the hydrogel, and meanwhile, the hydrogel is endowed with reliable self-repairing performance; in addition, a macromolecular chain of the hydrogel contains more free active groups, and the hydrogel can be adhered to materials such as skin through reversible interaction among the groups. The doping of the conductive filler is also beneficial to improving the mechanical property, the conductivity and the sensing property of the hydrogel, so that a flexible wearable sensor assembled by the hydrogel can sensitively and stably monitor a human body motion signal and an electrophysiological signal.

The invention discloses a terahertz sensor based on graphene Fano resonance and a regulation and control method and application thereof, and relates to the technical field of sensing devices, the terahertz sensor comprises a substrate layer, a dielectric layer and a graphene layer, the graphene layer comprises at least one unit structure arranged on the dielectric layer, each unit structure comprises two long graphene ribbons arranged in parallel at intervals and four short graphene ribbons arranged between the two long graphene ribbons, the four short graphene ribbons are symmetrically arranged at the two ends of the two long graphene ribbons in pairs, and the outer ends of the short graphene ribbons are flush with the ends of the long graphene ribbons. Fano resonance is combined with the graphene terahertz sensor, electric dipole resonance caused by the action of an electric field and a magnetic field is utilized to generate a Fano resonance phenomenon, radiation loss is effectively reduced and the Q value of the sensor is improved through destructive interference action between a light mode and a dark mode, and the terahertz sensor has good sensing performance and can be used for sensing terahertz waves. The method has important application potential in the aspects of biomedicine and sample detection.

The invention discloses a polymer dual-band refractive index sensor based on a continuous domain bound state and a manufacturing method of the polymer dual-band refractive index sensor. The sensor comprises a silicon dioxide substrate and polymer metasurface structure units distributed on the upper surface of the silicon dioxide substrate in an array mode. Each polymer metasurface structure unit comprises four positive polygonal cylinders and a cylinder, the four positive polygonal cylinders are identical in size, the positive polygonal cylinders and the cylinder are perpendicular to the silicon dioxide substrate, the positive polygonal cylinders are arranged in a matrix mode, and the cylinder is located in the center of the four positive polygonal cylinders. The introduction of the central cylinder not only breaks the structural symmetry to excite the quasi-BIC, but also enhances the coupling effect among the four straight square columns, thereby greatly improving the near-field enhancement effect. The refractive index sensor has the characteristics of double quasi-BIC sensing wavebands, high sensitivity, high Q value, polarization insensitivity and the like, and the detection efficiency, flexibility and accuracy of the refractive index sensor in the biomedical field are improved.

The invention provides carbon-based material reinforced interpenetrating network conductive hydrogel as well as preparation and application thereof, and belongs to the field of flexible electronics and sensing materials. The method comprises the following steps: (1) preparing a carbon-based material organic dispersion liquid; and (2) preparing the interpenetrating network conductive hydrogel. The prepared interpenetrating network conductive hydrogel is composed of an SF network and a hydrophobicity-associated PAM network, a carbon-based material organic dispersion liquid is added into the SF network and the hydrophobicity-associated PAM network, so that the carbon-based material is uniformly dispersed in the gel network, the carbon-based material is easily mutually pulled with an SF molecular chain and a PAM molecular chain in the gel network to form electrostatic interaction and hydrogen bonds, and the conductivity of the hydrogel is improved. Meanwhile, the PAM molecular chain, the SF molecular chain and the carbon-based material have rich hydrophilic groups, so that a plurality of dynamic hydrogen bonds can be formed, and the interface interaction between the conductive material and a polymer matrix is greatly improved; the interpenetrating network conductive hydrogel prepared by the invention is used as a response thixotropic sensor and has excellent sensing performance.

The invention discloses a bimetallic Ag and Pd loaded WO3 material and a preparation method thereof, and relates to the technical field of sensor material preparation, and the preparation method comprises the following steps: 1, dissolving a tungsten source in an ethanol solution, mixing, hydrolyzing, aging, precipitating, washing, drying, calcining and cooling; 2, adding deionized water, adding a silver source solution and a palladium source, adding ascorbic acid, and stirring; 3, centrifuging, washing with ethanol and deionized water, and drying; 4, selecting a gold interdigital electrode with aluminum oxide ceramic as a substrate as a base electrode material, dipping the WO3 nano-particle dispersion liquid by using a line drawing pen, and uniformly coating the WO3 nano-particle dispersion liquid on the surface of the interdigital electrode; and 5, electrode drying and heat treatment. The efficient gas sensing material is prepared through the preparation method which is easy to operate, environmentally friendly and economical, and the gas sensing material has the advantages of being high in sensitivity, rapid in response, good in selectivity and the like at the low working temperature.

