20 results about "Silver nanorods" patented technology

The invention relates to the technical field of materials adaptive to extreme environments, and discloses cross-scale gradient co-doped multifunctional composite aerogel as well as a preparation method and application of the cross-scale gradient co-doped multifunctional composite aerogel. The multifunctional composite aerogel is co-doped with ultraviolet light-screening agent nano-particles, infrared light-screening agent nano-particles and functional nano-particles in a cross-scale gradient manner, and is used for performing selective filtration and full-spectrum regulation and control on sunlight penetrating through the transparent aerogel; the ultraviolet light-screening agent particles are titanium dioxide nano particles; the infrared opacifying agent particles are indium tin oxide nanoparticles; and the functional nanoparticles are silver nanorods. The composite aerogel provided by the invention improves the anti-ultraviolet performance and high-temperature heat insulation performance of the aerogel and provides a function of enhancing photosynthesis of plants, and meanwhile, the transmittance of the transparent aerogel in the visible light band of sunlight is not obviously reduced.

The invention relates to the field of electronic paste, and provides high-performance electronic paste based on a graphene composite material and a preparation method of the high-performance electronic paste. The slurry comprises a surface modified graphene / silicon carbide nanowire hybrid, a carbon-coated silver nanorod, epoxy resin, a polyamide curing agent, a KH-550 coupling agent, polyvinylpyrrolidone, fumed silica, polyether modified polydimethylsiloxane and a compound solvent. By constructing a multi-scale conductive network and an interface enhancement structure, excellent conductivity and shear strength of the slurry are realized. The preparation method comprises the steps of in-situ synthesis and surface modification of the graphene hybrid filler, deposition preparation of the carbon and silver nanorods, and a multi-stage dispersion compounding process of all the components under specific temperature control and shearing conditions, and finally the electronic paste which is stable in structure and excellent in performance is formed and is suitable for scenes such as high-reliability electronic packaging and conductive bonding.

The invention discloses a surface-enhanced Raman probe as well as preparation and application thereof. The surface-enhanced Raman probe comprises a silver nanorod and a 4-amino thiophenol molecular layer adsorbed on the surface of the silver nanorod, pATP molecules and the surface of the silver nanorod form an Ag-S bond through sulfydryl (-SH) to form AgNRs (at) PATP, the two AgNRs (at) PATP molecules easily form a corresponding azo compound DMAB, and a pi-pi conjugated structure between the DMAB and nitro explosive molecules can effectively promote electron transfer, combine into AgNRs (at) PATP (at) TNT and generate a hot spot signal, so that a Raman signal is enhanced, the detection limit is reduced, the accuracy is high, and the method is suitable for industrial production. The trace detection of the nitro explosives is realized.

Provided are a Surface-Enhanced Raman Scattering (SERS) biosensor based on a Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) / Cas13a system and an application thereof, belonging to the field of spectroscopy detection. The SERS biosensor includes an SERS sensor chip, a first reagent, a second reagent, a third reagent, and a fourth reagent. The SERS sensor chip is a silver nanorod array substrate with hairpin Deoxyribonucleic Acid (DNA) single-stranded H1 and blocking molecule 6-mercaptoethanol modified on the surface. The first reagent is a SERS probe and buffer of the probe. The second reagent is hairpin nucleic acid aptamer strand MUC1-apt aqueous solution. The third reagent is the CRISPR / Cas13a system and buffer of the system. The fourth reagent is hairpin DNA single-stranded H2 aqueous solution. The above reagents are mixed with the gastric cancer exosomes to be detected and then dripped on a surface of the SERS sensor chip.

A photoelectric conversion element including a thin film composed of a transition metal dichalcogenide and formed on a base material. In the present invention, a surface of the thin film composed of the transition metal dichalcogenide is modified with at least any nanorod particles of Au nanorod particles composed of Au and Ag nanorod particles composed of Ag. An average aspect ratio of the Au nanorod particles is 3.0 or more and 12.0 or less, and an average aspect ratio of the Ag nanorod particles is 3.0 or more and 13.0 or less. In the invention, the sensitivity to light having wavelengths in the near-infrared region improves by a sensitizing action attributed to localized surface plasmon resonance that is developed by the Au and Ag nanorod particles.

