Preparation method and application of dual function expanded graphite/nanogold composite electrode

A composite electrode, nano-gold technology, applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problems of poor sensor stability, cumbersome, expensive carbon materials, etc., achieve low detection limit, avoid cumbersome Process, low cost effect

Active Publication Date: 2019-05-17
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of these carbon materials is expensive and tedious, and the off-line synthesis and later remodification process lead to poor sensor stability.

Method used

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  • Preparation method and application of dual function expanded graphite/nanogold composite electrode
  • Preparation method and application of dual function expanded graphite/nanogold composite electrode
  • Preparation method and application of dual function expanded graphite/nanogold composite electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Insulate the Mitsubishi 2B pencil lead (diameter 0.5 mm) with AB glue, keep the length of the conductive part at 0.5 cm, rinse with secondary water, and dry at room temperature;

[0031] (2) Using the traditional three-electrode system, at 0.1M Na 2 SO 4 In the electrolyte solution, the pencil lead electrode is the working electrode, the platinum wire electrode is the counter electrode, and the saturated calomel electrode is the reference electrode;

[0032] (3) Using the constant potential method, a constant potential of 2 V was used for 300 s to obtain a pencil lead graphite electrode with a fluffy surface, which was taken out, rinsed with secondary water, and dried at room temperature.

[0033] The prepared fluffy pencil lead graphite was observed under a scanning electron microscope (SEM), and it was found that the surface of the fluffy pencil lead graphite became rougher, forming a 3D graphene-like surface. showed that the specific surface area of ​​the fluff...

Embodiment 2

[0035] (1) Insulate the Mitsubishi 2B pencil lead (diameter 0.5 mm) with AB glue, keep the length of the conductive part at 0.5 cm, rinse with secondary water, and dry at room temperature;

[0036] (2) Using the traditional three-electrode system, at 0.1M Na 2 SO 4 In the electrolyte solution, the pencil lead electrode is the working electrode, the platinum wire electrode is the counter electrode, and the saturated calomel electrode is the reference electrode;

[0037] (3) Using the constant potential method, a constant potential of 2 V was used for 300s to obtain a pencil-lead graphite electrode with a fluffy surface, which was taken out, rinsed with secondary water, and dried at room temperature;

[0038] (4) Add 1g HAuCl 4 • 4H 2 O dissolved in 100mLH 2 O, obtain the chloroauric acid mother liquor of certain concentration;

[0039] (5) Take 1.65mL from the chloroauric acid mother liquor and disperse it in 10mL PBS solution with a pH value of 7.4 to obtain HAuCl with a ...

Embodiment 3

[0044] (1) Insulate the Mitsubishi 2B pencil lead (diameter 0.5 mm) with AB glue, keep the length of the conductive part at 0.5 cm, rinse with secondary water, and dry at room temperature;

[0045] (2) Using the traditional three-electrode system, at 0.1M Na 2 SO 4 In the electrolyte solution, the pencil lead electrode is the working electrode, the platinum wire electrode is the counter electrode, and the saturated calomel electrode is the reference electrode;

[0046] (3) Using the constant potential method, a constant potential of 2 V was used for 300s to obtain a pencil-lead graphite electrode with a fluffy surface, which was taken out, rinsed with secondary water, and dried at room temperature;

[0047] (4) Add 1g HAuCl 4 • 4H 2 O dispersed in 100mLH 2 O, obtain the chloroauric acid mother liquor of certain concentration;

[0048] (5) Take 1.65mL from the chloroauric acid mother liquor and disperse it in 10mL PBS solution with a pH value of 7.4 to obtain HAuCl with a ...

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Abstract

The invention belongs to the technical field of nanogold sensors, in particular to a preparation method and application of a dual function expanded lead refill graphite/nanogold composite electrode. Amild voltage is applied to graphite, so that the edge of the graphite is expanded without stripping to obtain a netlike puffy graphite structure; and then metal nanoparticles are electrically deposited in situ to obtain a composite electrode. A puffed graphene like structure can provide a large specific surface area and a large quantity of binding sites; and the high electrocatalytic capability and plasma characteristic of the gold nanoparticles show excellent performance on the aspects of glucose catalyzation and SERS (Surface Enhanced Raman Scattering) application. The prepared composite electrode solves the problems of poor response stability, low sensitivity and poor reproducibility caused by offline synthesis and later material fixing. The composite electrode has a relatively wide linear range, relatively low detection limit and high reproducibility specific to glucose catalyzation, and has very high SERS response, high sensitivity and high stability specific to probe molecules.

Description

technical field [0001] The invention belongs to the technical field of nano-gold sensors, and in particular relates to a preparation method and application of a bifunctional expanded graphite / nano-gold composite electrode. Background technique [0002] Gold nanoparticles (AuNPs) are the most stable nano-metallic particles, due to their unique optical, electronic and photothermal conversion properties, AuNPs of a certain shape and size are ideal for sensors, surface-enhanced Raman scattering (SERS), imaging diagnostics and light Research hotspots in the field of hot cancer therapy. [0003] Common methods for synthesizing AuNPs include chemical reduction, Brust-Schiffrin, physical and electrodeposition methods. The electrodeposition technology is fast and easy to operate, and the controllable synthesis of AuNPs with different shapes and sizes can be realized by adjusting the electrodeposition conditions. [0004] AuNPs usually need to be combined with other nanomaterials as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N27/327B82Y15/00B82Y30/00
Inventor 翁雪香向雪晴王秋秋阮永明
Owner ZHEJIANG NORMAL UNIVERSITY
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