64 results about "Silver nanorods" patented technology

The invention specifically relates to arrayed silver nanorods with surface-modifying gold nanoparticles and a preparation method thereof, belonging to the field of nano-materials. The objective of the invention is to realize surface modification of a silver nanorod array prepared by using a physical evaporation coating process; the surfaces of silver nanorods are modified by polyelectrolyte (poly[diallyldimethylammonium chloride]) with positive electricity at first, then gold nanoparticles having a diameter of about 15 nm and synthesized by using a wet chemical process are used as a raw material which self-assembles on the surfaces of silver nanorods through electrostatic interaction, and thus, the silver nanorod array with surface-modifying gold nanoparticles is prepared. The technology of gold nanoparticle modification of the surfaces of silver nanorods brought forward in the invention has the advantages of safe and easy operation, mild conditions, low cost, etc. and enables gold nanoparticles to be uniformly fixed on the surfaces of silver nanorods so as to form a gold-silver composite structure.

The invention discloses a high-stability surface-enhanced Raman substrate and a preparation method thereof and belongs to the technical field of detection on trace organic substances. The preparation method of the high-stability surface-enhanced Raman substrate comprises the following steps: preparing a silver nanorod array by an oblique growth method and then uniformly coating the surface of silver nanorods with an amorphous-state aluminum oxide film by a low-temperature atom layer deposition technology. Due to the adoption of relatively low deposition temperature in the substrate prepared by the method, the shape of the silver nanorods is unchanged; meanwhile, by virtue of the ultrathin aluminum oxide film, a surface-enhanced Raman effect is not greatly attenuated, so that the substrate has a good surface-enhanced Raman effect; the surface of the silver nanorods is uniformly coated with the aluminum oxide film, so that the silver nanorods are isolated from an outside environment, the oxidation resistance and the vulcanization resistance of the silver s are improved, and the stability of the surface-enhanced Raman effect of the silver nanorods is greatly improved; the high-stability surface-enhanced Raman substrate has wide application prospects in the aspects of trace and fast detection on organic substances.

The invention discloses an SERS sensor for integrated detection of tumor protein and nucleic acid markers and a preparation method thereof. The SERS sensor comprises a silver nanorod array substrate and an SERS probe, wherein the surface of the silver nanorod array substrate is modified with a tetrahedral DNA structure; the tetrahedral DNA structure is formed by self-assembling six DNA single chains, and three DNA single chains are arranged on three edges of the tetrahedral DNA structure, are respectively connected with three capture chains and are used for respectively and specifically binding nucleic acid and a protein marker. The detection limits of the SERS sensor for detecting nucleic acid and protein respectively reach the Amol / L magnitude and the fg / mL magnitude; the integrated detection of various nucleic acid and protein biomarkers in complex environments such as serum can be realized. The sensor disclosed by the invention is simple to prepare, high in detection sensitivity and good in reliability, can realize high-sensitivity detection of biomarkers with extremely low abundance in the early stage of lung cancer, and has good universality for various tumor biomarkers.

The invention discloses a surface enhanced Raman scattering substrate for detecting pesticides, and a production method and an application thereof. The substrate comprises a base sheet, a titanium film covering the surface of the base sheet, a silver film covering the surface of the titanium film, and a silver nanorod array layer covering the surface of the silver film, and an included angle between silver nanorods and the surface of a glass sheet is 86 DEG. The substrate is produced through cleaning the base sheet, producing the titanium film and the silver film, and producing the nanorod array layer. The substrate is applied to pesticide detection, and is especially suitable for onsite rapid detection of the food safety problem.

The invention discloses a silver nanorod and a preparing method thereof. Polyhydric alcohols are used for reducing silver ions at high temperature to prepare the silver nanorod. The polyhydric alcohols are oxidized into acetaldehyde at high temperature. The acetaldehyde has strong reducibility, so that the silver ions are reduced to silver atoms. The silver atoms are gathered and stacked, seed crystals are formed, and the newly-generated silver atoms are induced to grow continuously on the seed crystals to obtain the silver nanorod. The technology is simple, operation is easy, and the method is suitable for batch preparing of silver nanorods with high yield and high evenness.

