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Modified electrode and preparation method thereof

A technology for modifying electrodes and platinum electrodes, applied in the field of electrochemiluminescence, which can solve the problems of long reaction time, unstable ruthenium terpyridine, and poor control.

Inactive Publication Date: 2013-09-04
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some defects in these methods, for example, the ruthenium terpyridyl fixed to the surface of the electrode is not easy to contact with the reactant to react, and the reaction time is relatively long due to the slow diffusion on the electrode surface
In addition, the ruthenium terpyridyl fixed by self-assembly is unstable during the scanning process, and some methods for fixing ruthenium terpyridine are very complicated and difficult to control

Method used

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  • Modified electrode and preparation method thereof

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Embodiment 1

[0044] The preparation method of the modified electrode of the present invention is as follows:

[0045] a) Polish the platinum electrode into a mirror surface with 0.3 μm and 0.05 μm aluminum oxide suspension in turn, and then ultrasonically clean it with 95% ethanol and double distilled water in turn to obtain the pretreated Platinum electrode;

[0046] b) Rinse the pretreated platinum electrode with double distilled water, dry it with nitrogen gas with a purity of 99.999%, and place it in HAuCl with a molar concentration of 17mmol / L 4 and 2mol / LNH 4Cl solution, and the three-electrode system with the pretreated platinum electrode as the working electrode, the platinum wire as the counter electrode, and the Ag / AgCl electrode as the reference electrode was used in a multi-channel electrochemical workstation with a voltage of -0.2V Scan at a constant potential for 10s to prepare a gold nanoparticle-modified platinum electrode covered with a gold nanoparticle film;

[0047] ...

Embodiment 2

[0062] The difference between this embodiment and Example 1 is: phosphate buffer saline (phosphate buffer saline is Na 2 HPO4 and KH 2 Mixed solution of PO4, Na 2 HPO4:KH 2 The volume ratio of PO4 is 5:95, the concentration is 67mmol / L), the pH value is 5.0, electropolymerization Ru (bpy) 3 2+ The number of laps of electropolymerization is 23 laps.

Embodiment 3

[0064] The difference between this embodiment and Example 1 is: phosphate buffer saline (phosphate buffer saline is Na 2 HPO4 and KH 2 Mixed solution of PO4, Na 2 HPO4:KH 2 The volume ratio of PO4 is 10:90, the concentration is 67mmol / L), the pH value is 6.0, electropolymerization Ru (bpy) 3 2+ The number of turns of electropolymerization is 10 turns.

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Abstract

The invention provides a modified electrode, which comprises a substrate electrode, a gold nanoparticles film coated on the surface of the substrate electrode, Ru (bpy) 32+ coated on the surface of the gold nanoparticles, and Nafion coated on the surface of the Ru (bpy) 32+. The invention further provides a preparation method of the modified electrode, which comprises the following steps: firstly, preprocessing the substrate electrode; secondly, coating the gold nanoparticles on the surface of the processed substrate electrode obtained in the first step; thirdly, coating Ru (bpy) 32+ on the surface of the electrode obtained in the second step; and fourthly, coating Nafion on the surface of the electrode obtained in the third step, so as to obtain the modified electrode disclosed by the invention. The modified electrode of the invention can be served as a luminous material for detecting other materials. The method provided by the invention is simple, rapid, convenient, and easy to control, and can further generate a cathode ECL (Electro Chemi Luminescence) effect during a fixing process.

Description

technical field [0001] The invention relates to the field of electrochemiluminescence, in particular to a modified electrode and a preparation method thereof. Background technique [0002] Electrochemiluminescence (Electrochemiluminescence or ECL) refers to the phenomenon that photoactive molecules undergo electrochemical reactions on the electrode surface to form an excited state, and then return to the ground state to emit light. The detection and analysis method based on ECL has the advantages of high sensitivity, reproducibility and easy automation, and has been widely used in biological, pharmaceutical and environmental analysis. Among a large number of ECL reagents, ruthenium terpyridyl (Ru(bpy) 3 2+ ) has been intensively studied and widely used due to its good chemical stability and excellent electrochemical performance. However, most applications are carried out in solution. If the luminescent substance is fixed on the electrode surface, expensive reagents can be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
Inventor 卢小泉刘冬李亚亚王海峰姬东琴
Owner NORTHWEST NORMAL UNIVERSITY