The invention belongs to the technical field of composite materials and sensors, and particularly relates to a preparation method and application of an ultrahigh-tensile conductive hydrogel material. The preparation method comprises the following steps: adding acrylamide (AM), N, N '-methylene bisacrylamide (MBA), ammonium persulfate (APS) and an MXene organic dispersion liquid into a sodium carboxymethyl cellulose (CMC-Na) solution at room temperature, and uniformly stirring to obtain a prefabricated liquid; transferring into a mold, and carrying out polymerization reaction in a drying oven for 2-6 hours to prepare CMC-Na / PAM / MXene conductive hydrogel of an interpenetrating network; the prepared CMC-Na / PAM / MXene conductive hydrogel of the interpenetrating network is soaked in ethylene glycol aqueous solutions with different concentrations, and after solvent replacement, the ultrahigh-tensile conductive hydrogel is prepared. The MPAE conductive composite hydrogel provided by the invention can accurately monitor tiny motion information of a human body and has good sensing performance.

The invention belongs to the technical field of fabric coatings, and particularly relates to a self-cleaning sensing type composite coating for fabric and a preparation method of the self-cleaning sensing type composite coating. The self-cleaning sensing type composite coating comprises a polypyrrole coating, a ferroferric oxide coating and a hydrophobic polyurea modified coating. The self-cleaning sensing type composite coating has good self-cleaning performance, sensing performance, wave absorbing performance and hydrophobic performance.

The invention discloses a high-performance self-powered NO2 sensor based on a nitrogen-doped MOF-derived In2O3 core-shell fiber structure sensitive material and a preparation method of the high-performance self-powered NO2 sensor, and belongs to the technical field of semiconductor metal oxide gas sensors. The flexible NO2 sensor is composed of a friction nanometer generator and a flexible NO2 sensor based on a nitrogen-doped MOF-derived In2O3 core-shell fiber structure. The nitrogen-doped MOF-derived In2O3 core-shell fiber structure sensitive material prepared by the invention has layered pores of a core-shell structure and effective doping of nitrogen, so that reconstruction of a surface electronic state is facilitated, the gas-sensitive characteristic of a sensor to NO2 is effectively improved, and the material has good selectivity and relatively low detection lower limit. According to the self-powered NO2 sensor, the sensor and the friction nanometer generator are integrated, preparation of the self-powered NO2 sensor is achieved, resistance signals are converted into voltage signals, the sensitivity of the sensor is effectively improved, the response time is shortened, and an effective strategy is provided for high-performance and self-powered NO2 detection at the room temperature.

The invention discloses a methane sensor based on a micro-nano optical fiber coupler and a methane concentration measuring method. The methane sensor comprises a broadband light source, a sensing unit and an oscilloscope which are sequentially connected from front to back, the sensing unit comprises a micro-nano optical fiber coupler, an indium oxide coating and a silver coating, and the silver coating and the indium oxide coating are sequentially arranged in the middle of the micro-nano optical fiber coupler from inside to outside; one end of the micro-nano optical fiber coupler is provided with a P1 port and a P2 port which are used as input ends, and the other end of the micro-nano optical fiber coupler is provided with a P3 port and a P4 port which are used as output ends. Ports P1 and P2 of the micro-nano optical fiber coupler are connected with the output end of the broadband light source, and a port P3 of the micro-nano optical fiber coupler is connected with the oscilloscope. The methane concentration is calculated based on the optical interference principle of the micro-nano optical fiber coupler, and the influence of external factors such as volume, pressure and temperature is eliminated. The device has the advantages of being small in size, high in external interference resistance and good in corrosion resistance, can better adapt to various environments, and has wide development space and good practicability.

