410 results about "Rhodamines" patented technology

The invention discloses a ratio-type fluorescence analysis method for determining sodium dehydroacetate, which comprises the following steps: under an alkaline condition, synthesizing tetrafluoroterephthalic acid oxide, namely a fluorescent substance TFAox, by oxidizing tetrafluoroterephthalic acid with hydrogen peroxide, and forming a ratio-type fluorescence probe by the fluorescent substance and rhodamine B, a ratio-type fluorescence analysis method of sodium dehydroacetate is constructed based on the ratio-type fluorescence probe, and the method can be successfully applied to determination of sodium dehydroacetate in a water sample and a bread sample. The ratio-dependent fluorescence detection method for determining sodium dehydroacetate provided by the invention has the characteristics of wide linear range, high detection sensitivity, no interference of coexisting substances on determination, good selectivity and the like.

The present invention belongs to the technical field of mechanochromic materials, and specifically relates to a mechanochromic material containing rhodamine with a hydantoin structure, and its preparation method and application. The rhodamine mechanochromic material containing a hydantoin structure is shown in structure (I), with rhodamine B as the matrix, reduced to rhodamine alcohol, oxidized to generate rhodamine aldehyde, and reacted with hydantoin to prepare a six-membered spirocyclic rhodamine containing a hydantoin structure. The rhodamine compound containing a hydantoin structure involved in the present invention has good ion interference resistance, exhibits photochromic properties in a dichloromethane solvent, and has the properties of mechanical stress discoloration and solvent mixing stress discoloration with high contrast and good repeatability. The solid powder of the rhodamine mechanochromic material containing a hydantoin structure has the characteristic of changing color upon grinding. After the action of mechanical force, the color of the powder changes from yellow to pink, and a reversible color change is achieved during the grinding-heating process.

The invention relates to the technical field of medical chemistry, in particular to a bridge oxygen site regulatively modified rhodamine anti-cancer fluorescent compound as well as a preparation method and application thereof. The invention develops the rhodamine anti-cancer fluorescent compound of which the meso site is functionalized by tetraarylethene and the bridge oxygen site can be regulated and modified, the fluorescent compound has adjustable red light-near infrared fluorescence emission and excellent fluorescence quantum yield, and the quantum yield can be as high as 99%; the fluorescent compound specifically targets mitochondria, and mainly inhibits growth of tumor cells by inducing para-apoptosis; under irradiation of 655 nm near-infrared laser, ferroptosis is further triggered, efficient treatment of tumor cells is achieved through chemical-photodynamic synergistic effect, and a new treatment thought is provided for overcoming tumor drug resistance.

The invention discloses a green detection method for determining trace heavy metal ion pentavalent antimony-Sb (V) in water based on a rhodamine B-cloud point extraction-atomic furnace graphite absorption method. The rhodamine B is used as a complexing agent of Sb (V), so that the color development is sensitive, and the complexing is stable. According to the method, the nonionic surfactant Triton X-114 is used as the extraction agent, the cloud point temperature is low, a complex can be efficiently extracted, a micelle phase is formed, the extraction agent is easily and effectively separated from a water phase, cloud point extraction is carried out under ultrasonic assistance to enrich and concentrate trace antimony, the enrichment factor is high, matrix interference in a water sample to be detected can be effectively eliminated, and the detection precision of Sb (V) is improved. By adopting a cloud point extraction technology, the use amount of an organic reagent can be effectively reduced, and the waste liquid treatment cost is reduced. According to the method, other oxidation methods can be combined, total antimony can be measured based on complexing color development of Sb (V), valence state distribution of free antimony can also be measured, and the method has wide applicability.

The invention belongs to an advanced material technology, and relates to a novel rhodamine derivative, in particular to a 2-aminothiazolyl rhodamine 6G derivative as well as a preparation method and application thereof. Rhodamine 6G and 2-aminothiazole are used as raw materials, the 2-aminothiazolyl rhodamine 6G derivative RGAT is prepared through a one-step reaction, on one hand, RGAT shows excellent selectivity and very high sensitivity to Fe < 3 + >, fluorescence enhancement is remarkable, the linear range of Fe < 3 + > is wide, in the Fe < 3 + > concentration range of 0-50 M, a good linear relation with the Fe < 3 + > concentration is shown, and the detection limit is as low as 2.4 nM; on the other hand, the RGAT has better antibacterial performance on gram-positive bacteria and gram-negative bacteria than commercially available bleaching water, and the RGAT is very low in cytotoxicity, so that the RGAT has a good application prospect in the fields of environmental monitoring and biological medicine.