The invention discloses a silver nanorod / polymer / silver nanosheet core-shell nanometer material and a preparation method and application of the silver nanorod / polymer / silver nanosheet core-shell nanometer material. The silver nanorod / polymer / silver nanosheet core-shell nanometer material is characterized in that the core-shell nanometer material is composed of the three portions of a silver nanorod core, a polymer cladding layer and a silver nanosheet outer layer, the polymer cladding layer is polystyrene-polyacrylic acid segmented copolymer layer with the thickness being 10 nanometers; the length of the silver nanorod core is from 400 nanometers to 1.3 microns, and the silver nanosheet outer layer is irregular sheets with the edge length being 120-320 nanometers correspondingly; or the length of the silver nanorod core is 175-310 nanometers, and the silver nanosheet outer layer is in a bolt shape with the bottom edge length being 510-780 nanometers correspondingly and covers half of the silver nanorod core. The silver nanorod / polymer / silver nanosheet core-shell nanometer material is prepared through a seed inducement method. The silver nanorod / polymer / silver nanosheet core-shell nanometer material and the preparation method and application of the silver nanorod / polymer / silver nanosheet core-shell nanometer material have the advantages that SERS signal output quite high in intensity is generated, the preparation technology is simple, the preparation period is short, the yield is high, and popularization and mass production are easy.

The invention discloses an Ag nanowire / polyurethane flexible transparent conductive composite film with biocompatibility, electric conductivity and light transmission performance and a preparation method thereof, comprising the following steps of: preparing silver nanowires by a polyol method; Ag nanowire / polyurethane flexible transparent conductive composite films are synthesized by two-step method. The film prepared by the invention has certain electric conductivity and light transmission performance, and the silver nanorods are uniformly distributed on the surface of the polyurethane substrate; the transmittance of the composite film is about 45%. The average resistance is about 35 M OMEGA. The maximum tensile strength of the composite film is 1.819 MPa, the maximum tensile load is 3.082 N, and the maximum elongation at break is 824.280%. The composite film has excellent properties, and has broad application prospects in the field of photoelectric devices.

The invention provides a method of regulating and controlling lengths of silver nanorods in a polyhydric alcohol reduction method through hydrogen peroxide. The method comprises the following steps that silver nitrate and glycerol are blended and stirred and dissolved to obtain a solution A; sodium chloride, polyvinylpyrrolidone, the glycerol and the hydrogen peroxide are blended and stirred and reacted at the temperature which ranges from 160 DEG C to 200 DEG C for 15 minutes to 4 hours to obtain a solution B; the solution A is mixed in the solution B and reacted at the temperature which ranges from 160 DEG C to 200 DEG C for 15 minutes to 4 hours, a centrifugal separation of a reaction solution is conducted, a lower layer sediment is obtained and washed, and the silver nanorods with different lengths are obtained. The method is simple in technology, low in cost, the lengths of the silver nanorods can be changed only by adding the hydrogen peroxide, the lengths of the silver nanorods can be regulated and controlled according to the adding amount of the hydrogen peroxide, the diameter of the silver nanorods has no obvious changes while the lengths are changing, the uniqueness of regulation and control is guaranteed, and the method is incapable of introducing impurities and is suitable for large-scale industrial production.

The invention discloses a preparation method of a flower-shaped nano-silver powder self-assembly structure. The preparation method of the flower-shaped nano-silver powder self-assembly structure adopts a hydrothermal method, in the presence of a surfactant PVP, AgNO3 is reduced by using ascorbic acid (AsA), the novel two-dimensional flower-shaped nano-silver self-assembly structure which is assembled from silver nanorod bundles and high in yield is synthesized. Under simple technical conditions, controllable preparation of the two-dimensional flower-shaped nano-silver ultra-fine structure is achieved. The preparation method is simple and feasible, has no pollution to the environment and is low in cost and good in controllability, the final appearance of a product can be controlled, the multi-morphology two-dimensional flower-shaped nano-silver ultra-fine structure can be obtained, and the special morphology structure can have important application in the aspects of future nano devicesand biosensors.

