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Method for preparing solid phase micro-extraction fiber by self-assembling graphene coating on metal wire layer by layer

A technology of layer-by-layer self-assembly and fiber extraction, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of short service life, easy falling off of graphene, etc., to improve mechanical strength, improve brittleness, and improve stability. Effect

Inactive Publication Date: 2014-07-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene has also been applied to the preparation of solid-phase microextraction fiber coatings, showing good extraction performance, but the existing preparation methods are limited to physical coating and sol-gel methods, because there is no solid-phase microextraction between the graphene coating and the carrier. Chemical bonding causes graphene to fall off easily and has a short service life

Method used

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  • Method for preparing solid phase micro-extraction fiber by self-assembling graphene coating on metal wire layer by layer
  • Method for preparing solid phase micro-extraction fiber by self-assembling graphene coating on metal wire layer by layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Preparation of layer-by-layer self-assembled graphene-coated stainless steel wire solid-phase microextraction fiber

[0024] Include the following steps A and B in turn:

[0025] A. Electroless silver plating on the surface of stainless steel wire

[0026] After the surface of the stainless steel wire is polished with fine sandpaper, it is washed with water and ethanol in sequence to remove impurities on the surface and increase the surface area. Put the treated stainless steel wire into the mixed solution of silver ammonia solution and glucose solution, the molar ratio of silver ammonia ion and glucose is 1:0.5, the mass concentration of glucose is 30%, react at room temperature for 2 hours.

[0027] B. Preparation of layer-by-layer self-assembled graphene coatings

[0028] Graphene oxide with a mass ratio of 1:1 reacted with mercaptopropyltrimethoxysilane at 120° C. under nitrogen protection for 6 hours, and obtained mercapto-functionalized graphene (such...

Embodiment 2

[0029] Example 2: Preparation of layer-by-layer self-assembled graphene-coated titanium wire solid-phase microextraction fiber

[0030] Include the following steps A and B in turn:

[0031] A. Electroless silver plating on the surface of titanium wire

[0032] After the surface of the titanium wire is polished with fine sandpaper, it is washed with water and ethanol in sequence to remove impurities on the surface and increase the surface area. Put the treated titanium wire into the mixed solution of silver ammonia solution and glucose solution, the molar ratio of silver ammonia ion and glucose is 1:3, the mass concentration of glucose is 5%, and react at room temperature for 1 hour.

[0033] B. Preparation of layer-by-layer self-assembled graphene coatings

[0034] Graphene oxide with a mass ratio of 1:10 was reacted with mercaptopropyltrimethoxysilane at 80°C under nitrogen protection for 72 hours, and mercapto-functionalized graphene was obtained after washing. Soak the s...

Embodiment 3

[0035] Example 3: Preparation of layer-by-layer self-assembled graphene-coated nickel wire solid-phase microextraction fiber

[0036] Include the following steps A and B in turn:

[0037] A. Electroless silver plating on the surface of nickel wire

[0038] After the surface of the nickel wire is polished with fine sandpaper, it is washed with water and ethanol in sequence to remove impurities on the surface and increase the surface area. Put the treated nickel wire into the mixed solution of silver ammonia solution and glucose solution, the molar ratio of silver ammonia ion and glucose is 1:2, the mass concentration of glucose is 15%, and react at room temperature for 0.5 hours.

[0039] B. Preparation of layer-by-layer self-assembled graphene coatings

[0040] Graphene oxide with a mass ratio of 1:5 was reacted with mercaptopropyltriethoxysilane at 90°C under argon protection for 48 hours, and mercapto-functionalized graphene was obtained after washing. Soak the silver-pla...

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Abstract

The invention discloses a method for preparing a solid phase micro-extraction fiber by self-assembling a graphene coating on a metal wire serving as a carrier layer by layer, and particularly relates to a method for self-assembling graphene on the surface of a metal wire layer by layer by taking gold nano particles as connection arms. The novel method is characterized by comprising the following steps of: performing chemical silver plating on the surface of the metal wire by taking the metal wire as the carrier; and self-assembling sulfydryl functional graphene on the silver-plated metal wire layer by layer by adopting a layer-by-layer self-assembly method and taking the gold nano particles as the connection arms, and thus obtaining the novel solid phase micro-extraction fiber by self-assembling the graphene coating layer by layer. The prepared solid phase micro-extraction fiber has the characteristics of high mechanical strength, stable extraction coating, high enrichment capacity, long service life and the like, can be used for enrichment analysis of trace components in samples, such as foods, environments, medicaments, biochemical substances and the like, and has high application potential.

Description

technical field [0001] The invention relates to a technique for preparing solid-phase microextraction fiber of graphene bonding coating on a metal wire carrier. Background technique [0002] Solid-phase microextraction (SPME) is a new type of high-efficiency separation technology developed in the 1990s. It has low cost, strong enrichment ability, fast analysis speed, easy operation, and convenient on-site analysis and instrument connection. It has been widely used in the enrichment analysis of trace components in food, environmental, pharmaceutical and biochemical samples. The core of this technology is the preparation of solid-phase microextraction fibers. The solid-phase microextraction fibers with excellent extraction performance and long life depend on the carrier and the extraction coating. Fused silica is a common carrier for preparing solid-phase microextraction fibers. Due to its poor mechanical properties, it is easily broken during operation, which seriously affec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/32B01J20/20
Inventor 孙敏罗川南邱化敏范露露
Owner UNIV OF JINAN
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