The invention discloses a nano-silver film with an adjustable melting point and a preparation method of the nano-silver film. The method comprises the following steps: firstly, preparing a silver nanorod mother solution; mixing the obtained silver nanorod mother liquor with a detergent in proportion, and carrying out stirring washing and flocculation treatment; and the silver nanorod dispersion liquid obtained through final washing is transferred into a filter pressing device to be subjected to filter pressing and film forming, and the preliminarily-formed nano-silver film is obtained. And then, the prepared silver film is subjected to rolling treatment to achieve surface flattening, and then the silver film is placed in an environment with the temperature being 80-120 DEG C to be dried so that the silver film can be fully dehydrated. After drying is completed, the silver film can be directly stripped from the filter paper substrate, the stripped nano-silver film is subjected to cold pressing treatment, and the final nano-silver film is obtained. And the content of residual organic matters on the surface of the silver nanorod can be changed by regulating and controlling the washing times and the washing agent, so that the melting point of the nano-silver film is regulated and controlled.

The invention belongs to the technical field of materials, and discloses a plasmon all-silver nanocavity for regulating and controlling exciton luminescence of a two-dimensional material and a preparation method of the plasmon all-silver nanocavity. The plasmon all-silver nanocavity comprises a silver micron plate and a silver nanorod loaded on the silver micron plate, and the surface of the silver nanorod is coated with a silicon oxide layer. According to the plasmon all-silver nanocavity, an all-silver framework is adopted, the material advantages of low ohmic loss and large optical cross section of silver in the visible light wave band are fully utilized, and the quality factor and the light field localization capability of the nanocavity are remarkably improved.

The present invention provides silver nanoparticles and a method for preparing silver nanoparticles by a polyol reduction method regulated by quinone compounds, belonging to the technical field of nanomaterial preparation. The present invention mixes quinone compounds, poly N-vinyl pyrrolidone, a silver source, an additive and a polyol compound to obtain a mixed raw material liquid; the amount ratio of quinone compounds, poly N-vinyl pyrrolidone, a silver source, an additive and a polyol compound is (0.02-0.25) mol: (0.01-2) mol: (0.01-0.1) mol: (0.00001-0.0001) mol: 1L; the mixed raw material liquid is subjected to a reduction reaction under the conditions of 110-180° C. to obtain right triangular bipyramidal silver nanoparticles and / or pentagonal silver nanorods. The present invention adopts a one-pot method to prepare right triangular bipyramidal silver nanoparticles and / or pentagonal silver nanorods, which is simple to operate and has high preparation efficiency.

The invention relates to a coating with an optical colorful effect, a protective layer applying the coating and application, and relates to the technical field of automobile material processing. Preparation raw materials comprise the following components in parts by mass: 45 to 55 parts of photochromic material loaded porous core-shell structure nanoparticles, 8 to 12 parts of silver nanorods, 15 to 20 parts of acrylic resin, 1 to 2 parts of a surfactant, 0.5 to 1 part of glutaraldehyde, 0.1 to 0.3 part of glacial acetic acid, 0.5 to 1.5 parts of a fluorocarbon silane coupling agent and 30 to 40 parts of a solvent. The protective layer comprises a fluorocarbon hydrophobic protective layer, a self-repairing layer and an optical colorful layer which are arranged in sequence, and the protective layer is applied to the color-changing self-repairing car cover. The coating prepared by the invention has the effect of beautifying and self-repairing the appearance of the car cover, and the car cover presents an appearance with an optical colorful effect and also has good tensile property, aging resistance and self-repairing performance.

