37results about How to "Fast electron transfer rate" patented technology

The invention relates to a non-enzyme electrochemical transducer for detecting the glucose content on the basis of graphene/nanogold modified electrode (Gr-Au/GC). According to the non-enzyme electrochemical transducer for detecting the glucose, chloroauric acid (HAuCl4) and graphene (Gr) are used for preparing a modified electrode, the prepared modified electrode is extremely highly active on oxidation of the glucose, highly dispersed nanoparticles in the modified electrode provide large superficial area for electro-catalysis reaction, the detection sensitivity is improved, the electron transfer rate is increased, and analysis performance of the glucose is improved. According to the non-enzyme electrochemical transducer for detecting the glucose, the detection sensitivity of the glucose is high, the detection limit is low, and the detection range is wide.

The invention relates to method for preparing a functionalized composite nano-fiber modified electrode. The method specifically comprises the steps of (1) preparing a spinning solution; (2) preparing composite nano-fibers through electrostatic spinning so as to form a composite nano-fiber PA6-MWNTs modified electrode; (3) carrying out electrical-polymerization thionine functionalization on the composite nano fibers: soaking the composite nano-fiber PA6-MWNTs modified electrode into a polymerization solution containing thionine monomers PTH, applying a voltage to the modified electrode so as to carry out anodizing treatment, then, carrying out cyclic volt-ampere scanning, washing away the thionine monomers, adsorbed to the modified electrode, by using a phosphate buffer solution PBS, forming a functionalized composite nano-fiber electrode modification material PA6-MWNTs/PTH layer on the surface of the electrode after the polymerization reaction is ended, thus obtaining the functionalized composite nano-fiber PA6-MWNTs/PTH modified electrode. According to the method, a functionalized composite nano-fiber electrode modification material which has the characteristics of good stability, large specific surface area, good biocompatibility, high electron transfer rate, uniformly-distributed diameter and pore size, and the like is obtained.

The invention discloses a preparation method for a nanogold-nanofiber functional composite modified electrode. The preparation method specifically comprises the following steps of (1) preparing a spinning solution; (2) performing electrostatic spinning to prepare composite nanofibers to form a composite nanofiber PA6-MCWNTs modified electrode; and (3) performing functionalization on composite nanofibers through electro-deposition nanogold, namely immersing the composite nanofiber PA6-MCWNTs modified electrode into deposition liquid containing HAuCl4, reducing HAuCl4 into nanogold by adopting a multi-potential step change method, and synchronously and directly depositing the nanogold on the surfaces of PA6-MCWNTs composite nanofibers, thus obtaining the nanogold/nanofiber functional composite AuNPs-PA6-MCWNTs modified electrode. The preparation method can be used for obtaining a functional composite electrode modified material with the characteristics of high stability, large specific surface area, high biological compatibility, high electron transmission rate, uniform nano diameter aperture distribution and the like.

The invention discloses a method for detecting the glutathione concentration of a solution. According to the method, a three electrode system is used, cyclic voltammetry is adopted to measure the glutathione concentration of a solution to be measured, the glutathione concentration of the solution can be obtained through a glutathione linear equation; in the three electrode system, the work electrode is subjected to an aminated graphene quantum dot modification treatment, and the work electrode is a glass-carbon electrode. The method has the advantages of simple operation, quick detection, and high sensitivity, and is capable of high-sensitively recognizing glutathione in a mixed sample solution.

The invention discloses a method for detecting the concentration of nitrite ions in a solution. The method comprises the following steps: firstly, polymerizing carboxylated graphene with pyrrole to form carboxylatedgraphene-polypyrrole, and dissolving in a chitosan solution with the mass fraction of 0.5wt % to ultrasonically obtain a carboxylatedgrapheme-polypyrrole-chitosan mixed solution, titrating onto a glassy carbon electrode and drying to obtain a carboxylatedgrapheme-polypyrrole-chitosan modified electrode; secondly, taking the carboxylatedgrapheme-polypyrrole-chitosan modified electrode prepared by a step 1 as a working electrode, and detecting the concentration of nitrite ions in a solution to be detected through a differential pulse voltammetry by using a three-electrode system according to the differential pulse voltammetric curve of the nitrite ions. The method provided by the invention has the advantages of simple operation, rapid detection and high sensitivity, and the nitrite ions in the mixed sample solution can be sensitively recognized.

