Cavity structure array assembled by silver nanoparticles as well as preparation method and application of cavity structure array

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 affecting the uniformity and repeatability of SERS signals, complicated preparation steps, etc., and achieves guaranteed batch repeatability. high sensitivity, high SERS sensitivity, and simple operation

Active Publication Date: 2020-10-16
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 nanoparticles as well as preparation method and application of cavity structure array
  • Cavity structure array assembled by silver nanoparticles as well as preparation method and application of cavity structure array
  • Cavity structure array assembled by silver nanoparticles as well as preparation method and application of cavity structure array

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, ethylenediaminetetraacetic acid powder, sodium sulfite powder and dipotassium hydrogen phosphate powder and water in a ratio of 0.1:0.5:0.06:0.3:0.12:50 Dissolve silver nitrate powder, citric acid powder, ethylenediaminetetraacetic acid powder, sodium sulfite powder and dipotassium hydrogen phosphate powder in water in sequence to obtain a mixed solution, and then fully stir the mixed solution to obtain an electrolyte solution;

[0037]S2, using an ion sputtering apparatus, sputtering a 15nm thick gold film 2 on a conductive substrate 3, using the liquid surface self-assembly method to prepare a polystyrene microsphere crystal template with a diameter of 500nm and a diameter of 500nm, and then 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...

Embodiment 2

[0040] S1, first weigh each group according to the weight ratio of silver nitrate powder, citric acid powder, ethylenediaminetetraacetic acid powder, sodium sulfite powder and dipotassium hydrogen phosphate powder to water in the ratio of 0.12:0.5:0.08:0.5:0.15:48 Dissolve silver nitrate powder, citric acid powder, ethylenediaminetetraacetic acid powder, sodium sulfite powder and dipotassium hydrogen phosphate powder in water in sequence to obtain a mixed solution, and then fully stir the mixed solution to obtain an electrolyte solution;

[0041] S2, using an ion sputtering device, sputtering a 20nm thick gold film 2 on a conductive substrate 3, using the liquid surface self-assembly method to prepare a polystyrene microsphere crystal template with a diameter of 2000nm and a diameter of 2000nm, and then 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 polystyre...

Embodiment 3

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

[0045] S2, using an ion sputtering device, sputtering a 30nm thick gold film 2 on a conductive substrate 3, using the liquid surface self-assembly method to prepare a polystyrene microsphere crystal template with a diameter of 5000nm and a diameter of 5000nm, and then 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...

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Abstract

The invention discloses a cavity structure array assembled by silver nanoparticles as well as a preparation method and application of the cavity structure array. The structure is composed of a conductive substrate and a silver nanostructure on the conductive substrate, the silver nanostructure is a porous film formed by stacking silver nanoparticles, and holes are of spherical cavity structures arranged in order; and the preparation method comprises the following steps that silver nitrate powder, citric acid powder, ethylenediaminetetraacetic acid powder, sodium sulfite powder and dipotassiumphosphate powder are dissolved in water to obtain an electrolyte, and then the conductive substrate sputtered with the gold film with the thickness of 15-30 nm and covered with one or more layers of polystyrene microsphere crystal templates in sequence serves as a cathode, a graphite flake serves as an anode to be placed in an electrolyte for electro-deposition, and a target product is prepared onthe conductive substrate. The prepared cavity structure array assembled by the silver nanoparticles has three-dimensionally distributed SERS hot spots, the SERS sensitivity is high, rhodamine 6G withthe concentration as low as 1 fmol / L can be detected, and the cavity structure array can be easily and widely commercialized to serve as an active substrate for surface-enhanced Raman scattering.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a cavity structure array assembled with silver nanoparticles and its preparation method and application. 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 detection. At present, for the widespread application of SERS detection technology, one of the key problems to be solved is to develop substrates with high SERS activity and good signal reproducibility. To this end, efforts have been made, for example, entitled "Green Synthesis of Large-Scale Highly Ordered Core@Shell Nanoporous Au@Ag NanorodArrays as Sensitive and Reproducible3D SERS Substrates", ACS Appl.Mater.Interfaces 2014, 6, 15667-15675 ("Green synthesis ...

Claims

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Application Information

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Patent Type & Authority Applications(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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