The invention discloses a capillary SERS (Surface Enhanced Raman Scattering) sensor based on CRISPR / Cas13a (Clustered Regularly Interspaced Short Palindromic Repeats / CRISPR associated 13a), a preparation method of the capillary SERS sensor and application of the capillary SERS sensor to detection of a hepatocellular carcinoma marker miR-221, the method comprises the following steps: 1) adopting a seed growth method, firstly synthesizing a decahedral gold nano seed, and on the basis, continuing to react and grow to obtain dumbbell-shaped gold and silver nano rods (DS Au-AgNRs); (2) dispersing the DS Au-AgNRs prepared in the step (1) into a PVP ethanol solution, and assembling the DS Au-AgNRs onto an aminated capillary tube by utilizing the interaction of PVP groups on the surfaces of nano-particles and amino groups on the inner wall of the capillary tube, so as to obtain a capillary tube SERS (Surface Enhanced Raman Scattering) substrate; and 3) modifying the surface of the capillary SERS substrate prepared in the step 2) with a single-stranded DNA modified with sulfydryl and Raman signal molecules (Cy5) through a gold-sulfur bond to construct the SERS sensor.The capillary SERS sensor provided by the invention has the advantages of high sensitivity, high specificity, convenience in sampling, low cost and the like, and is expected to provide a novel method with a prospect for early diagnosis of HCC.

The invention discloses a preparation method of a silver-based high-reflectivity back electrode material, and relates to the technical field of electronic materials. An acid modified copper plate is used as an electrode material substrate, positively charged polystyrene microspheres are adsorbed and are autonomously arranged to form a seed layer, then generated silver nanorods are effectively fixed on the surface of the copper plate by means of gaps among the polystyrene microspheres and negative charges on the surface of the copper plate, and then in the SnCl4 atmosphere, the silver nanorods are effectively fixed on the surface of the copper plate. Plasma enhanced heating treatment is carried out, a silver nitrate solution is gradually converted towards the direction of nano-silver crystals along with solvent removal, nano-silver and Sn elements are combined under the combined action of plasma and a high-temperature environment, polystyrene microspheres are heated and removed along with the prolonging of reaction time, a nano-rod array is formed, total reflection of light can be reduced, and the light emitting efficiency is improved. The light scattering is increased, the light extraction rate of the LED is effectively improved, meanwhile, due to the existence of the Sn element, the contact between sulfide and silver can be reduced, and the possibility of vulcanization of the electrode material is reduced.

A surface-enhanced Raman detection chip for the detection of organic environmental pollutants and a preparation method thereof. The chip includes silver nanorods in the upper layer, boron nitride in the middle layer, and silver nanorods in the lower layer. The growth directions of the silver nanorods in the upper layer and the silver nanorods in the lower layer are opposite, and both grow towards the boron nitride layer. The method includes the following steps: In an electron beam evaporation system, a silver nanorod array structure is prepared on a clean substrate by using the inclined angle deposition technique, that is, the silver nanorods in the upper layer of the chip are obtained; a boron nitride layer is prepared to obtain a BN@AgNR substrate; in the electron beam evaporation system, an AgNR@BN@AgNR is obtained by using the inclined angle deposition technique. The method has a simple process, and the prepared chip can greatly enhance the SERS effect, enhance the SERS signal, thereby improving the SERS detection sensitivity, reducing the detection limit, and can be widely applied to the field of organic environmental pollutant detection.

A SERS-electrochemical dual-mode sensor for miRNA detection, a preparation method thereof and an application thereof, wherein the SERS sensing mode is realized by extracting the intensity of the SERS characteristic peak of methylene blue MB, and the electrochemical sensing mode is realized by testing the MB peak current by square wave voltammetry; the sensing substrate is obtained by modifying a hairpin DNA single strand and an auxiliary strand on the surface of a silver nanorod array substrate, and when the target miR-106a is present, a stable LW / T / DNAzyme three-strand complex is formed on the substrate surface with the first reagent DNAzyme and the auxiliary single strand LW in the sensing substrate; then, under the activation of the second reagent, the first reagent is triggered to cut the hairpin DNA single strand H1 in the sensing substrate on the substrate surface, and the remaining H1 fragment after cutting further binds to a SERS / electrochemical dual-mode probe modified with a signal molecule methylene blue MB, thereby outputting SERS and electrochemical signals. The dual-mode sensor detects miR-106a in serum at attomole and femtomolar levels, respectively, meeting the requirements of high sensitivity and reliable detection.