The invention discloses a preparation method of antibacterial conductive copper nanoparticles, the copper nanoparticles and application. The method comprises the following steps: 1) adding copper sulfate pentahydrate and polyvinylpyrrolidone into ultrapure water to obtain a precursor solution; 2) heating the precursor solution to 75-95 DEG C, adding an ascorbic acid solution and dimethylethanolamine, carrying out a stirring reaction at 75-95 DEG C, and carrying out a heat preservation reaction at 60-80 DEG C to obtain a first solution; 3) filtering, washing, drying and sintering the first solution at low temperature to obtain copper nanoparticles; the copper nanoparticles are used for preparing antibacterial agents, flexible antibacterial materials or flexible sensors. The method is simple and easy to operate, operation is easy, technological parameters are easy to control, raw materials are easy to obtain, environment friendliness is achieved, performance is stable, and the obtained copper nanoparticles have good high temperature resistance, antibacterial property, conductivity and sensing performance and better meet the requirements of the modern chemical industry for environmental protection and sustainable development.

The invention provides a communication perception integrated waveform design method for the Internet of Vehicles, which belongs to the technical field of wireless communication, and can realize peak performance, enhance radar capability and ensure efficient communication by minimizing the weight sum of multi-user interference, the similarity between a design waveform and a reference waveform, a Cramer-Rao bound and an ISAC waveform. According to the method, optimization with the total transmission power and the peak-to-average power ratio as constraints is adopted, a non-convex problem is converted into a convex problem, an alternating direction multiplier method algorithm is adopted for solving, and a simulation result shows that the ISAC waveform has good communication and target detection capability, and the V2X spectrum utilization rate can be improved. According to the method, a target can be detected during communication with a downlink user, the sum of MUI, CRB and waveform similarity is minimized, weighing parameters are introduced, flexible weighing between communication and sensing is achieved under the constraint of the total power and the peak-to-average power ratio, the method better adapts to a V2X high-dynamic scene, and mutual interference caused by separation of traditional sensing and communication functions is reduced.

The invention relates to a preparation method and application of lignin deep eutectic gel. The lignin deep eutectic gel provided by the invention has the advantages of excellent conductivity, low vapor pressure, low cost, easiness in preparation, environment friendliness and the like. The deep eutectic solvent has very strong dissolving capacity for acrylamide, can be stored for a long time in a dry environment at room temperature, and still keeps excellent conductivity, flexibility and adhesion even in a low-temperature environment. The lignin deep eutectic gel disclosed by the invention has extremely strong adhesion performance, catechol groups of lignin can continuously generate viscous substances, the lignin also enhances the mechanical properties of the gel, and the application range of a gel sensor is widened; the conductive gel prepared by the invention can be used as a biological electrode patch to realize human motion monitoring. And meanwhile, the cable can be used as a conductor to be assembled into a resistance-type strain sensor, so that multifunctional sensing is realized, and the cable has great potential in the fields of human health monitoring, motion monitoring, high and low temperature severe environment monitoring and the like.

Example embodiments relate to devices, systems, and methods related to a three-dimensional time-of-flight / visible image sensor. Example embodiments include an apparatus that includes a plurality of time-of-flight sensor (ToF) pixels and a plurality of visible image sensor (VIS) pixels. The apparatus also includes a ToF communication channel configured to provide ToF image data indicative of one or more ToF pixels, and a VIS communication channel configured to provide VIS image data indicative of one or more VIS pixels. The plurality of ToF pixels and the plurality of VIS pixels are arranged along a plane. The plurality of ToF pixels are disposed in an arrangement between the plurality of VIS pixels.

The invention discloses a UV-CIPP material for pipeline repair and intelligent water level monitoring and a preparation method of the UV-CIPP material, and belongs to the technical field of ultraviolet curing pipeline repair. The preparation method comprises the following steps: selecting a proper amount of MWCNTs solution; the woven glass fibers are put into the dipping solution to be soaked; coating a conductive silver adhesive on the woven glass fiber, and pasting a copper electrode; adding a thermal initiator into the ultraviolet curing resin; pouring the resin into a mold, and laying woven glass fibers; and carrying out ultraviolet light curing and thermocuring on the prefabricated member. By introducing the MWCNTs impregnated woven glass fiber sensing layer and adopting ultraviolet light / heat dual curing, the intelligent pipeline composite material with ultrahigh strength and ultrahigh sensing capacity is formed, and the change of the water level in a pipeline can be monitored in real time while the pipeline is repaired.

