34results about How to "Small residual current" patented technology

The invention discloses a preparation method of a uricase-modified titanium diboride composite paste electrode sensor. The preparation method is characterized by comprising the following steps: firstly preparing a nano-TiB2 / carbon nanotube composite paste electrode from nano-TiB2, oxidized carbon nanotubes and 1-propenyl-3-methylimidazolium tetrafluoroborate; carrying out surface modification on the nano-TiB2 / carbon nanotube composite paste electrode by virtue of 3-chloropropyltrimethoxysilane, so as to obtain a 3-chloropropyltrimethoxysilane-modified nano-TiB2 / carbon nanotube composite pasteelectrode; and modifying the 3-chloropropyltrimethoxysilane-modified nano-TiB2 / carbon nanotube composite paste electrode by virtue of uricase stationary liquid prepared from a Tris buffer solution, gelatin and bovine serum albumin, so as to obtain the uricase-modified titanium diboride composite paste electrode sensor, wherein the pH value of the Tris buffer solution is 8.5. The electrode sensor prepared by virtue of the preparation method has higher conductivity than a common carbon paste electrode, has specific recognition ability to uric acid and is high in sensitivity.

The invention discloses a preparation method of a sulfonamide-biotin modified indium nitride paste electrode sensor, which is characterized in that nano-indium nitride, graphene oxide, 1-aminopropyl-3-methylimidazolium bromide, mineral oil and amyl alcohol to prepare indium nitride paste electrode sensor; using triethylenetetramine and carbon quantum dots to modify indium nitride paste electrode, to prepare triethylenetetramine / quantum dot modified indium nitride paste electrode; then, In the reactor, add, phosphate buffer solution: 92~96%, sulfabiotin: 4~8%, dissolve, put triethylenetetramine / quantum dot modified indium nitride paste electrode into the solution, room temperature Stir and soak for 2 hours, take out the electrode, wash, and dry to obtain the sulfonamide-biotin-modified indium nitride paste electrode sensor. The electrode sensor has higher electrical conductivity than ordinary carbon paste electrodes, has specific recognition for proteins, and has high sensitivity.

The invention discloses / a preparation method and application of a nano-platinum-doped / enzyme-modified carbon paste electrode, which is characterized in that: the carbon paste electrode is doped with nano-platinum ions, and 1-ethyl-3-methylimidazole tetra Fluoroborate is used as an adhesive to prepare a carbon paste electrode by mixing carbon nanotubes and graphite powder, and then modify the carbon paste electrode with methyltransferase to obtain a nano-platinum-doped / enzyme-modified carbon paste electrode. Compared with ordinary carbon paste electrodes, the conductivity is improved by 1~2 times, and the electrochemical window is wide, the preparation method is simple, the cost is low, the surface is easy to renew, and the residual current is small; the electrode is used to quickly detect SAM in the sample, and the method has high sensitivity. Good selectivity, short response time, less interference, superior to other detection methods, is a simple, fast, convenient and easy SAM determination method, the fixed methyltransferase electrode sensor prepared by the application has low cost, simple preparation process, specific It has good performance and has the potential to realize automatic on-site determination.

The invention discloses a preparation method of a superoxide dismutase modified vanadium nitride paste electrode sensor, characterized by comprising the following steps: firstly preparing a nano VN / graphene compound paste electrode by adopting nano VN, graphene oxide and N-ethyl-3-picoline hexafluorophosphate; then modifying the nano VN / graphene compound paste electrode by adopting gamma-aminopropyl triethoxysilane, so as to obtain an aminopropyl triethoxysilane modified electrode; finally, dissolving bovine serum albumin and superoxide dismutase by adopting a phosphate buffer solution to prepare a superoxide dismutase immobilizing liquid; and then dripping the superoxide dismutase stationary liquid onto the aminopropyl triethoxysilane modified electrode, so as to prepare the superoxidedismutase modified vanadium nitride paste electrode sensor. The electrode has the advantages of being improved in conductivity in comparison with common carbon paste electrodes, wide in electrochemical window, simple in preparation method, low in cost, easy to update in surface, and small in residual current. A detection superoxide radical is high in sensitivity and good in selectivity.

The invention discloses a preparation method of a calcium-doped silicon nitride graphene paste electrode sensor, which is characterized in that, firstly, 1-butyl-3-methylimidazole p-toluenesulfonate is used to dissolve calcium gluconate and absorbent cotton to prepare The light yellow viscous liquid obtained is calcium-doped carbon-containing quantum dot adhesive; in an agate mortar, gold-modified silicon nitride: 34-38%, graphene oxide: 28-32%, calcium-doped carbon-containing Quantum dot adhesive: 10~14%, ammonium polyacrylate: 3~5%, ethanol: 14~20%, grind evenly, put it into a glass tube with an inner diameter of Φ5mm connected with a wire, and then get calcium doped nitriding Silicon graphene paste electrode sensor. The electrode prepared by this application has the advantages of 4-6 times higher conductivity than ordinary carbon paste electrodes, wide electrochemical window, simple preparation method, easy surface renewal, and small residual current. High detection sensitivity and good selectivity.

The invention discloses a coaxial composite oxygen microelectrode and a preparation method thereof. The oxygen microelectrode comprises an outer casing, a working cathode column at its center and a reference electrode between the two. An electrolyte solution is injected between them; the outer wall of the working cathode column or the inner wall of the outer casing is plated with a silver layer, and a conductive wire is welded on the upper surface of the silver layer to form a protective cathode. The electrode manufacturing process is simple, and the drawing efficiency is high. The results show that: the connection of the protective cathode reduces the residual current of the coaxial composite oxygen microelectrode by about 80%, and the linear correlation R2 of the response to dissolved oxygen is above 0.99. The resolution of dissolved oxygen is about 0.03mg O2 / L.