The invention discloses a magnesium alloy surface multi-response self-repairing long-acting coating as well as a preparation method and application thereof, and relates to the technical field of surface modification. The method comprises the following steps: carrying out hydrothermal reaction on the surface of magnesium alloy to obtain in-situ growth Mg (OH) 2; carrying out electrophoretic deposition on polydopamine on the in-situ grown Mg (OH) 2; preparing nano-particles in which the silver nanorods are wrapped by silicon dioxide and dopamine is loaded; the preparation method comprises the following steps: uniformly dispersing nano-particles in a polycaprolactone solution to obtain a polycaprolactone solution containing the nano-particles; the polydopamine is coated with a polycaprolactone solution containing nano-particles, and then the multi-response self-repairing long-acting coating is prepared on the surface of the magnesium alloy. The composite coating with good inorganic-organic binding force is constructed on the surface of the magnesium alloy based on early warning of Mg (OH) 2 and responding to Mg < 2 + >, pH and near-infrared light (NIR) to realize lasting and stable multi-protection, and the coating not only can realize a long-acting anti-corrosion function, but also has deicing and marine antifouling functions.

This invention discloses a full-cycle photothermal-magnetic responsive intelligent antibacterial system based on silver nanorods combined with mesoporous iron(III) oxide and an antibacterial agent, its preparation method, and its application. Specifically: 1) Silver nanorods (AgNRs) are prepared using a solvothermal method, and used as the core. A mesoporous iron(III) oxide (MesoFe3O4) shell is constructed on their surface using a template method to obtain AgNRs@MesoFe3O4 material; 2) The antibacterial agent is loaded into the material in step 1 using a cyclic ultrasonic impregnation-low temperature air drying process; 3) A PBS solution of the AgNRs@MesoFe3O4 material loaded with the antibacterial agent is prepared, and after treatment, a full-cycle photothermal-magnetic responsive intelligent antibacterial system is obtained. The antibacterial system can achieve biofilm destruction and antibacterial agent release through external magnetic field driving and infrared light dual response. The AgNRs in the antibacterial system maintain a long-term antibacterial environment by slowly releasing silver ions, thus achieving full-cycle antibacterial activity.

The invention belongs to the field of spectroscopy detection, and relates to an SERS (Surface Enhanced Raman Scattering) biosensor and a preparation method and application thereof, in particular to an SERS biosensor based on a CRISPR / Cas13a system and a DNAzyme signal amplification strategy, a preparation method of the SERS biosensor and application of the SERS biosensor in preparation of a nucleic acid detection kit, especially application of the SERS biosensor in preparation of a gastric cancer exosome nucleic acid detection kit. The SERS biosensor comprises an SERS sensing chip, a first reagent and a second reagent, the SERS sensing chip is a silver nanorod array substrate modified with a tetrahedral DTP probe; the first reagent is an SERS probe, a buffer solution of the SERS probe and a ZnSO4 solution; the second reagent is a CRISPR / Cas13a system and a buffer solution thereof; the reagents and a nucleic acid sample to be detected are mixed and then dropwise added to the surface of an SERS sensing chip, and high-sensitivity accurate detection of nucleic acid such as gastric cancer exosome nucleic acid is realized by virtue of a CRISPR / Cas13a system, a DNAzyme signal amplification strategy and SERS enhancement performance of a silver nanorod array substrate.

