Microring electrode and production method thereof

A micro-electrode and micro-electrode array technology, which is applied in the fields of material electrochemical variables, liquid chemical plating, metal material coating process, etc., can solve the problems of difficult preparation, limited research and application, few preparation reports, etc. Low cost, controllable electrode size effect

Inactive Publication Date: 2015-08-12
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Noble metal ultra-micro electrodes can be used in research in many fields such as chemical analysis, environmental science, and biomedicine. However, due to its difficulty in preparation, especially the preparation of electrodes with a tip of only a few microns or submicrons, there are not many reports on the preparation of electrodes, making their research and application difficult. severely restricted
[0003] At present, the preparation of small-sized noble metal microelectrodes is mainly to fix different electrode materials such as gold, platinum, silver, nickel, tungsten and other materials inside the insulating support to form microelectrodes, and th

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  • Microring electrode and production method thereof
  • Microring electrode and production method thereof
  • Microring electrode and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1, preparation gold film microelectrode

[0035] 1) Preparation of nano gold sol:

[0036] After heating 100mL of the aqueous solution of 0.1% mass percent concentration of chloroauric acid to boiling, add 2.5mL of the mass percent concentration of 1% sodium citrate aqueous solution, and reflux for 10min. Remove the heat source, and wait for the solution to cool to room temperature to obtain nano-gold sol, which should be stored at low temperature and protected from light.

[0037] 2) Preparation of support body:

[0038] A quartz capillary was drawn into a micron-sized tip on a P-97 puller, and the diameter of the micron-sized tip was 5-50 μm, which was used as a support for preparing a gold film electrode in the next step.

[0039] 3) Wet deposition of gold on the inner wall of the capillary:

[0040]Push 2.0mL of acetone and 1.5mL of deionized water into the support drawn in 2) in turn under the push of a micro-syringe pump for cleaning, and the cleanin...

Embodiment 2

[0049] Embodiment 2, preparation gold film microelectrode

[0050] 1) Preparation of nano-gold sol: according to embodiment 1 step 1), only the aqueous solution of chloroauric acid with a mass percentage concentration of 0.1% is replaced with the aqueous solution of 0.05% chloroauric acid;

[0051] 2) Preparation of support body: same as step 2) of Example 1;

[0052] 3) Wet deposition of gold on the inner wall of the capillary:

[0053] Push 2.0mL of acetone and 2mL of deionized water into the support drawn in 2) in turn under the push of a micro-syringe pump for cleaning, and the cleaning flow rate is 10 μL / min;

[0054] Then the H with a volume ratio of 7:3 2 SO 4 / H 2 o 2 After the piranha solution formed was surface hydroxylated on the inner wall of the capillary for 10 minutes;

[0055] Under the push of a micro-injection pump, oxidize 3.0 mL of a dopamine aqueous solution with a mass concentration of 4 mg / mL in air for 15 min, push it into a capillary support whos...

Embodiment 3

[0060] Embodiment 3, preparation gold film microelectrode

[0061] 1) Preparation of nano-gold sol: according to embodiment 1 step 1), only the aqueous solution of the chloroauric acid of 0.1% is replaced by the aqueous solution of 0.2% by mass percent concentration, and 2.5mL mass percent concentration is 1% aqueous solution of sodium citrate was replaced by 2.0mL of 0.6% aqueous solution of sodium citrate;

[0062] 2) Preparation of support body: same as step 2) of Example 1;

[0063] 3) Wet deposition of gold on the inner wall of the capillary:

[0064] Push 2.0mL of acetone and 3.0mL of deionized water into the support drawn in 2) in turn under the push of a micro-syringe pump for cleaning, and the cleaning flow rate is 25 μL / min;

[0065] Then the H with a volume ratio of 7:3 2 SO 4 / H 2 o 2 After the piranha solution formed was surface hydroxylated on the inner wall of the capillary for 30 minutes;

[0066] Under the push of a micro-injection pump, 2.0 mL of dopam...

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Abstract

The invention discloses a gold film material-based microring electrode and a production method thereof. The method comprises the following steps: self-assembling a polydopamine layer on the inner wall of a hydroxylated capillary tube, self-assembling a single layer of gold or platinum nanoparticles through using electrostatic effect, Van der Waals force and hydrogen bond between amino and hydroxy groups and nanogold, and introducing a chemical plating solution containing auric chloride acid and hydroxylamine hydrochloride into the tube to grow the gold or platinum film. The method for producing the gold film or platinum film microelectrode is simple, is easy to operate, and allows the uniform thickness-controllable gold film or platinum film to be formed on the inner wall of a glass or quartz tube. The single microelectrode produced through the method can be potentially applied to release analysis of in vivo in-situ or cell surface chemical substances.

Description

technical field [0001] The invention belongs to the field of microelectrode preparation, and relates to a microring electrode and a preparation method thereof. Background technique [0002] Ultramicroelectrode, also known as microelectrode, refers to a type of electrode whose one-dimensional size is micron or nanoscale (usually at least one dimension is less than 25 microns), which was introduced into the field of electroanalytical chemistry by Wightman and Fleischmann et al.[ Wightman R M, Microvoltammetric Electrodes [J]. Anal. Chem. 1981, 53 (9): 1125A-1134A; Fleischmann M, Pons S. The Behavior of Microelectrodes [J]. Anal. Chem., 1987, 59 (24): 1391A-1399A]. Microelectrode has characteristics that cannot be compared with conventional electrodes, such as small charging current, fast mass rate, high electron transport rate, small RC constant, small ohmic drop, and high signal-to-noise ratio, so it can meet the requirements of electrochemical analysis in special occasiona...

Claims

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Application Information

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IPC IPC(8): C23C18/42C23C18/18G01N27/30
Inventor 林雨青王克青徐亚男王艺涵徐伶俐
Owner CAPITAL NORMAL UNIVERSITY
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