SERS (Surface Enhanced Raman Scattering) substrate with gold and silver array structure and preparation method and application thereof

An array structure, gold-silver technology, applied in the SERS substrate of gold-silver array structure and its preparation field, can solve the problems that limit the application of SERS technology, the stability and repeatability of noble metal particles are difficult to guarantee, and achieve the effect of simple preparation method

Pending Publication Date: 2022-07-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability and reproducibility of free noble metal particles are difficult to guarantee
In addition, severe matrix interference in complex samples greatly limits the application of SERS technology

Method used

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  • SERS (Surface Enhanced Raman Scattering) substrate with gold and silver array structure and preparation method and application thereof
  • SERS (Surface Enhanced Raman Scattering) substrate with gold and silver array structure and preparation method and application thereof
  • SERS (Surface Enhanced Raman Scattering) substrate with gold and silver array structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1 provides a SERS substrate with a gold-silver array structure. The bottom diameter of the gold nanocone is about 65 nm and the height is 165 nm. The thickness of the silver nanofilm at the top of the cone is 36 nm and the thickness at the bottom of the cone is 45 nm. The preparation method is as follows:

[0046] The nickel metal foil with a thickness of 0.05mm was ultrasonically washed with acetone, ethanol, hydrochloric acid, and water for 15 minutes, and dried with nitrogen for use;

[0047] S1. Mix the cleaned substrate nickel metal foil with chloroauric acid (2wt%) and cetyltrimethylammonium bromide (20mg / mL), shake vigorously for 30s, grow at room temperature for 6h, and use Rinse three times with ethanol and water and dry to obtain the gold nanocone array substrate; the volume ratio of chloroauric acid and cetylammonium bromide is 1:4.

[0048] S2. The gold nanocone array substrate is placed in a magnetron sputtering machine, and the silver target is sp...

Embodiment 2

[0050] This embodiment provides a SERS substrate with a gold-silver array structure, and the preparation method thereof includes the following steps:

[0051] The nickel metal foil with a thickness of 0.05mm was ultrasonically washed with acetone, ethanol, hydrochloric acid, and water for 15 minutes, and dried with nitrogen for use;

[0052] S1. Soak the cleaned nickel metal foil into a mixed solution of cetylammonium bromide (20 mg / mL):chloroauric acid (2wt%) with a volume ratio of v / v=4:1, and shake vigorously After 30s, stand at room temperature for 4h, rinse with ethanol and water three times and dry to obtain the gold nanocone array substrate;

[0053] S2. The gold nanocone array substrate is then placed in a magnetron sputtering machine, and the silver target is vacuum magnetron sputtered at a power of 50 W for 120 s to obtain a SERS substrate with a gold-silver array structure.

Embodiment 3

[0055] This embodiment provides a SERS substrate with a gold-silver array structure, and the preparation method thereof includes the following steps:

[0056] The nickel metal foil with a thickness of 0.05mm was ultrasonically washed with acetone, ethanol, hydrochloric acid, and water for 15 minutes, and dried with nitrogen for use;

[0057] S1. Soak the cleaned nickel metal foil into a mixed solution of cetylammonium bromide (20 mg / mL):chloroauric acid (2wt%) with a volume ratio of v / v=4:1, and shake vigorously After 30s, stand at room temperature for 6h, rinse with ethanol and water three times and dry to obtain the gold nanocone array substrate;

[0058] S2. The gold nanocone array substrate is then placed in a magnetron sputtering machine, and the silver target is vacuum magnetron sputtered at a power of 50 W for 120 s to obtain a SERS substrate with a gold-silver array structure.

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Abstract

The invention relates to an SERS (Surface Enhanced Raman Scattering) substrate with a gold and silver array structure and a preparation method and application thereof. The SERS substrate comprises a metal substrate and a plurality of gold nanocones growing on the metal substrate, the surfaces of the gold nanocones are covered with silver nanofilms, and the gold nanocones are distributed in an array mode. The diameter of the cone bottom of the gold nanocone ranges from 40 nm to 100 nm, and the height of the gold nanocone ranges from 100 nm to 220 nm. The nanocone array structure has the characteristics of large surface area, large scattering area, high local electromagnetic field intensity and the like, and the stability and the electromagnetic field enhancement capability of the substrate can be greatly improved by growing the array substrate with controllable size, distribution and thickness on the metal foil. When used as an SERS substrate, the SERS substrate has the advantages of good uniformity, good reproducibility, high sensitivity, good stability and the like. The SERS substrate with the gold and silver array structure can be used for detecting organic matters.

Description

technical field [0001] The invention belongs to the technical field of surface-enhanced Raman spectroscopy, and in particular relates to a SERS substrate with a gold-silver array structure and a preparation method and application thereof. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is a non-destructive rapid detection technology that can use spectral fingerprints to identify molecules, so it is widely used in food safety, environmental analysis, real-time monitoring and other fields. Precious metal materials (gold, silver, copper, platinum, etc.) have shown excellent performance in the field of surface-enhanced Raman spectroscopy due to their unique optical and electrical properties. However, the stability and reproducibility of free noble metal particles are difficult to guarantee. In addition, severe matrix interferences in complex samples greatly limit the application of SERS technology. For the detection of trace substances, it is very impo...

Claims

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Application Information

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IPC IPC(8): G01N21/65C23C14/16C23C14/35C23C18/44C23C28/02
CPCG01N21/658C23C14/35C23C14/165C23C18/44C23C28/023
Inventor 李攻科赖华圣张卓旻
Owner SUN YAT SEN UNIV
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