The invention discloses a BP (black phosphorus)-based modified electrode for detecting H2O2 and a preparation method of the modified electrode. Firstly, a pLL (polylysine) solution and a BP nanosuspension are mixed and left to stand, and a pLL-BP mixed solution is prepared; the pLL-BP mixed solution is dropwise added to the surface of a GCE (glassy carbon electrode), and a pLL-BP GCE composite electrode is formed; finally, the pLL-BP GCE composite electrode is soaked in a Hb (hemoglobin) phosphoric acid solution with the concentration of 1-4 mg/mL, the mixture is left to stand at the temperature of 0-4 DEG C for 8-14 h, and the BP-based modified electrode Hb-pLL-BP GCE is prepared. The modified electrode Hb-pLL-BP GCE is prepared with the simple preparation method and is accurate in detection result, high in detection sensitivity and good in selectivity when applied to electro-catalysis detection of H2O2.

The present invention provides for the selective covalent modification of nucleic acids with redox active moieties such as transition metal complexes. Electron donor and electron acceptor moieties are covalently bound to the ribose-phosphate backbone of a nucleic acid at predetermined positions. The resulting complexes represent a series of new derivatives that are bimolecular templates capable of transferring electrons over very large distances at extremely fast rates. These complexes possess unique structural features which enable the use of an entirely new class of bioconductors and photoactive probes.

The invention discloses a method for detecting tyrosine by using a chitosan-functionalized gold nano-modified glassy carbon electrode. The method comprises the following steps of (1) preparing a mixed liquid A, mixing the mixed liquid and a chitosan solution with the mass fraction of 0.5wt% at the volume ratio of 1:1, carrying out ultrasonic treatment, carrying out centrifugal treatment, taking sediments, dispersing the sediments into water at the mass-volume ratio of (5-8mg):1ml, carrying out ultrasonic treatment to obtain a micro-solution, titrating the micro-solution on the surface of the glassy carbon electrode and airing to obtain the chitosan-functionalized gold nano-modified glassy carbon electrode; and (2) adopting the chitosan-functionalized gold nano-modified glassy carbon electrode prepared from the step (1) as a working electrode, and detecting the concentration of tyrosine in a to-be-detected solution by using a differential pulse voltammetry of a three-electrode system according to a differential pulse voltammetry curve of the tyrosine. The method has the advantages of being simple in operation, fast in detection and high in sensitivity, and high-sensitivity recognition of the tyrosine in the mixed sample solution can be carried out.

The invention discloses modified nano zero-valent iron with a core-shell structure as well as a preparation method and application thereof, belongs to the technical field of heavy metal pollution remediation, and solves the technical problem that the existing nano zero-valent iron cannot completely overcome the defects of the nano zero-valent iron so as to remarkably improve the reduction removal efficiency of heavy metal ions. The invention discloses a preparation method of modified nano zero-valent iron with a core-shell structure, which comprises the following steps: chelating ferrous ions by adopting an amino carboxylic acid compound, adding a KBH4 solution into a mixed solution to form amorphous nano zero-valent iron, and reacting for a certain time to finally obtain the modified nano zero-valent iron with the core-shell structure. According to the method, the modified nanoscale zero-valent iron material with the core-shell structure can be prepared through one step and one modified material, and the preparation process is simple. The modified nano zero-valent iron with the core-shell structure obtained by the method is not easy to oxidize, weak in agglomeration effect, long in storage time, higher in electron transfer rate and higher in heavy metal ion removal efficiency.

The invention discloses a preparation method of a composite photocell. In the invention, an electrophoretic deposition method is firstly used to prepare ordered CuO-rGO (Copper Oxide-Graphene) nano-film in FTO conductive glass, and then, by controlling the hydrolysis rate of Cu2 (OH) 2CO3 colloid to regulate the self-assembly process of CuO nano-particles in conductive glass, the hierarchical porous structure in CuO thin film can be effectively controlled and applied to solar cells. At the same time, the photovoltaic cell fabricated by conductive glass with grid groove structure on the upper surface can ensure the photovoltaic conversion efficiency of the photovoltaic cell and reduce the wear of the platinum counter electrode. The composite photovoltaic cell of the invention has a hierarchical porous structure, which can increase the path of light, improve the light capture efficiency and enhance the service life of the solar photovoltaic cell.

The present invention provides for the selective covalent modification of nucleic acids with redox active moieties such as transition metal complexes. Electron donor and electron acceptor moieties are covalently bound to the ribose-phosphate backbone of a nucleic acid at predetermined positions. The resulting complexes represent a series of new derivatives that are bimolecular templates capable of transferring electrons over very large distances at extremely fast rates. These complexes possess unique structural features which enable the use of an entirely new class of bioconductors and photoactive probes.