The invention discloses a carbon nanotube fiber microfilament electrode and a preparation method and application thereof, and belongs to the technical field of electrode materials. The carbon nanotube fiber microfilament electrode provided by the invention comprises a carbon nanotube fiber bundle and an insulating layer, the surface of the carbon nanotube fiber bundle is coated with the insulating layer, the end part of the carbon nanotube fiber bundle is not coated with the insulating layer, and the end part is a sensing area. The carbon nanotube fiber microfilament electrode has good sensing performance, can achieve a good sensing detection effect in vitro and in vivo, particularly has good in-vitro selective recognition capability on neuroactive substances such as dopamine, uric acid and ascorbic acid, can be used for accurate detection in complex biological samples, and has good application prospects. The synchronous detection capability on neuroactive substances such as dopamine, uric acid, ascorbic acid and the like is also shown in an in-vivo environment.

The invention belongs to the technical field of biosensing, and particularly relates to G-MXene-PAA-Fe < 3 + > hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: modifying MXene by adopting an antioxidant to prepare modified G-MXene; then, acrylic acid (AA) free radical polymerization chemical crosslinking is used as a first network, polyacrylic acid (PAA)-Fe < 3 + > metal ion complexing is used as a second network, modified G-MXene is used as a cross-linking agent and a conductive nano filler, and under the action of an initiator ammonium persulfate, the G-MXene-PAA-Fe < 3 + > self-healing conductive hydrogel is prepared by adopting a simple and easy-to-operate one-pot method. The prepared self-healing conductive hydrogel has excellent stability, self-healing performance, mechanical performance, conductivity and sensing performance, and has a wide application prospect in the field of flexible sensors.

The invention discloses lead-free perovskite Cs2NaHoBr6 as well as a fractal structure, a preparation method and application thereof, and belongs to the technical field of photoluminescence and fractal crystal growth. The lead-free perovskite Cs2NaHoBr6 is successfully synthesized through a novel solvent boiling method, and compared with a traditional fluorescence thermal quenching perovskite material, the lead-free perovskite shows thermally enhanced red light and near infrared light emission under excitation of ultraviolet light, blue light and near infrared light, has up-conversion and down-conversion luminescence capabilities, and can be used for preparing a luminescent material. The emission peak intensity is in positive correlation in the range of 293-593 K, and an abnormal heat quenching resistance behavior is shown. Cs2NaHoBr6 powder is dissolved in an anti-solvent, and a fractal structure pattern with preferred orientation and self-similarity characteristics is prepared by using an in-situ solution crystallization method, so that the temperature sensing performance of the compound is remarkably improved, the relative sensitivity of the compound is enhanced from 1.14% K <-1 > to 2.60% K <-1 >, and the compound shows a good application prospect in the aspect of non-contact optical temperature measurement.

The invention discloses a preparation method and application of a Fe2O3 doped SnO2 nanofiber gas sensor. The preparation method comprises the following steps: (1) preparing Fe2O3 doped SnO2 nanofibers; (2) manufacturing a gas sensor; the preparation method comprises the following steps: taking Fe2O3 doped SnO2 nanofiber, namely Fe2O3-SnO2, as a gas sensitive sensing material; and (3) regulating and controlling parameters of a temperature modulation technology. The invention aims to controllably prepare the Fe2O3-doped SnO2 nanofiber gas sensor, and the sensing performance is optimized by adopting a temperature modulation method, so that the aim of successfully identifying n-propyl alcohol is fulfilled. The working mechanism of the modified material is deeply discussed by characterizing the structure and performance of the material and the influence of temperature on gas response characteristics, and a new thought and method are provided for the application of the Fe2O3-doped SnO2 nanofiber gas sensor in identification and detection of environmental pollutants.

The invention relates to the field of special equipment detection, in particular to a digital-based special equipment sensing information processing system and method.The digital-based special equipment sensing information processing system comprises a film cultivation module, a classification excitation module, a high-temperature stabilization module, a sound wave control module and a matrix analysis module; the classification excitation module is used for performing annealing treatment on a film to different degrees and recovering excitation sound waves; the high-temperature stability module is used for fitting a thermal stability function of the film; the sound wave control module is used for matching a to-be-detected material and an ultrasonic sensor; the matrix analysis module is used for adjusting excitation current and analyzing material stress; the preparation process and the production process of the ultrasonic piezoelectric film can be optimized, the production efficiency and the product quality are improved, meanwhile, the sensing performance of the ultrasonic piezoelectric film is improved, the detection sensitivity and the resolution of sound waves are enhanced, and more efficient sound wave excitation and sensing functions are achieved.