The invention provides a micro-nano structure large-field-angle achromatic wave plate which can realize the conversion from linearly polarized light to circularly polarized light or elliptically polarized light in a large field angle range. The micro-nano structure large-field-angle achromatic wave plate realizes achromatism at a large field angle by using a rectangular nanorod array. The micro-nano structure large-field-angle achromatic wave plate uses silver nanorods, and can control the absolute value of a phase difference in the orthogonal direction to be about [pi] / 2 within a certain waveband range, thereby realizing achromatism in a certain waveband range and regulating the polarization state of emergent light.

The present invention relates to a silver-silver phosphate-zinc oxide ternary heterogeneous composite structure and a preparation method thereof. The preparation method is as below: synthesizing silver nanorods by using ethylene glycol as a solvent; depositing silver phosphate on the surface of silver nanorods by a solution co-precipitation method byusing silver nanorods as a template to obtain a silver-silver phosphate composite structure; and finally, growing zinc oxide nanorod arrays with broad-band gap on the silver phosphate surface through a seed growth method to obtain the silver-silver phosphate-zinc oxide ternary composite structure product. The product prepared by the present invention has a ternary heterogeneous composite structure; silver nanorods are used as the core, silver phosphate grows and coats on the silver nanorods, and zinc oxide nanorods grow on the silver phosphate shells; and the silver nanorods have diameter of about 500 nanometers, the silver phosphate is in an amorphous shape, and the size of zinc oxide nanorods is controllable.

The invention discloses a method for preparing and calibrating performance of a surface-enhanced substrate. By using a dynamic shadow deposition technology and an electron beam evaporation film deposition system, silver nanorods uniformly arranged obliquely are grown on a clean glass sheet under high vacuum conditions. Array, the surface-enhanced substrate prepared by this method has a special silver nanorod array structure, which makes it have high sensitivity and superior stability. The surface-enhanced substrate produced by this method has high repeatability, and the same batch of different surface-enhanced substrates The SERS intensity varies by less than 10%, and the SERS intensity of different batches of substrates varies by less than 15%. Compared with other nanostructure preparation technologies, it has strong controllability, low cost, high repeatability, and is suitable for large-scale production.

The invention especially relates to a surface-enhanced Raman scattering substrate with pin holes in its surface and a preparation method, belonging to the technical field of detection of trace substances. According to the invention, a silver nanorod array film is prepared by using an inclined growth process; and then a layer of an alumina film with pin holes is uniformly deposited on the surface of the silver nanorod array film by using low-temperature atomic layer deposition technology, and an obtained sliver-alumina composite nanostructure with pin holes in its surface is used as the surface-enhanced Raman scattering substrate. The method can adjust the parameters of the low-temperature atomic layer deposition technology to control the proportion of the pin holes in the alumina film; an ultrathin oxide layer of the alumina film ensures good surface-enhanced Raman scattering activity of the substrate; and interior silver nanorods are isolated from the outside, so chemical stability of the substrate is greatly improved. Moreover, the alumina film and silver surface layers in the pin holes can both adsorb specific detection molecules; and the substrate is applicable to detection of a plurality of chemical substances, expands the application scope of surface-enhanced Raman scattering and has wide application prospects.

