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Modification method of graphene/bismuth composite material and screen printing electrode

A technology of screen printing electrodes and composite materials, applied in the direction of electrochemical variables of materials, etc., can solve the problems of poor repeatability of electrochemical sensor measurement, and achieve the effects of large-scale production, convenient synthesis, and rapid response.

Inactive Publication Date: 2017-08-11
FUPAIT ENVIRONMENT TECH SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, during the use of the mercury film or the bismuth film, due to the continuous change of the electrode area, the measurement repeatability of the electrochemical sensor applied to it becomes poor.

Method used

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  • Modification method of graphene/bismuth composite material and screen printing electrode
  • Modification method of graphene/bismuth composite material and screen printing electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First, bismuth nitrate, graphene oxide and sodium borohydride were dissolved in water by ultrasonic wave at 300W to obtain a mixed solution with a concentration of 5mmol / L bismuth nitrate, 100mg / L graphene oxide and 5mmol / L sodium borohydride. Next, the above mixed liquid was transferred to a microwave flask, and a uniform mixed solution was formed by ultrasonic waves, and reacted under 500W microwave heating for 10 minutes to obtain a graphene / bismuth composite material. The above-mentioned graphene / bismuth composite material and 0.2mL 0.5% w / w Dupont D520Nafion solution were mixed evenly and coated on the working area of ​​the working electrode of the screen-printed electrode, and dried at 60°C to form a film to obtain a modified screen-printed electrode. The electrodes were activated by soaking with 20 wt% hydrazine hydrate for 8 min before use. In this example, a graphene / bismuth composite material containing bismuth nanospheres of 50-100 nm is attached to the upper...

Embodiment 2

[0029] First, bismuth nitrate, graphene oxide and sodium borohydride were dissolved in water by ultrasonic wave at 500W to obtain a mixed solution with a concentration of 1mmol / L bismuth nitrate, 100mg / L graphene oxide and 2mmol / L sodium borohydride. Next, the above mixed liquid was transferred to a microwave flask, and a uniform mixed solution was formed by ultrasonic waves, and reacted under 800W microwave heating for 10 minutes to obtain a graphene / bismuth composite material. The above-mentioned graphene / bismuth composite material and 0.2mL 0.5% w / w Dupont D520Nafion solution were mixed evenly and coated on the working area of ​​the working electrode of the screen-printed electrode, and dried at 60°C to form a film to obtain a modified screen-printed electrode. The electrodes were activated by soaking with 25 wt% hydrazine hydrate for 5 min before use. In this example, a graphene / bismuth composite material containing 20-50 nm bismuth nanospheres is attached to the upper sur...

Embodiment 3

[0031] First, bismuth nitrate, graphene oxide and sodium borohydride were dissolved in water by ultrasonic wave at 50W to obtain a mixed solution with a concentration of 1mmol / L bismuth nitrate, 100mg / L graphene oxide and 5mmol / L sodium borohydride. Next, the above mixed liquid was transferred to a microwave flask, and a uniform mixed solution was formed by ultrasonic waves, and reacted under 800W microwave heating for 5 minutes to obtain a graphene / bismuth composite material. The above-mentioned graphene / bismuth composite material and 0.2mL 0.5% w / w Dupont D520Nafion solution were mixed evenly and coated on the working area of ​​the working electrode of the screen-printed electrode, and dried at 60°C to form a film to obtain a modified screen-printed electrode. The electrodes were activated by soaking with 5 wt% hydrazine hydrate for 15 min before use. In this example, a graphene / bismuth composite material containing 10-30 nm bismuth nanospheres is attached to the upper surfa...

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Abstract

The invention discloses a multi-graphene / bismuth composite material and a method for modifying a screen printing electrode. In the preparation method of the graphene / bismuth composite material, first dissolve and mix to form a mixed solution comprising 1-25mmol / L water-soluble bismuth salt, 10-100mg / L graphene oxide and 1-25mmol / L reducing agent, and then heat to make The reaction, thus the prepared graphene / bismuth composite material. The graphene / bismuth composite material with a mass ratio of graphene / bismuth composite material of 20-200:1 is mixed with Nafion liquid, coated on the screen printing electrode, and then dried to obtain a modified silk with high detection repeatability of heavy metal ions Screen printed electrodes. In addition, the preparation method has cheap and easy-to-obtain raw materials, convenient synthesis, rapid reaction, no pollution in the production process, and rapid realization of large-scale production.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a graphene / bismuth composite material and a method for modifying screen-printed electrodes. Background technique [0002] Heavy metals cause long-term irreversible harm to organisms due to their accumulation in organisms, which has aroused widespread concern. The detection of trace heavy metals is very important in the fields of food, industry and environmental monitoring. Among many detection methods, electrochemical sensors have been widely used in food analysis, industrial analysis, and environmental detection due to their good selectivity, easy miniaturization, easy operation, low power consumption, and low cost. Compared with ordinary glassy carbon electrodes commonly used in electrochemical sensors, screen-printed electrodes have many advantages in application. Any modification, and save for a long time, etc. [0003] Bismuth is an electrode material that has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24G01N27/30
Inventor 汪孙力查娟夏思苑黎雨轩
Owner FUPAIT ENVIRONMENT TECH SUZHOU
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