The invention belongs to the technical field of fluorescent probes, and particularly discloses a high-sensitivity visual Fe < 3 + > / Al < 3 + > fluorescent probe Rh and a preparation method and application thereof.The high-sensitivity visual Fe < 3 + > / Al < 3 + > fluorescent probe Rh is characterized in that cyanuric chloride and sulfanilic acid are used as raw materials, and an intermediate L1 is synthesized through an alkylation reaction; synthesizing an intermediate L2 by using the intermediate L1 and p-hydroxybenzaldehyde as raw materials through alkylation reaction; the intermediate L2 and rhodamine B hydrazide are subjected to a Schiff base reaction, and the triazine-rhodamine B hydrazide derivative fluorescent probe Rh is obtained. According to the fluorescent probe Rh prepared by the invention, the water solubility is increased due to the introduction of a sulfanilic acid group; the fluorescence spectrum test of the probe Rh and 17 common metal ions shows that the probe Rh has a remarkable fluorescence enhancement effect on Fe < 3 + > and Al < 3 + >; an ultraviolet-visible absorption curve test shows that a new peak appears at 560 nm, the absorbance is remarkably increased, and at 350 nm, Fe < 3 + > has an obvious absorption peak but Al < 3 + > does not exist, and Fe < 3 + > and Al < 3 + > can be distinguished.

The invention discloses a tetraarylethene modified rhodamine-like derivative as well as a preparation method and application thereof. The rhodamine-like derivative has a structure as shown in a formula I, rhodamine is taken as a core skeleton, a tetraarylethene (TAE) structure with AIE characteristics is introduced into a meso site of the rhodamine, RL-TAE series molecules are obtained, the defect of aggregation-induced quenching (ACQ) is greatly improved through the strategy, the molar absorption coefficient is obviously increased, and the rhodamine-like derivative has a good application prospect. Therefore, a new scheme is provided for developing high-brightness aggregation-induced emission dye. The rhodamine-like derivative disclosed by the invention is simple in preparation method, mild in reaction condition and high in yield, has the characteristics of AIE effect, high molar absorption coefficient and brightness, photobleaching resistance and diamagnetism, is an excellent concentration-brightness correspondence dye, and can realize efficient coding application.

The invention relates to the technical field of fluorescence detection, in particular to a cadmium-metal-based fluorescent metal organic framework material, a preparation method of the cadmium-metal-based fluorescent metal organic framework material, a fluorescent sensor array and application of the cadmium-metal-based fluorescent metal organic framework material. Fluorescent probe molecules with different proportions can be obtained by changing the doping concentration of rhodamine B, the RhB (at) MOF has an emission peak of Cd-MOF at 430nm and an emission peak of rhodamine B at 570nm, and when the material is in contact with different benzene series solvents, the relative emission intensity of host-guest emission peaks is almost constant, and the material is unique for each RhB (at) MOF, so that the fluorescent probe can be used for detecting the fluorescence of the RhB (at) MOF. Benzene, toluene, xylene and ethylbenzene are specifically distinguished by using different relative emission ratios of host and guest emission peaks, a fluorescent sensing array is constructed to identify benzene series, and fluorescent probe molecules can be prepared into a fluorescent film to realize portable detection.

The invention belongs to the field of intelligent high polymer materials, and provides a rhodamine force-induced color-changing luminescent material as well as a preparation method and application thereof. The molecular formula of the rhodamine mechanochromic luminescent material is any one of the following # imgabs0 #, and the rhodamine mechanochromic luminescent material has the characteristics of various evolution forms, various luminescent colors and strong sensitivity control on external force response, and the mechanochromic high polymer material prepared from the rhodamine mechanochromic luminescent material has strong processing adaptability, and can adopt the current mature commercial processing preparation means. In addition, according to the preparation method of the rhodamine force-induced color-changing luminescent material, a commercialized polymer material can be adopted as a matrix, the processing and preparation process is simple, practicability is high, and large-scale preparation can be achieved.