The invention belongs to the technical field of detection of trace organics and discloses a surface-enhanced Raman substrate and a preparation method thereof. The preparation method employing obliquegrowth comprises: depositing an oxide layer at the top end of a silver nanorod array; depositing silver nano particles at the top end of the oxide layer to obtain silver nanorod-oxide-silver particlecomposite serving as the surface-enhanced Raman substrate. The surface-enhanced Raman substrate prepared via the preparation method gains improved thermal stability owing to high melting point of theoxide layer and protection for silver nanorods; the silver nanorods and the silver nano particles are isolated via the oxide layer which is ultra-thin, strong local electromagnetic field enhancement is provided at a gap, and therefore, sensitivity of the substrate herein is greatly improved. The substrate herein is applicable to detection at high temperatures, has great signal-enhancing capacity,provides a widened applicable range for surface enhanced Raman technology, and has great development potential.

The invention provides a display panel and a display device, wherein the display panel comprises: a first display area and a second display area; and a light emitting device located in the first display area; the light emitting device comprises a composite anode structure; in a direction perpendicular to the display panel and directed to a light emitting surface of the light emitting device, the composite anode structure comprises a first electrode layer, a function adjustment layer and a second electrode layer, which are sequentially stacked; and the function adjustment layer comprises a plurality of silver nanorods, the composite anode structure comprises a first state and a second state, and the transmittance of the composite anode structure in the first state is greater than the transmittance in the second state. The display panel is used for improving the imaging quality.

The invention discloses a method for detecting artificial synthetic pigment by combination of a thin-layer chromatography technique and a surface enhanced Raman spectroscopy technique, comprising thefollowing steps: A, preparation of a silver nanorod array substrate: a titanium film and a silver film are deposited on the surface of a glass substrate by a glancing angle deposition technique, and the glancing angle is regulated and then the silver nanorod continues to be deposited; B, development of thin-layer chromatography: development of thin-layer chromatography is carried out on artificialsynthetic pigments on the silver nanorod array substrate by using methanol; C, surface enhanced Raman spectroscopy detection: Raman spectroscopy detection is carried out on a sample after the development. The method provided by the invention can help quickly distinguish different artificial synthetic pigments, and has the advantages of simple operation process, low cost, high sensitivity and thelike.

The invention discloses a control method for gold atom deposition on a silver nanostructure. The control method for gold atom deposition on the silver nanostructure comprises the following steps of S1, taking a gold nano bipyramid as a core, epitaxially growing silver to prepare a silver nanorod, and distributing a high surface energy surface and a tip position in an ectopic mode; S2, dispersing the silver nanorod serving as a reaction template into a hexadecyl trimethyl ammonium bromide solution, adding an ascorbic acid solution, and uniformly stirring; S3, adjusting the pH value of the mixed solution so as to adjust the reducibility of the ascorbic acid solution and to achieve the adjustment of the ratio between the replacement reaction and the co-reduction reaction in a reaction system; and S4, dropwise adding a gold precursor solution into the obtained reaction system, wherein the reaction system is converted into a co-reduction reaction system from a replacement reaction system, and the deposition position of reduced gold atoms is gradually migrated to the tip of the silver nanorod from the high surface energy face. According to the control method for gold atom deposition on the silver nanostructure, controllable deposition of the gold atoms can be achieved by adjusting the pH value of the reaction system, the conditions are simple and mild, and operability is high.

The invention discloses a surface-enhanced Raman scattering detection kit for detecting small tumor nucleic acid markers for a non-disease diagnosis purpose as well as a preparation method and application of the surface-enhanced Raman scattering detection kit. The kit comprises an SERS detection chip, a first reagent and a second reagent. The SERS detection chip is a silver nanorod array substrate with the surface modified with a hairpin type DNA single chain H1, the first reagent is a hairpin type DNA single chain H2, the second reagent is an SERS probe, after the first reagent and the second reagent are added to the SERS detection chip at the same time, the single chain P of the probe on the second reagent is hybridized with the cohesive end of the H1-H2 double chain, and the SERS detection chip is a silver nanorod array substrate with the surface modified with the hairpin type DNA single chain H1. The SERS probe is captured on the SERS detection chip (the base sequence of the nucleic acid probe is adjustable), the detection of the small nucleic acid marker of the gastric cancer is realized by testing the Raman signal of the SERS probe on the SERS detection chip, the integrated detection of multiple nucleic acid biomarkers in complex environments such as serum and the like can be realized, and the detection specificity and accuracy are effectively improved.

