Method for preparing nano-stick array electrode capable of self-assembling after dispersing

A nanorod array and self-assembly technology, applied in electrodes, active material electrodes, electrolysis processes, etc., can solve the problems of low signal-to-noise ratio and underutilized electrode surface area of ​​gold nanowire electrodes, and achieve large electrode surface area, rapid The effect of diffusive mass transfer capability, good biocompatibility

Inactive Publication Date: 2008-04-23
HARBIN INST OF TECH
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Problems solved by technology

However, the electrode spacing of the array electrode is directly determined by the micropore spacing of the AAO template, which is only slightly larger than the pore diameter. Therefore, the diffusion layers between multiple gold nanowire electrodes are seriously overlapped, and the overall electrode diffusion layer is the same as that with the same The apparent area of ​​the flat macro electrode is equivalent, so the Faraday current is only equivalent to the flat macro electrode of the same apparent area, and the abundant electrode surface area of ​​the gold nanowire electrode has not been fully utilized.
Not only that, the charging current of the electric double layer is proportional to the real surface area of ​​the electrode, so the charging current of the electric double layer as the background current is very large, so the signal-to-noise ratio is very low

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  • Method for preparing nano-stick array electrode capable of self-assembling after dispersing
  • Method for preparing nano-stick array electrode capable of self-assembling after dispersing

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specific Embodiment approach 1

[0010] Specific Embodiment 1: This embodiment is realized by the following steps: 1. Dissolving the template of the metal nanorods grown by the template method, so that the nanorods can be manipulated freely; Fully disperse, avoid agglomeration, and form a dispersion solution of single nanorods; 3. By adjusting the concentration of nanorods in the dispersion liquid, self-assemble the nanorods on the surface of the substrate electrode with a controllable spacing.

[0011] The base electrode may be one of carbon, gold, platinum, silver or indium tin oxide (ITO) electrodes.

[0012] The molecular self-assembly method refers to the single-layer or multi-layer connection of the base electrode and the metal nanorod through the molecular self-assembly with characteristics such as electrostatic attraction and covalent adsorption.

[0013] The metal nanorods are prepared by the template method, with a diameter of 2 to 250 nm (10 to 100 nm at best), and an aspect ratio of 1:1 to 100:1 (...

specific Embodiment approach 2

[0018] Specific embodiment two: a specific embodiment is provided below. In this embodiment, AAO templates and gold nanorods are selected; in step 1, the preparation of AAO templates and the growth of gold nanorods are realized in this way: first, the -1 h 2 SO 4 In the solution, keep the temperature at 0-4°C, and use an anodizing voltage of 19V to anodize the aluminum foil for 3 hours once and 2 hours for the second anodization to obtain an AAO template; before the end of the second anodization, use a step-down method , to thin the barrier layer; then use 50Hz alternating current, the voltage is 6.5V, with the aluminum foil with AAO template as the working electrode, in HAuCl 4 4H 2 O+H 3 BO 3 In the solution of AC electrodeposition for 3min, the gold nanorods deposited in the AAO template were obtained; where HAuCl 4 4H 2 The concentration of O is 1g L -1 , H 3 BO 3 The concentration is 30g·L -1 , the pH of the solution=1.5;

[0019] Dissolving the template in st...

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Abstract

The present invention relates to nanometer rod array electrode, and is especially nanometer metal rod dispersing and self-assembling process of preparing nanometer rod array electrode with best utilization of surface area. The process includes the following steps: dissolving the template for growing nanometer metal rods, adding dispersant to the solvent and ultrasonically treating for well dispersing nanometer metal rods in the solvent, and regulating the concentration of nanometer metal rods to self-assemble nanometer metal rods onto the surface of electrode base in controllable intervals. The nanometer metal rod array electrode has best utilization of the great surface area of the nanometer metal rods, very high diffusion flux and faraday current, and very high electrically catalytic activity.

Description

technical field [0001] The invention relates to a preparation method of a nano-rod array electrode, in particular to a preparation method of a self-assembled nano-rod array electrode after dispersion of metal nano-rods grown by a template method. Background technique [0002] Ultramicroarray electrodes have received high attention because they maintain the characteristics of high diffusion flux and high response speed of a single ultramicroelectrode, and can obtain a large current intensity. [0003] In recent years, metal nanomaterials, especially metal nanoparticles, have been widely used in the modification of electrochemical electrodes to form nanoparticle array electrodes. These metal nanoparticles not only play the role of increasing the surface area of ​​the electrode, increasing the conductivity, and improving the diffusion and mass transfer ability through the non-linear diffusion of ultra-micro electrodes on the electrode, but also can improve the catalytic activit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/00H01M4/02G01N27/30
CPCY02E60/12
Inventor 贾铮刘静沈炎宾
Owner HARBIN INST OF TECH
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