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Method for fixing terpyridyl ruthenium on surface of electrochemical electrode

A technology of ruthenium terpyridine and electrode surface, which is applied in the fields of electrochemical variables of materials, chemiluminescence/bioluminescence, and analysis by making materials undergo chemical reactions, etc. It can solve the problems of poor stability, cumbersome operation, and poor conductivity of electrodes, etc. problems, to achieve the effect of broad application prospects, low cost, and simple operation

Active Publication Date: 2012-06-27
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have obvious deficiencies. For example, the conductivity of electrodes prepared by using ion-exchange membranes is poor. Later, Dong’s group added carbon nanotubes with good conductivity, but the effect is still not ideal. In addition, the electrodes prepared by this method Chemical sensors have low luminescence performance and poor stability
When fixing by self-assembly method, it is required to bring different electrical properties on the surface of the film and ruthenium pyridine, which is cumbersome to operate and has poor stability.
SiO 2 Although it can fix ruthenium terpyridine more stably, its non-conductivity seriously affects the luminescence performance of the sensor.

Method used

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  • Method for fixing terpyridyl ruthenium on surface of electrochemical electrode
  • Method for fixing terpyridyl ruthenium on surface of electrochemical electrode
  • Method for fixing terpyridyl ruthenium on surface of electrochemical electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Electrochemical workstation and chemiluminescence analysis test system were used. 10 microliters of 2 g / L ruthenium terpyridine solution was dropped on the surface of the cleaned glassy carbon electrode; after natural drying, 10 microliters of 0.25 g / L graphene oxide solution was dropped on the surface of the electrode; after natural drying, 10 Microliter hydrazine solution (volume ratio water:hydrazine:ammonia=100:0.8:2) was dropped on the surface of the electrode as a reducing agent, and dried naturally at 25°C for 24 hours. Finally, the electrode was carefully washed with water to obtain a ruthenium-graphene film-modified ECL sensor. The sensor was scanned by cyclic voltammetry in a phosphate buffer solution containing tripropylamine (TPrA), and the electrochemiluminescence signal was used to quantitatively detect tripropylamine (TPrA), with a linear range of 5×10 -7 -2×10 -4 mol / L, the detection limit is 3×10 -8 mol / liter. By testing the ECL response of the sens...

Embodiment 2

[0017] Electrochemical workstation and chemiluminescence analysis test system were used. 10 microliters of 2 grams per liter of ruthenium terpyridine solution was dropped on the surface of the cleaned glassy carbon electrode; after natural drying, 10 microliters of 0.25 grams per liter of graphene oxide solution was dropped on the surface of the electrode; after natural drying again, 10 microliters of bovine serum albumin solution (50 g / L, pH=10) was dropped on the surface of the electrode as a reducing agent, and dried slowly at 30°C for 24 hours in a water bath. Finally, the electrode was carefully washed with water to obtain a ruthenium-graphene film-modified ECL sensor. The sensor was scanned by cyclic voltammetry in a phosphate buffer solution containing tripropylamine (TPrA), and the electrochemiluminescent signal was used to quantitatively detect tripropylamine (TPrA), with a linear range of 1×10 -6 -2×10 -4 mol / L, the detection limit is 5×10 -7 mol / liter. By testin...

Embodiment 3

[0019] Electrochemical workstation and chemiluminescence analysis test system were used. 10 microliters of 2 g / L ruthenium terpyridine solution was dropped on the surface of the cleaned ITO electrode; after natural drying, 10 microliters of 0.25 g / L graphene oxide solution was dropped on the surface of the electrode; after natural drying again, 10 µl hydrogen bromide solution (5 x 10 -3 mol / L) as a reducing agent, was dropped on the surface of the electrode and dried naturally at 25°C for 24 hours. Finally, the electrode was carefully washed with water to obtain a ruthenium-graphene film-modified ECL sensor. The sensor was scanned by cyclic voltammetry in a phosphate buffer solution containing oxalic acid, and the electrochemiluminescent signal was used to quantitatively detect oxalic acid with a linear range of 1×10 -6 -2×10 -4 mol / L, the detection limit is 1×10 -7 mol / liter. By testing the ECL response of the sensor to oxalic acid every 5 days, it was found that 90% of ...

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Abstract

The invention particularly relates to a method for fixing terpyridyl ruthenium on the surface of an electrochemical electrode, which belongs to the field of materials and electrochemical luminescence detection. The method includes: reducing graphene oxide into a graphene film with excellent conductivity on the surface of the electrochemical electrode by means of chemical reduction reaction; firmly attaching the generated graphene film on the surface of the electrode; and stably fixing the terpyridyl ruthenium to the surface of the electrode by means of pi-pi interaction. Compared with other methods, the method has the advantage that an electrochemical luminescence sensor manufactured by the method has fine electrochemical luminescence performance and excellent stability, and is simple in operation and low in cost. In addition, the graphene film is used for fixing the terpyridyl ruthenium and also serves as a substrate for loading enzyme or nanoparticles on the electrochemical luminescence sensor, so that the electrochemical luminescence sensor manufactured by the method is wide in application prospect.

Description

technical field [0001] The invention relates to the field of electrochemiluminescence detection, in particular to a method for immobilizing ruthenium terpyridyl on the surface of an electrochemical electrode. Background technique [0002] Graphene is a two-dimensional crystal composed of carbon atoms. The arrangement of carbon atoms is the same as that of the single atomic layer of graphite. Graphene has been studied and applied in many fields because of its excellent mechanical properties, thermodynamic properties and electrical conductivity, including as an excellent electrode material. Graphene is considered to be a planar crystal of polycyclic aromatic hydrocarbon atoms, each carbon atom being sp 2 Hybridization, and contribute electrons on the remaining one p orbital to form a large π bond, which can adsorb some substances through π-π interaction. In addition, the huge specific surface area also makes it an excellent carrier for immobilizing various substances. [00...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N21/76
Inventor 高文华陈云生席静陈耀文林月娟鲁福身张晓珊
Owner SHANTOU UNIV
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