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Microelectrode array sensor as well as preparation method and stripping voltmeter detection method thereof

A technology of microelectrode array and stripping voltammetry, which is applied in the field of sensors, can solve the problems of poor consistency of test results and achieve good consistency, good signal-to-noise ratio, and simple and portable instruments

Inactive Publication Date: 2012-08-15
GUANGZHOU INGSENS SENSOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the stirring of the solution, the properties of the electrode interface change, resulting in poor consistency of the test results

Method used

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  • Microelectrode array sensor as well as preparation method and stripping voltmeter detection method thereof
  • Microelectrode array sensor as well as preparation method and stripping voltmeter detection method thereof
  • Microelectrode array sensor as well as preparation method and stripping voltmeter detection method thereof

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Experimental program
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Effect test

Embodiment 1

[0055] Such as figure 1 , the microelectrode array sensor shown in Fig. 2 (a), Fig. 2 (b), comprise active point 1, conductive fiber 2 and insulator 3, active point is positioned at insulator top surface, conductive fiber passes through insulator and connects active point; Active point The diameter is 10 microns, and the conductive fiber includes a metal wire and an insulating material wrapped around the metal wire.

[0056] The insulator is cylindrical. There are 9 active points, one is located at the center of the top surface, and the rest are arranged around the center of the circle.

[0057] The material of the active point is: one or any combination of carbon fiber, glassy carbon, carbon nanotube, graphene, fullerene, diamond, gold, platinum, bismuth, boron.

[0058] The preparation method of the microelectrode array sensor is a photolithography method, and the photolithography method includes the following steps:

[0059] Such as image 3 As shown, the lithography st...

Embodiment 2

[0086] Such as Figure 5 as shown, Figure 5 It is the cyclic voltammogram of the microelectrode array sensor of the present invention in 0.01mol / L K3[Fe(CN)6]0.1mol / L KCl solution. The results of this implementation show that the microelectrode array has a spherical diffusion model response. It is very small, and the edge part is relatively close to the solution, and the replenishment of electroactive substances is relatively fast.

[0087] Figure 5 It reflects the basic electrochemical characteristics of the array microelectrode, and the current is very small in the cyclic voltammetry scan in the solution.

Embodiment 3

[0089] Image 6 is the microelectrode array of the present invention at 50ppb Pb 2+ Responses on different electrodes under different conditions, where:

[0090] a curve is the response of glassy carbon electrode (existing electrode) without stirring condition;

[0091] The b curve is the response of the glassy carbon electrode (existing electrode) under stirring conditions;

[0092] Curve c is the response of the carbon fiber array microelectrode (electrode of the present invention) without stirring.

[0093] The result of this implementation shows that the microelectrode array of the present invention does not need to be stirred, and has relatively high sensitivity.

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Abstract

The invention discloses a microelectrode array sensor which comprises an active point, a conductive fiber and an insulator, wherein the active point is located on the top surface of the insulator; the conductive fiber penetrates through the insulator to connect the active point; the diameter of the active point is between 0.1 and 25 microns; and the conductive fiber comprises a metal conductor and an insulating material wrapping outside the metal conductor. The invention also provides a preparation method of the microelectrode array sensor and the stripping voltmeter detection method of the microelectrode array sensor. According to the invention, rapid real-time detection of heavy metals is realized through the combination of a microelectrode array and an electrochemical stripping voltammetry; and the sensor is small in volume, low in cost, rapid and convenient for detection, high in sensitivity and has important significance on environment detection.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a microelectrode array sensor, a preparation method thereof, and a stripping voltammetry detection method. Background technique [0002] Heavy metal pollution is an important factor affecting the ecological environment, such as zinc Zn(II), cadmium Cd(II), lead Pb(II), copper Cu(II), mercury Hg(II), arsenic As(III), etc. With urbanization and large-scale industrialization, heavy metals are widely distributed in various water bodies and enter the human body through drinking water, food chains, and bioaccumulation to endanger human health. Therefore, it is urgent to develop rapid and effective detection of heavy metals. The traditional heavy metal detection method usually requires on-site sampling and then sent to the laboratory for analysis, which is costly and inefficient. Moreover, due to untimely detection, the sample may change or be contaminated midway, thus affecting the obj...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48B81C1/00
Inventor 叶建山黄奕莹
Owner GUANGZHOU INGSENS SENSOR TECH
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