The invention discloses a preparation method of a bacterial cellulose / bismuth molybdate composite photocatalytic material, which comprises the following steps: firstly, carrying out alkali washing on in-situ growth bacterial cellulose, and freeze-drying for later use; shearing a certain amount of bacterial cellulose to prepare a bacterial cellulose suspension, and adding bismuth molybdate powder; carrying out ultrasonic full mixing, and carrying out vacuum filtration and hot pressing; and finally, preparing the bacterial cellulose / bismuth molybdate composite photocatalytic material. According to the invention, an in-situ growth and vacuum filtration method is adopted, so that the method is low in cost, green and pollution-free, and does not need high-temperature reaction; meanwhile, the bacterial cellulose / bismuth molybdate composite photocatalytic material is good in stability, can be recycled and has excellent photocatalytic performance, the degradation rate of rhodamine B can reach 70% or above within 150 min, and the degradation rate of the bacterial cellulose / bismuth molybdate composite photocatalytic material can still reach 50% or above after 5 times of experiments are cyclically repeated.

The invention provides a multiband electrochromic polymer, an electrochromic film, an electrochromic device and a preparation method of the multiband electrochromic polymer, and relates to the technical field of electrochromic materials.The preparation method of the electrochromic film comprises the steps that the multiband electrochromic polymer is dispersed in an organic solvent, and an electrochromic medium is obtained; preparing the electrochromic medium into an electrochromic film by adopting a spin coating method or a blade coating method; and the electrochromic film is placed in a dopant solution to be doped. The invention is beneficial to improving the defects of poor solubility and low optical contrast of the current polythiophene-based electrochromic molecule; and rhodamine electrochromic materials are poor in micromolecule film-forming property and easy to diffuse, and optical signal change is only limited to visible light band.

The invention discloses an IEF-11 / WO3-xS type heterojunction material with full spectrum response as well as a preparation method and application of the IEF-11 / WO3-xS type heterojunction material. The heterojunction is prepared by taking squaric acid, tetrabutyl titanate and WO3-x particles as raw materials, wherein the value range of x in WO3-x is 0 < = xlt; 1. The heterojunction material creatively realizes full-spectrum response from ultraviolet to near infrared through S-type energy band structural design, the separation efficiency of photo-induced electron-hole pairs reaches 2.47 times (compared with WO3-x) and 1.57 times (compared with IEF-11) due to a unique carrier transport mechanism, and strong redox sites are synchronously reserved, so that the material can be applied to the field of photoelectron-hole separation. And compared with a single-component material, the photocatalytic performance is improved by 3.74 times (compared with WO3-x) and 1.41 times (compared with IEF-11). Experiments show that under full-spectrum irradiation, the inactivation rate of the material to escherichia coli can reach 99%, the 120-minute degradation rate of the material to tetracycline (TC) reaches 86%, the material shows broad-spectrum degradation capacity to typical organic pollutants such as chlortetracycline (CTC), rhodamine B (RhB) and methylene blue (MB) in a visible region, and the 120-minute degradation efficiency reaches 77%, 53% and 95% respectively. The heterojunction material is prepared through a simple hydrothermal method, and has important application value in the fields of environmental governance, photocatalytic disinfection and the like.

The invention provides a fluorescent probe compound for simultaneously detecting HClO and ONOO <-> at two sites as well as preparation and application of the fluorescent probe compound. According to the probe compound, N, N-dimethylaminothioformyl ester is used as a response group of HClO, and the fluorescent probe RhB-ClO for simultaneously detecting HClO and ONOO <-> is constructed by expanding a conjugated structure of rhodamine. The probe shows excellent selectivity, high sensitivity (the detection limits are 9.9 nM and 13.1 nM respectively), good light stability and real-time responsiveness (the response time is 30 s and 150 s respectively) on HClO and ONOO <->. The probe not only can realize dual-channel imaging of HClO and ONOO <-> under oxidative stress conditions, but also can visualize the ferroptosis process of cells, a Parkinson's disease model and changes of HClO and ONOO <-> levels in an APAP-induced liver injury model. In addition, RhB-ClO can also be used for screening potential candidate drugs for nerve injury and liver injury, and it is proved that luteolin and piplongumine can be used as candidate antioxidant drugs.

A system for the synthesis of a cost-effective photocatalyst based on the FeOOH / CuBi2O4 heterostructure, consisting of: a) a CuBi2O4 synthesis plant for the production of CuBi2O4 (CBO) microspheres from Bi(NO3)3·6H2O and Cu(NO3)2.3H2O precursors; b) a heterostructure formation unit is configured to deposit FeOOH nanoparticles onto an outer surface of the CBO microspheres to form an FeOOH / CBO heterostructure; and c) a processing unit configured to wash and dry the FeOOH / CBO heterostructure to obtain the photocatalyst.

