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Cavity structure array assembled by silver nanoparticle, preparation method and use thereof

A technology of silver nanoparticles and cavities, which is applied in the field of cavity structure arrays assembled by silver nanoparticles and its preparation, can solve the problems of complex preparation steps, influence the uniformity and repeatability of SERS signals and the like, and achieve high SERS sensitivity, Guaranteed uniformity and batch repeatability, high SERS sensitivity results

Active Publication Date: 2022-07-01
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product has high SERS activity, it is easy to affect the uniformity and repeatability of SERS signals of different batches of samples due to the complicated preparation steps.

Method used

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  • Cavity structure array assembled by silver nanoparticle, preparation method and use thereof
  • Cavity structure array assembled by silver nanoparticle, preparation method and use thereof
  • Cavity structure array assembled by silver nanoparticle, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1, first weigh each group according to the weight ratio of silver nitrate powder, citric acid powder, EDTA powder, sodium sulfite powder and dipotassium hydrogen phosphate powder to water as 0.1:0.5:0.06:0.3:0.12:50 Dissolving silver nitrate powder, citric acid powder, EDTA powder, sodium sulfite powder and dipotassium hydrogen phosphate powder in water successively to obtain a mixed solution, and then fully stirring the mixed solution to obtain an electrolyte;

[0037]S2, use an ion sputtering apparatus to sputter a gold film 2 with a thickness of 15 nm on the conductive substrate 3, and use the liquid surface self-assembly method to prepare a polystyrene microsphere crystal template with a uniform diameter and a diameter of 500 nm, and then the polystyrene The vinyl microsphere crystal template is transferred to the conductive substrate 3 to obtain the conductive substrate 3 covered with the gold film 2 and the polystyrene microsphere crystal template in turn; the con...

Embodiment 2

[0040] S1, firstly weigh each group according to the weight ratio of silver nitrate powder, citric acid powder, EDTA powder, sodium sulfite powder and dipotassium hydrogen phosphate powder to water as 0.12:0.5:0.08:0.5:0.15:48 Dissolving silver nitrate powder, citric acid powder, EDTA powder, sodium sulfite powder and dipotassium hydrogen phosphate powder in water successively to obtain a mixed solution, and then fully stirring the mixed solution to obtain an electrolyte;

[0041] S2, use an ion sputtering apparatus to sputter a gold film 2 with a thickness of 20 nm on the conductive substrate 3, and use the liquid surface self-assembly method to prepare a polystyrene microsphere crystal template with a uniform diameter and a diameter of 2000 nm, and then the polystyrene The vinyl microsphere crystal template is transferred to the conductive substrate 3 to obtain the conductive substrate 3 covered with the gold film 2 and the polystyrene microsphere crystal template in turn; th...

Embodiment 3

[0044] S1, first weigh each group according to the weight ratio of silver nitrate powder, citric acid powder, EDTA powder, sodium sulfite powder and dipotassium hydrogen phosphate powder to water as 0.15:1.1:0.1:0.5:0.2:52 Dissolving silver nitrate powder, citric acid powder, EDTA powder, sodium sulfite powder and dipotassium hydrogen phosphate powder in water successively to obtain a mixed solution, and then fully stirring the mixed solution to obtain an electrolyte;

[0045] S2, use an ion sputtering apparatus to sputter a gold film 2 with a thickness of 30 nm on the conductive substrate 3, and use the liquid surface self-assembly method to prepare a polystyrene microsphere crystal template with a uniform diameter and a diameter of 5000 nm, and then the polystyrene The ethylene microsphere crystal template is transferred to the conductive substrate 3, and the conductive substrate 3 covered with the gold film 2 and the polystyrene microsphere crystal template in turn is obtain...

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Abstract

The invention discloses a cavity structure array assembled by silver nano particles and a preparation method and application thereof. The structure is composed of a conductive substrate and a silver nanostructure on it, wherein the silver nanostructure is a porous film stacked with silver nanoparticles, and the holes are a spherical cavity structure arranged in an orderly manner; the preparation method is to firstly combine silver nitrate powder, lemon Acid powder, ethylenediaminetetraacetic acid powder, sodium sulfite powder and dipotassium hydrogen phosphate powder are dissolved in water to obtain an electrolyte solution; then a 15-30nm thick gold film is sequentially sputtered and covered with one or more layers of polystyrene microsphere crystals The conductive substrate of the template is used as the cathode, and the graphite sheet is used as the anode to be electrodeposited in the electrolyte, and the target product is prepared on the conductive substrate. The prepared silver nanoparticle-assembled cavity structure array has three-dimensionally distributed SERS hot spots, high SERS sensitivity, capable of detecting Rhodamine 6G at concentrations as low as 1 fmol / L, and is extremely easy to be widely commercialized as a surface-enhanced Raman scattering activity. base.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a cavity structure array assembled by silver nanoparticles and a preparation method and application thereof. Background technique [0002] Surface-enhanced Raman scattering (SERS) technology can provide spectra with fingerprint information and is one of the most sensitive analytical detection techniques. SERS spectroscopy has a wide range of applications in the fields of chemistry, biology, medicine, and environmental testing. Currently, for the widespread application of SERS detection technology, one of the key issues to be solved is the development of substrates with high SERS activity and signal reproducibility. To this end, unremitting efforts have been made, for example, entitled "Green Synthesis of Large-ScaleHighly Ordered Core@Shell Nanoporous Au@Ag NanorodArrays as Sensitive andReproducible3D SERS Substrates", ACS Appl.Mater.Interfaces 2014,6,15667-15675 ("Green ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/16C23C14/18C23C14/34C25D3/46C25D5/02C25D5/48C25D5/54C23C28/02G01N21/65B82Y40/00
CPCC23C14/165C23C14/185C23C14/34C25D3/46C25D5/022C25D5/48C25D5/54C23C28/023G01N21/658B82Y40/00
Inventor 朱储红赵强生袁玉鹏杜海威
Owner ANHUI UNIVERSITY
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