The invention discloses an Ag nanowire / polyurethane flexible transparent conductive composite film with biocompatibility, electric conductivity and light transmission performance and a preparation method thereof, comprising the following steps of: preparing silver nanowires by a polyol method; Ag nanowire / polyurethane flexible transparent conductive composite films are synthesized by two-step method. The film prepared by the invention has certain electric conductivity and light transmission performance, and the silver nanorods are uniformly distributed on the surface of the polyurethane substrate; the transmittance of the composite film is about 45%. The average resistance is about 35 M OMEGA. The maximum tensile strength of the composite film is 1.819 MPa, the maximum tensile load is 3.082 N, and the maximum elongation at break is 824.280%. The composite film has excellent properties, and has broad application prospects in the field of photoelectric devices.

The invention discloses an Au ND@Ag NRs probe and a preparation method and application thereof. The Au NDC@Ag NRs is a cylindrical core-shell structure, and the Au NDC@Ag NRs is a core-shell structuresynthesized by growing gold nano bicones (Au NDCs) on gold seeds and then growing silver nanorods on the surfaces of the Au NDCs. Based on catalytic etching caused by Cr<6+>, the morphology of the AuNDC@Ag NRs is changed, and attenuation of surface plasma resonance (SPR) and red shift of an absorption spectrum are caused. Meanwhile, along with the increase of the concentration of the Cr<6+>, theAu NDC@Ag NRs shows obvious color change, namely, the Au NDC@Ag NRs becomes colorless finally from orange to pink and then to purple. Rapid and obvious red shift and obvious color change are generated through etching of the Au NDC@Ag NRs, different target object concentrations corresponds to different color changes, the concentration of a detection object can be easily determined by naked eyes, and high-sensitivity naked eye detection on the Cr<6+> is realized. According to the invention, a simple, rapid and sensitive multicolor colorimetric method for detecting the Cr<6+> is established.

The invention belongs to the technical field of photocatalytic materials and specifically relates to a silver nanorod-titanium dioxide composite material and its preparation method and use. It includes: silver nanorods and titanium dioxide particles, and the titanium dioxide particles are partially grown on the silver nanorods in situ. surface, and the other part is dispersed between the gaps of the silver nanorods. The weight ratio of the silver nanorods and the titanium dioxide is (0.0025~1):1, thereby providing a silver nanorod-titanium dioxide composite material that can effectively photocatalytically degrade gas phase pollutants and its preparation method and application.

The invention discloses a preparation method, product and application of a zinc oxide modified gallium nitride silver-loaded heterojunction photocatalyst. (GaN)1-x(ZnO)x solid solution gel is preparedby virtue of a sol-gel method, spin-coating of the (GaN)1-x(ZnO)x solid solution gel on the surface of a Si sheet growing on a crystal face (100) is carried out, treatment is conducted by virtue of ammonia gas to obtain a (GaN)1-x(ZnO)x solid solution nanorod, and then photodeposition Ag-loaded modification is conducted on the nanorod, and the Ag / (GaN)1-x(ZnO)x nanorod material is obtained. The catalyst is mainly characterized in that the structure of the catalyst is a silver-loaded heterojunction nanorod of zinc oxide modified gallium nitride; the specific one-dimensional nanorod heterojunction structure has a shorter longitudinal carrier migration path and an ultra-large specific surface area, electron hole separation and migration in the photocatalysis process are facilitated, and an optical excitation system can be utilized to the maximum extent. The catalyst product has the characteristics of being capable of effectively carrying out photocatalytic degradation on phenol and showing excellent photodegradation performance on phenol.