The invention discloses a polyacid-based metal viologen framework crystalline material as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalytic materials. The crystalline material is synthesized in one step through a hydrothermal method, the molecular formula is Cu2 (H2O) 2 (L) 2 [PW12O40] [OH]. 2H2O, the crystalline material belongs to a monoclinic system, the space group is P21, the cell parameters are alpha = 90 degrees, beta = 114.208 (2) degrees and gamma = 90 degrees, and the structure of the crystalline material is determined through X-ray diffraction. According to the material, accurate compounding of polyacid clusters and metal viologen on the molecular level is achieved, an effective electron transmission channel is constructed, separation of photon-generated carriers is remarkably promoted, and excellent photocatalytic activity is shown. At the ambient temperature, the crystalline material can be used as a catalyst to efficiently degrade dye pollutants (such as methylene blue and rhodamine B) in a water body, the degradation rate within 60 minutes exceeds 90%, and the crystalline material has good cycle stability and structural durability.

The invention discloses a reverse osmosis element repairing method. The method comprises the following steps: S1, carrying out acid-base cleaning and water washing on the reverse osmosis element which is damaged by oxidation; and S2, immersing the reverse osmosis element in a repair aqueous solution containing 4-(4, 6-dimethoxytriazine)-4-methylmorpholine hydrochloride, a polyamino compound, and rhodamine containing diamino or a derivative thereof, and washing with water to obtain the repaired reverse osmosis element. The desalination rate of the single reverse osmosis element repaired by the method can be recovered to 99% or above under standard test conditions, the repairing effect can be stably maintained for 3 months or above, and meanwhile, the high-pressure resistance and high-temperature resistance of the reverse osmosis element are further improved. The service life can be further prolonged and the operation and maintenance cost can be reduced when the method is applied to water treatment.

The present invention discloses a six-membered spirocyclic rhodamine copper ion fluorescent probe containing a benzothiazole hydrazine Schiff base structure, a preparation method thereof, and an application thereof. The six-membered spirocyclic rhodamine copper ion fluorescent probe containing a benzothiazole hydrazine Schiff base structure has the structural formula shown in (I). The preparation method comprises the following steps: weighing equimolar amounts of 2-aldehyde rhodamine B and 2-hydrazine benzothiazole, dissolving them in dry ethanol, heating to 80°C for reaction for 4 hours, cooling to room temperature, and distilling under reduced pressure. The obtained solid is purified by column chromatography to obtain a light pink solid, which is the six-membered spirocyclic rhodamine copper ion fluorescent probe containing a benzothiazole hydrazine Schiff base structure. The fluorescent probe of the present invention has good sensitivity to copper ions and can qualitatively and quantitatively detect copper ions in a solution.

This invention provides a composite aerogel based on Eucommia ulmoides gum and MXene nanosheets, its preparation method, and its application. The aerogel is prepared by reacting a toluene solution of Eucommia ulmoides gum with Ti3C2T... x MXene aqueous solution was mixed and a water-in-oil microemulsion was formed using a combination of ultrasound-assisted shaking. This allowed MXene nanosheets to self-assemble at the microemulsion droplet interface. Following vertical freezing and freeze-drying processes, a three-dimensional network structure of Eucommia ulmoides gum-Ti3C2T was successfully constructed. x MXene composite aerogel. The preparation method of this invention is mild and requires no chemical cross-linking agents. The resulting composite aerogel exhibits excellent adsorption performance for enrofloxacin, malachite green, Congo red, rhodamine, and kanamycin in water, with adsorption equilibrium times all within 10 minutes, enabling rapid removal of organic pollutants from water. This invention provides a new approach for the high-value utilization of Eucommia ulmoides gum and has promising application prospects in the field of water environment remediation.

The invention relates to the technical field of preparation of photocatalytic materials, in particular to a preparation method of a ZnWO4 and Bi2WO6 composite photocatalyst, which is characterized in that a monomer photocatalyst of ZnWO4 and a monomer photocatalyst of Bi2WO6 are respectively prepared by a hydrothermal method, and then a binary ZnWO4 / Bi2WO6 composite photocatalyst is prepared by a secondary hydrothermal method. The composite structure of the composite photocatalyst is beneficial to separation and transfer of photon-generated carriers, an organic pollutant rhodamine B solution with the concentration of 10 ppm can be degraded, excellent photocatalytic degradation performance is shown under excitation of visible light, and the preparation method is simple, easy to operate and suitable for application and popularization.