The CSHS reaction device comprises a liquid phase conveying system, a reaction system, a temperature control system and a sample collection system, the liquid phase conveying system consists of three same high-pressure conveying pumps for liquid chromatography, corresponding liquid phase pipelines and adapters; the reaction system consists of two sets of electric heating devices, corresponding liquid phase pipelines and adapters; the temperature control system controls the two sets of electric heating devices to enable the electric heating devices to be subjected to programmed temperature rise and stabilize the temperature to be 400 DEG C or above; and the sample collection system consists of a water cooling device, a filter and a back pressure valve. The CSHS reaction device is applied to preparation of a semiconductor H2S sensing material, is good in structural consistency and excellent in sensing performance, and can meet application requirements.

The invention provides a sensor preparation method based on organ-shaped MXene, V4AlC3 takes Al and Co as catalysts at room temperature, an HF aqueous solution is used for selectively etching an Al layer in the V4AlC3 to prepare a V4C3Tx room-temperature gas-sensitive material, and then the V4C3Tx room-temperature gas-sensitive material is transferred to a flexible substrate to prepare an acetone gas sensor, and the method comprises the following specific steps: (1) preparing a high-molecular flexible substrate; (2) preparation of organ-shaped MXene; and (3) transferring the gas sensitive material to a flexible substrate to prepare the acetone sensor. The acetone sensor of V4C3Tx prepared by the invention has a low working temperature of 25 DEG C, a low detection limit of 1 ppm and high selectivity to acetone in mixed gas of acetone and water vapor. Different electrodes can be deposited on the flexible substrate, the cost is low, the steps are simple and controllable, the flexibility is good, the sensitivity is high, and the acetone can be detected at room temperature.

The fingerprint sensor includes: a plurality of sensing structures arranged in a sensing plane for capacitive sensing of a fingerprint; a charge modification device comprising a plurality of charge modification structures arranged relative to the plurality of sensing structures to form a plurality of capacitors, and a charge modification circuit arranged between the plurality of charge modification structures and the plurality of capacitors, a charge modification circuit coupled to each of the plurality of charge modification structures and controllable to provide a voltage signal to the plurality of charge modification structures, thereby modifying an amount of charge carried by the sensing structure; and a measurement circuit coupled to the plurality of sensing structures for providing a measurement signal indicative of a capacitive coupling between each of the plurality of sensing structures and the finger, where the charge modification device is configured to provide different charge modifications for different ones of the plurality of sensing structures.

The invention discloses a preparation method of an impact-resistant elastic conductor material for 3D printing, and the method comprises the steps: taking silver particles / silver nanosheets as a conductive phase, and taking polyboron dimethyl siloxane as an impact-resistant material; by adding the polyhydroxy low-boiling-point solvent, the density of B-O dynamic cross-linking bonds in the polyboron dimethyl siloxane is reversibly adjusted, meanwhile, the number of silicon hydroxyl is reversibly increased, the hydrogen bond density is improved, the printability of the PBS is enhanced, and meanwhile, the cushioning effect of the PBS is not affected. According to the invention, the reduction and recovery of B-O density are controllable based on a reversible reaction principle of a polyhydroxy low-boiling-point solvent and a B-O dynamic cross-linking bond, and meanwhile, due to the seepage effect of silver powder particles / silver sheets, the Ag / PBS impact-resistant elastic conductor shows excellent conductivity. After the polyhydroxy low-boiling-point solvent in the printed pattern is subjected to vacuum drying, the B-O dynamic crosslinking bond density is recovered, and the Ag / PBS impact-resistant elastic conductor recovers good shear thickening effect, conductivity, sensing performance and self-repairing performance.

The present application relates to a kind of based on carbonized wood natural structure dopamine electrochemical sensor and its preparation method and application, the working electrode of the electrochemical sensor is modified with carbonized wood-ZnO nanowire-ZIF-8.The electrochemical sensor of the present application uses carbonized wood as substrate, after cutting carbonized wood whole piece, using conductive carbon paste is pasted on working electrode, while ensuring conductivity, also retain the three-dimensional structure of nanomaterial not be destroyed, guarantee the performance of sensor, with good application prospect.