The invention belongs to the technical field of detection of trace organic pollutants, and particularly relates to preparation of a nanorod array with adjustable resonance wavelength and a method forquickly detecting trace hydrazine through utilization of the surface-enhanced Raman effect of a silver nanorod. A surface-enhanced Raman substrate comprises a substrate body, and metal silver is deposited on the substrate body, and forms the nanorod array with a forky top. By preparing an independent silver nanorod array thin film with the forky top, the substrate with an excellent surface-enhanced Raman effect is obtained, and then trace hydrazine is quickly detected through the utilization of the surface-enhanced Raman effect. The method is simple, quick, low in cost and high in sensitivity.

The invention discloses a random laser manufacturing method based on coupling of a silver nanorod metamaterial and a luminous body. According to the random laser, an aluminum sheet is used as a substrate, a silver nanorod metamaterial structure is used as a surface plasmon resonant cavity, Nile red fluorescent dye and a polymethyl methacrylate (PMMA) active layer are used as an optical gain dielectric layer, and then a slide is covered to prevent oxidation of the dye. The excitation surface plasmon nanometer resonant cavity mode is adjusted by changing the length of the silver nanorods, and then the random laser emission wavelength can be adjusted and controlled by means of selective enhancement of the longitudinal high-order nanometer resonant cavity mode. The random laser has the characteristics of being low in threshold value and high in output power, the emission wavelength of the random laser can be effectively regulated and controlled within a wide wavelength range, the researchfield and research direction of the random laser are enriched, and the random laser can be applied to sensing, photonic crystals and the like.

A surface enhanced Raman spectrum detection method combining a gel electrophoresis separation technology comprises the following steps of a, preparing a silver nanorod array using an inclined angle deposition technology; b. combining a gel electrophoresis technology to combine a substrate prepared in step a and a gel electrophoresis apparatus; c, adjusting a voltage and a current so that a mixtureto be tested is expanded according to different positions on the substrate; and d, using a surface-enhanced Raman spectrograph to detect surface-enhanced Raman spectrograms at the different positionson the substrate so as to distinguish different components in the mixture. By using the detection method, a detection process is simple, sensitivity is high, an enhanced effect is obvious, repeatability is good and large scale production can be performed. Characteristics of high efficiency of gel electrophoresis and high detection performance of silver nanorods can be fully used so as to achieveseparation detection of multiple similar mixtures, and the method can be applied to the separation detection of the multiple similar complex samples.

The invention discloses a sample platform capable of simultaneously preparing a surface-enhanced Raman substrate on a large scale, and belongs to the technical field of trace organic matter detection.The sample platform is used for preparing the surface-enhanced Raman substrate on a large scale. The sample platform comprises a supporting part and a boss-shaped circular ring, wherein the diameterof the upper part of the boss-shaped circular ring is larger than the diameter of the bottom part of the boss-shaped circular ring, and the surface of the boss is in an arc shape. The sample platformcan simultaneously deposit silver nanorods on a plurality of substrates using an inclined growth method. An array film formed by the multi-substrate silver nanorods has good product consistency, andthe production efficiency of the traditional preparation method can be improved.

The invention discloses an all-inorganic perovskite quantum dot coated silver nanorod composite silicon dioxide and cysteine multistage chiral luminescence enhanced composite material and a preparation method thereof, and belongs to the technical field of chiral luminescence material preparation. The preparation method comprises the following steps: reacting polyhydric alcohols to obtain a one-dimensional silver nanorod; then hydrolyzing TEOS and APTES to obtain AgNR (at) SiO2; then, stirring with a cysteine solution at room temperature to obtain an AgNR (at) SiO2 (at) L-cys compound; and finally, compounding the compound with all-inorganic perovskite quantum dots (QDs) prepared by a thermal injection method to prepare the AgNR (at) SiO2 (at) L-cys (at) QDs chiral luminescence enhanced composite material with a multi-stage nano structure. The material has a rod-like morphology, perovskite quantum dots are uniformly distributed on the surface, and AgNR (at) SiO2 (at) L-cys (at) CsPbBr3has 87 times of luminescence enhancement. The material has the advantages of low preparation cost, large-scale preparation, simple method, easiness in operation, good repeatability and the like.