The invention discloses a g-C3N4 / vat yellow GCN composite photocatalyst and a preparation method thereof, g-C3N4 improves the photocatalytic performance of vat yellow GCN, efficient degradation of methyl orange and rhodamine B is realized by optimizing the ratio of g-C3N4 to vat yellow GCN, the degradation rate of methyl orange reaches 81%, and the degradation rate of rhodamine B is close to 100%; the active group involved in the process of degrading methyl orange by the g-C3N4 / vat yellow GCN composite photocatalyst is mainly. O < 2->; the g-C3N4 / vat yellow GCN composite photocatalyst has good photocatalytic stability, still has a good degradation effect on methyl orange after being used for three times, the degradation rate is higher than 80%, and the g-C3N4 / vat yellow GCN composite photocatalyst has good application prospects in the field of photocatalytic degradation of organic dye wastewater.

The invention discloses a mixed valence copper doped bismuth vanadate nanodisk photocatalyst and a preparation method and application thereof, a main body of the catalyst is a bismuth vanadate nanodisk, copper is doped in the bismuth vanadate nanodisk, and the copper is composed of Cu < + > and Cu < 2 + >; the catalyst has the characteristics of high stability, simplicity in implementation, high universality and the like. The doped copper ions not only can improve the light absorption capacity of the bismuth vanadate material, but also can promote the rapid separation of photo-induced electrons and holes of the bismuth vanadate material by virtue of the mixed valence state of the copper ions, and improve the carrier dynamics on the material, so that the photocatalytic efficiency of the bismuth vanadate material is improved. The bismuth vanadate photocatalyst doped with the copper ions in the mixed valence state has an efficient photocatalytic degradation effect on pollutants such as rhodamine B and the like, and has a wide application prospect in the technical aspects of environmental pollutant degradation and green advanced oxidation.

The application describes chromogenic conjugates for color-based detection of targets. The conjugate includes a chromogenic moiety such as rhodamine, rhodol or fluorescein. The chromogenic moiety is linked to a peroxidase substrate. The chromogenic conjugate can be used for immunohistochemical analysis and in situ hybridization. The conjugate can be used to detect 1, 2, 3 or more targets in a sample by color.

The invention discloses Cu / CuO / Ag nano-particles and a preparation method and application thereof, and the method successfully prepares the Cu / CuO / Ag nano-particles with regular morphology and uniform dispersion by optimizing a dual-stabilizer system and a step-by-step reduction-replacement process. The material has dual functions of SERS enhancement and catalysis: as an SERS substrate, the enhancement factor of rhodamine 6G reaches 5.3 * 10 < 8 >, the detection limit is as low as 5.0 * 10 <-13 > mol / L, and the reproducibility is good (RSD = 6.2%); meanwhile, as a catalyst for hydrazinolysis and reduction reaction, by optimizing a reaction solvent and the pH value of a system, the reaction efficiency is remarkably improved, and an additional incubation step is not needed. The detection limit on the plasticizer DOTP can reach 2.0 * 10 <-9 > mol / L, and the method has the advantages of simplicity and convenience in operation, good reproducibility, high analysis speed and the like, and is suitable for rapid screening and quantitative analysis of plasticizers in food packaging, environmental water bodies and medical instruments.

The invention provides spherical lignin-phenolic resin, a preparation method thereof and application of the spherical lignin-phenolic resin in adsorption of N-containing organic dye, and belongs to the technical field of adsorption materials. The lignin-phenolic resin with the regular spherical morphology can be prepared through a one-step condensation polymerization reaction by taking lignin, hydroquinone and trioxymethylene as raw materials under an acidic catalysis condition and adopting a reversed-phase suspension polymerization method, the lignin belongs to a renewable resource and has the characteristics of low cost and environmental friendliness, and the lignin-phenolic resin can be used for preparing the lignin-phenolic resin with the regular spherical morphology. The phenolic resin can replace phenols to become a main phenol source, the substitution rate can reach 75%, and the yield of the synthesized phenolic resin reaches up to 60-80%. Besides, abundant phenolic hydroxyl groups, sulfonic acid groups and other oxygen-containing groups can be introduced into the resin by selecting the types of monomers, the cross-linked structure of the resin is changed by regulating and controlling the proportion of the monomers, the adsorption capacity of N-containing organic dyes is effectively improved, and efficient adsorption of rhodamine B and methylene blue can be achieved.

