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Silk screen printing electrode, manufacturing technique and use thereof

A technology of screen printing electrode and preparation process, which is applied in the field of analytical instruments, can solve the problems of easy amalgamation of silver or gold electrodes and poor measurement reproducibility, and achieve the effects of simple production, low cost and high sensitivity

Inactive Publication Date: 2009-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a screen-printed electrode, a preparation process and its application, so as to overcome the disadvantage of poor measurement reproducibility caused by the easy amalgamation of the existing silver or gold electrodes

Method used

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  • Silk screen printing electrode, manufacturing technique and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A screen printing electrode, the screen used in the screen printing process has the following properties: the materials of the screen and the brush are polyester and plastic respectively, and the mesh number of the screen is 50 mesh; the distance between the screen and the base is d =3mm. Adopt 100 mesh titanium powder, the particle diameter of nano-titanium oxide is 20nm (mass ratio of titanium powder and nano-titanium oxide is 90:10). The angle adopted by the brush during printing is 45°. Such as figure 1 As shown, the screen printing electrode substrate material of this embodiment is polyetheretherketone (PEEK). Separately print titanium powder / nano-titanium oxide working electrode 2 on the substrate 6 on which the electrodes are printed, and an electrode specification layer 7 is also printed on the substrate; 2 electrodes are printed on the substrate 5, which are carbon auxiliary electrodes and Ag-AgCl reference electrode, each electrode is correspondingly connect...

Embodiment 2

[0023] Embodiment 2: A kind of screen printing electrode preparation process

[0024] First select the substrate 7 to be clean and dry and heat-resistant, the substrate is a polyetheretherketone substrate; then print the electrode leads 2; then dry the substrate 6, using titanium powder (100 mesh) / nano titanium oxide (particle size 20nm ) (mass ratio is 90:10) the titanium material film obtained by slurry printing is dried at room temperature for about 5 minutes, then placed in a muffle furnace for sintering at 220°C for 0.5h, and the heating rate is 15°C / min. Take it out at about 100°C. Finally, the insulating layer 7 is printed with light-curable insulating paste and cured with ultraviolet light.

[0025] The carbon electrode 1 is printed with carbon paste and the silver chloride reference electrode 2 is printed with Ag-AgCl paste and dried at 100-150 degrees for 8-15 minutes. Finally, the insulating layer 4 is printed with light-curable insulating paste and cured with ult...

Embodiment 3

[0030] Embodiment 3: the concentration of lead in the detection food sample of screen printing electrode in application embodiment 1

[0031] The method that the sensor of the present invention (i.e. the screen printing electrode described in Embodiment 1) is used to detect the heavy metal lead content adopts voltammetric analysis, at first, the described sensor is connected with an electrochemical analysis instrument; secondly, the The test sample is mixed with 5mL 0.1M HCl solution; finally, the lower end of the sensor electrode is immersed in the solution, and the voltammetry analysis method is started. Square wave amplitude 36mV, potential step value 3mV, frequency 15Hz, working potential window: -0.6V-+0.2V. The stripping peak current showed a good linear relationship with the lead concentration in the range of 0-67μg / L, the correlation was 0.997, and the detection limit was 3.76μg / L.

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Abstract

The invention discloses a screen painting electrode, which comprises a printing sizing agent that is used on a substrate and adopts a mixture of titanium powder and nano titanium oxide, a working electrode that is prepared through a screen painting technique, separately processed by chemical modification and provided with an electrode specification layer that is solidified by printing ultraviolet lights of photocureable insulating slurry, an auxiliary electrode that realizes the printing by adopting a carbon powder printing ink and a silver and silver chloride sizing agent on another substrate, and a silver chloride reference electrode; all electrode plates are assembled together by a silicon rubber. The invention further discloses a preparation method of the screen painting electrode and a plurality of application methods of the screen painting electrode. The invention can be widely applied in various electrochemical analysis fields, and is especially applicable to the heavy metal ion measurement with stripping voltammetry as well as the pesticide residue and veterinary drug residue measurement with adsorption wave voltammetry in food analysis and environment monitoring.

Description

technical field [0001] The invention belongs to the technical field of analytical instruments, and relates to a screen printing electrode, a preparation process and an application thereof. Background technique [0002] An electrochemical biosensor that converts chemical and biological non-electrical signals into electrical signals for detection. It has good selectivity, easy miniaturization, easy operation, low power consumption, low cost, and is not affected by optical path and sample turbidity compared with optical methods. In particular, it is compatible with the current MEMS technology, and has been applied to the analysis of food analysis such as pesticide residues, clinical biochemical index detection, industrial analysis and environmental monitoring and other fields. Screen printing electrode sensor technology not only provides the possibility of industrial production, but also helps to solve the problems of stability, reproducibility and cross-contamination of electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 司士辉陈昕梁逸曾曾小明梁丰
Owner CENT SOUTH UNIV
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