This application belongs to the field of communication technologies, and discloses a data transmission processing method and apparatus, a communication device, and a storage medium. The data transmission processing method in embodiments of this application includes: performing, by a transmit end, spectrum spreading on to-be-transmitted data through K orthogonal sequences, to obtain K orthogonal data matrices, where K is an integer greater than 1; the transmit end maps the K orthogonal data matrices onto different frequency division multiplexing OFDM subcarriers, to obtain K first OFDM signals, where the first OFDM signals are spectrum spreading data matrix OFDM signals; performing, by the transmit end, inverse fast Fourier transform IFFT processing on a kth first OFDM signal among the K first OFDM signals, to obtain a kth first OFDM time domain signal, where k is a positive integer less than or equal to K; and the transmit end maps the kth first OFDM time domain signal onto a kth transmit antenna, and transmits a first data signal through the kth transmit antenna.

The invention discloses a DNMT3A gene mutation detection kit and a detection method, and belongs to the field of gene detection. The kit comprises an ERA primer aiming at the R882 site of the DNMT3A gene, crRNA targeting R882H / C mutation, a Cas12a protein and a single-stranded DNA fluorescent reporter molecule, and can further comprise an AciI restriction enzyme, an ERA reagent and a DNMT3A gene R882 site mutation positive standard substance, wherein the sequences of the ERA primer, the crRNA, the Cas12a protein and the single-stranded DNA fluorescent reporter molecule are shown as SEQ ID NO.5 and SEQ ID NO10. Through efficient amplification of the ERA and cutting of the AciI incision enzyme, isothermal amplification and restriction enzyme digestion of the ERA are synchronized, a large number of R882 mutation enriched amplification products are generated, the sensing performance of the amplification products is further improved through CRISPR / Cas12a, and therefore the method has the advantages of being good in accuracy, high in sensitivity, high in selectivity, high in anti-interference capacity, good in repeatability and the like.

The invention provides a programmable robot control system, which relates to the technical field of robot control, and comprises a flexible humidity sensor array, an energy storage module, a resistance acquisition device, Bluetooth and a robot control end, the energy storage module supplies power to the resistance acquisition device and the Bluetooth, the flexible humidity sensor array is connected with the resistance acquisition device, the resistance acquisition device uploads acquired data to the robot control system through the Bluetooth, and the robot control system processes the data and converts the data into corresponding control signals so as to control movement of the programmable robot. According to the technical scheme, the problem that in the prior art, a programming robot is controlled in a contact mode, and bacteria or viruses are likely to be spread is solved.

The invention provides a method for preparing a photonic crystal fiber with sensing and filtering functions. The method comprises the specific steps that a first layer of air holes are formed in the circle center of quartz; by taking the first layer of air holes as the center, two second type of air holes and three third type of air holes are formed in the periphery of the first layer of air holes along a regular hexagon; by taking the first layer of air holes as the center, two first type of air holes and nine third type of air holes are formed in the periphery of the first layer of air holes along a regular hexagon; thirteen third-type air holes are formed in the periphery of the first-layer air holes in a regular hexagon mode with the first-layer air holes as the center; and preparing a preform according to the arranged cladding, melting and drawing wires, and depositing gold on a polished plane to obtain the photonic crystal fiber, and immersing the photonic crystal fiber in a liquid to be detected when in use. According to the invention, integration of the optical fiber sensor and the filter is realized, high-sensitivity sensing is realized in the X polarization direction, and polarization filtering with adjustable bandwidth and high extinction ratio is realized in the Y polarization direction.

The invention belongs to the field of nano materials, and particularly relates to a Ga-doped Co3O4 nano flower, a preparation method and application of the Ga-doped Co3O4 nano flower as a gas sensitive material. The Ga-doped Co3O4 nanoflower is in a flower-ball shape, and the diameter of the Ga-doped Co3O4 nanoflower is 10 microns; the doping amount of the metal Ga is 1%-5% of the substance amount of the metal Co; the preparation method of the Ga-doped Co3O4 nanoflower comprises the following steps: synthesizing a multi-metal Co (OH) 2 nanoflower by a wet impregnation and freeze drying method, taking the multi-metal Co (OH) 2 nanoflower as a template, and roasting in an air atmosphere to prepare a Ga-Co3O4 gas sensitive material with a nanoflower morphology; the Ga-Co3O4 nanoflower gas sensitive material prepared by the preparation method disclosed by the invention has a good sensitive characteristic on CO; according to the invention, the heterogeneous element is used for replacing and preparing the bimetallic MOS to improve the gas-sensitive performance of the metal oxide, and the cost is low; the method is low in raw material cost, wide in source, simple in step, environmentally friendly, free of pollution, free of impurity ion introduction, capable of achieving mass production and convenient to achieve large-scale industrial production.