The invention discloses a preparation method and application of a long afterglow photocatalyst based on a precious metal nanoparticle and aluminosilicate compound, and belongs to the technical field of catalysis. And after the Pr < 3 + >-doped calcium aluminum silicate matrix is irradiated by 254nm ultraviolet light for 10 minutes, long afterglow which is more than 1 hour is obtained in the Pr < 3 + >-doped calcium aluminum silicate matrix. Precious metal nano particle loaded aluminosilicate long afterglow fluorescent powder is used for improving afterglow luminescence. The loaded noble metal nanoparticles can enhance the afterglow luminescence of the aluminosilicate long afterglow fluorescent powder and prolong the afterglow luminescence time. The afterglow luminescence of the precious metal-loaded aluminosilicate long afterglow fluorescent powder is used as a light source to degrade organic pollutants in a dark environment, the degradation efficiency of rhodamine B reaches 40%, the degradation efficiency of tetracycline hydrochloride reaches 15%, the degradation efficiency of ciprofloxacin reaches 20%, and the degradation efficiency of the precious metal-loaded aluminosilicate long afterglow fluorescent powder reaches 20%. The result shows that the aluminosilicate long-afterglow fluorescent powder loaded by the noble metal nanoparticles has excellent degradation capability.

The preparation method comprises the following steps: firstly, dissolving gelatin in deionized water to form a gelatin solution, adding rhodamine B and a catalyst, and carrying out amidation reaction to chemically bond amino groups of the gelatin with carboxyl groups of the rhodamine B; then adding a cross-linking agent to cross-link the rhodamine B-gelatin conjugate into nano particles, and enabling the rhodamine B-gelatin fluorescent nano thermometer to be ellipsoidal by utilizing centrifugal force formed by high-speed stirring in the cross-linking process. The rhodamine B is firmly loaded on the gelatin nanoparticles, the loading capacity of the rhodamine B is greatly increased, the residence time of the rhodamine B in an organism is prolonged, the photobleaching effect of the rhodamine B is overcome, the rhodamine B-gelatin fluorescent nanoparticles are prepared into ellipsoids through uneven stress under the action of centrifugal force when aggregated particles are formed, and the rhodamine B-gelatin fluorescent nanoparticles are prepared into the ellipsoids. The preparation method is simple, the temperature measurement sensitivity is high, the photobleaching phenomenon of rhodamine B is effectively weakened, and the biomedical utilization prospect is good.

The invention relates to the technical field of high polymer materials, particularly discloses a photochromic TPEE thermoplastic elastomer, and also discloses a preparation method and application thereof. The photochromic TPEE provided by the invention is prepared from the following raw materials: purified terephthalic acid, 1, 4-butanediol, a polyether soft segment and a photochromic small molecule, and the photochromic small molecule is Rh6G-2OH. According to the TPEE with the photochromic function, the material structure comprises rhodamine micromolecules, the micromolecules have a spirolactam structure, and based on the structure, the elastomer material provided by the invention has the photochromic function. After being illuminated by ultraviolet rays, the elastomer material can absorb ultraviolet ray energy to generate a light response behavior, so that the material is discolored.

The application relates to a surface enhanced Raman detection technology, in particular to a spherical composite SERS substrate and a preparation method and application thereof. The method comprises the following steps: adopting a micro flow injection pump to drop a solution containing silver nanowires and gold nanorods into liquid nitrogen, and then performing freeze drying; wherein, a gun head of the micro flow injection pump is a hydrophobic gun head; the concentration of the silver nanowires in the solution containing the silver nanowires and the gold nanorods is 15-40 mg / mL. The spherical composite SERS substrate prepared by the method has a spherical structure formed by silver nanowires and metal nanorods, the spherical skeleton structure is formed by interweaving silver nanowires into a net, and the metal nanorods are loaded on the silver nanowires, and the spherical composite SERS substrate can realize detection of rhodamine 6G without introducing a modifier.

The application provides a polyimide photocatalytic fiber and a preparation method and application thereof, and the polyimide photocatalytic fiber comprises a polyimide fiber and photocatalytic polyimide loaded on the surface of the polyimide fiber; in the application, the photocatalytic polyimide is loaded on the surface of the polyimide fiber, the problem that the polyimide fiber does not have photocatalytic function is solved, the affinity between the two is high, and problems such as peeling and falling of the photocatalytic material do not occur; the stability and durability of the photocatalytic fiber are improved; under the premise that the mechanical properties of the fiber are not affected, the photocatalytic fiber has excellent photocatalytic effect and high degradation efficiency on photodegradable compounds, such as rhodamine.