Hemispherical-shell-shaped porous gold micro-nano structure and preparation method and functions thereof

A technology of micro-nano structure and hemispherical shell, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of reducing SERS activity, difficulty in obtaining SERS, and complexity, etc., and achieve high SERS activity, High SERS activity, damage reduction effect

Inactive Publication Date: 2017-09-12
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product has strong light absorption at 785nm, it is suitable for the detection of pesticide molecules, but it has shortcomings with its preparation method. At first, the shell and ring body in the product are dense, greatly reduce its SERS activity; secondly, the preparation method is not only difficult to obtain products with higher SERS activity, but also complicated

Method used

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  • Hemispherical-shell-shaped porous gold micro-nano structure and preparation method and functions thereof
  • Hemispherical-shell-shaped porous gold micro-nano structure and preparation method and functions thereof

Examples

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Effect test

Embodiment 1

[0035] The specific steps of preparation are:

[0036] Put the graphite sheet as the anode and the conductive substrate as the cathode in the silver electrolyte at 100μA / cm 2 Electrodeposition at a constant current of 200 min; wherein the conductive substrate is an indium tin oxide glass substrate, and the silver electrolyte is a mixture of 0.2g / L silver nitrate aqueous solution and 50g / L citric acid aqueous solution, and the adhesion Conductive substrate of micron hemisphere assembled by silver nanoparticles. Then, the conductive substrate with micron hemispheres assembled with silver nanoparticles attached to it was cleaned once with deionized water, then placed in the gold electrolyte for 60 minutes, and after taking it out, it was cleaned with deionized water once , Dried at 40℃; among them, the gold electrolyte is a mixture of 0.3g / L chloroauric acid aqueous solution and 50g / L sodium chloride aqueous solution, which is approximately figure 1 Hemispherical shell-like porous g...

Embodiment 2

[0038] The specific steps of preparation are:

[0039] Put the graphite sheet as the anode and the conductive substrate as the cathode in the silver electrolyte at 325μA / cm 2 Electrodeposition at a constant current of 158min; among them, the conductive substrate is an indium tin oxide glass substrate, the silver electrolyte is a mixture of 1g / L silver nitrate aqueous solution and 40g / L citric acid aqueous solution, and the silver is attached to it. Conductive substrate of micron hemisphere assembled by nanoparticles. Then the conductive substrate with micron hemispheres assembled with silver nanoparticles was cleaned twice with deionized water, then placed in the gold electrolyte for 95 minutes, and after taking it out, it was cleaned with deionized water twice , Dried at 45°C; among them, the gold electrolyte is a mixture of 1g / L chloroauric acid aqueous solution and 40g / L sodium chloride aqueous solution, which is approximately figure 1 Hemispherical shell-like porous gold micr...

Embodiment 3

[0041] The specific steps of preparation are:

[0042] Put the graphite sheet as the anode and the conductive substrate as the cathode in the silver electrolyte at 550μA / cm 2 Electrodeposition at a constant current of 115min; wherein, the conductive substrate is an indium tin oxide glass substrate, and the silver electrolyte is a mixture of 5g / L silver nitrate aqueous solution and 25g / L citric acid aqueous solution, and the silver is attached to it. Conductive substrate of micron hemisphere assembled by nanoparticles. Then the conductive substrate with micron hemispheres assembled with silver nanoparticles was cleaned twice with deionized water, and then placed in the gold electrolyte for 130 minutes. After taking it out, it was cleaned with deionized water twice , Dried at 50°C; among them, the gold electrolyte is a mixture of 3g / L chloroauric acid aqueous solution and 25g / L sodium chloride aqueous solution to prepare such figure 1 Hemispherical shell-like porous gold micro-nano...

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Abstract

The invention discloses a hemispherical-shell-shaped porous gold micro-nano structure and a preparation method and functions thereof. According to the gold micro-nano structure, a conducting substrate is provided with a gold micron hemisphere with the hemisphere diameter being 4-10 microns and the spherical shell thickness being 200-1000 nm, and a gold micron hemisphere shell is composed of a plurality of holes with the diameter being 50-200 nm. The method comprises the steps that firstly, a graphite flake is served as the anode, the conducting substrate is served as the cathode, the graphite flake and the conducting substrate are placed in a silver electrolyte and are subjected to electro-deposition under a constant electric current, and the conducting substrate to which the micron hemisphere assembled by silver nano particles is attached is obtained; then, the conducting substrate to which the micron hemisphere assembled by the silver nano particles is attached is placed into a gold electrolyte and stands still, and a target product is prepared. The hemispherical-shell-shaped porous gold micro-nano structure has high SERS activity and is extremely easily applied to rapid trace detection of farm chemical thiram widely and commercially.

Description

Technical field [0001] The invention relates to a gold micro-nano structure and a preparation method and application, in particular to a hemispherical shell-shaped porous gold micro-nano structure and a preparation method and application thereof. Background technique [0002] Due to the resonance properties of surface plasmons, noble metal nanostructures or micro-nano structures have a wide range of applications in surface enhanced spectroscopy, especially SERS spectroscopy. Recently, people have made some useful attempts and efforts to obtain precious metal micro-nano structures with surface plasmon resonance properties, such as the title "Gold Binary-Structured Arrays Based on Monolayer Colloidal Crystals and Their Optical Properties", Small, 2014, 10, 2374-2381 ("Single-layer colloidal crystal-based gold dual structure array and its optical properties", "Small" 2014, Issue 10, pages 2374-2381) article. The gold double structure array mentioned in this article is a loose and o...

Claims

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Application Information

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IPC IPC(8): C25D5/54C25D3/46C25D3/48G01N21/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25D3/46C25D3/48C25D5/54G01N21/658
Inventor 朱储红孟国文
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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