Disclosed are an SERS biosensor based on a CRISPR / Cas13a system and use thereof. The SERS biosensor comprises an SERS sensing chip, a first reagent, a second reagent, a third reagent, and a fourth reagent. The SERS sensing chip is a silver nanorod array substrate with a surface modified with a hairpin-type DNA single chain H1 and a closed molecule 6-mercaptohexanol. The first reagent is an SERS probe and a buffer thereof. The second reagent is a hairpin-type nucleic acid aptamer chain MUC1-apt aqueous solution. The third reagent is a CRISPR / Cas13a system and a buffer thereof. The fourth reagent is a hairpin-type DNA single-chain H2 aqueous solution. The reagents and a gastric cancer exosome sample to be detected are mixed and then dropwise added to the surface of the SERS sensing chip, and sensitive and accurate detection of gastric cancer-related exosomes is achieved by means of the CRISPR / Cas13a system, catalytic hairpin assembly, and SERS enhancement performance of the silver nanorod array substrate.

The invention provides a microneedle patch for closed-loop management of drug-resistant bacteria infected wounds of animals as well as a preparation method and application of the microneedle patch. According to the micro-needle patch, silk fibroin / hyaluronic acid composite hydrogel serves as a matrix, silver nanorods with specific local surface plasmon resonance (LSPR) characteristics are loaded, and wound pH real-time monitoring and near-infrared two-zone (NIR-II) photo-thermal sterilization functions based on surface enhanced Raman spectroscopy (SERS) can be achieved. The microneedle structure can penetrate into the deep layer of the wound, and precise delivery and treatment are achieved. According to the invention, monitoring and treatment are integrated, a closed-loop management system is formed, and the diagnosis and treatment efficiency and healing quality of wounds infected by drug-resistant bacteria of animals are remarkably improved. The patch has good wound pH monitoring ability, antibacterial effect and wound healing ability, and an efficient and safe solution is provided for treatment of drug-resistant bacteria wounds of animals.

This invention discloses a multi-responsive self-healing long-lasting coating for magnesium alloy surfaces, its preparation method, and its application, relating to the field of surface modification technology. The method includes a hydrothermal reaction on a magnesium alloy surface to obtain in-situ grown Mg(OH)₂; electrophoretic deposition of polydopamine on the in-situ grown Mg(OH)₂; preparation of silica-encapsulated silver nanorods loaded with dopamine nanoparticles; uniform dispersion of the nanoparticles in a polycaprolactone solution to obtain a polycaprolactone solution containing nanoparticles; and coating the polydopamine with the polycaprolactone solution containing nanoparticles, thus forming a multi-responsive self-healing long-lasting coating on the magnesium alloy surface. This invention constructs an early warning system based on Mg(OH)₂ on the magnesium alloy surface, responding to Mg… 2+ A composite coating with good inorganic-organic bonding achieves durable and stable multi-layer protection through pH and near-infrared light (NIR). This coating not only provides long-lasting corrosion protection but also has de-icing and marine antifouling functions.

This invention discloses a silver nanorod@mesoporous iron(III) oxide composite heterogeneous hydrogel material with bone-promoting and intelligent anti-infection functions, its preparation method, and its application. Specifically: 1) AgNRs are prepared, and a MesoFe3O4 shell is constructed on their surface using a template method to obtain AgNRs@MesoFe3O4; 2) Antibacterial agents are loaded into AgNRs@MesoFe3O4 using cyclic ultrasonic impregnation-low-temperature vacuum drying; 3) A sodium alginate solution containing drug-loaded AgNRs@MesoFe3O4 is poured into the bottom layer of a mold to obtain a nanomaterial layer, and a mixed solution containing AlgMA and sodium alginate is poured into the top layer; 4) UV curing and Ca2+ curing are performed. 2+ The solution impregnation method achieves dual in-situ gelation of the above solution. The solution is impregnated in a solution containing osteogenic drugs, rinsed, dried, and sterilized by irradiation to obtain a heterogeneous hydrogel. This material disrupts biofilms and kills bacteria, exhibiting both antibacterial and osteogenic functions.