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Surface-enhanced Raman substrate with both stability and Raman intensity and preparation method of surface-enhanced Raman substrate

A surface-enhanced Raman and high-stability technology, which is applied in Raman scattering, superimposed layer plating, instruments, etc., can solve the problems that limit the practical application of silver-based SERS substrates, poor chemical stability of metallic silver, and low temperature resistance, etc. problems, to achieve excellent three-dimensional conformality, surface-enhanced Raman effect enhancement, and anti-oxidation effects

Pending Publication Date: 2022-05-17
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metallic silver has poor chemical stability, is easily oxidized and vulcanized in air, and is not resistant to high temperature, which limits the practical application of silver-based SERS substrates.

Method used

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  • Surface-enhanced Raman substrate with both stability and Raman intensity and preparation method of surface-enhanced Raman substrate
  • Surface-enhanced Raman substrate with both stability and Raman intensity and preparation method of surface-enhanced Raman substrate
  • Surface-enhanced Raman substrate with both stability and Raman intensity and preparation method of surface-enhanced Raman substrate

Examples

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Embodiment 1

[0028] A method for preparing a surface-enhanced Raman substrate with high stability and high Raman intensity, comprising the following steps:

[0029] (1) Ultrasonic clean the ITO glass with acetone, isopropanol, ethanol and deionized water for 5 minutes;

[0030] (2) Use 0.01M silver nitrate and 0.2M citric acid as the electrolyte, and the current density is 2mA / cm 2 , the deposition time is 180s, the metal dendrites are deposited on the substrate obtained above, rinsed with deionized water and dried naturally to obtain the following: figure 1 SEM images of silver dendrites shown;

[0031] (3) Transfer the above-mentioned silver dendrite substrate into the ALD reaction chamber, and deposit 5-50 cycles (0.85-8.5 nm) of zinc oxide film to form a zinc oxide-wrapped silver dendrite structure (silver metal dendrite@zinc oxide ), the parameters for ALD deposition of zinc oxide are: reaction chamber temperature: 80 o C, Reaction source: Deposit zinc oxide using diethyl zinc and ...

Embodiment 2

[0035] A method for preparing a surface-enhanced Raman substrate with high stability and high Raman intensity, comprising the following steps:

[0036] (1) Ultrasonic clean the ITO glass with acetone, isopropanol, ethanol and deionized water for 5 minutes;

[0037] (2) Use 0.01M silver nitrate and 0.2M citric acid as the electrolyte, and the current density is 2mA / cm 2 , the deposition time is 180s, rinse with deionized water and dry naturally;

[0038] (3) Transfer the above-mentioned silver dendrite substrate to the ALD reaction chamber, and deposit a 10-cycle (~1.7 nm) zinc oxide film to form a zinc oxide-wrapped silver dendrite structure. The parameters for ALD deposition of zinc oxide are:

[0039] Reaction chamber temperature: 80 o C;

[0040] Reaction source: Deposit zinc oxide using diethyl zinc and H 2 O, diethylzinc and H 2 O is room temperature;

[0041] Pulse and cleaning time: the pulse of the metal source and the water source is 2 s; after each metal source...

Embodiment 3

[0046] A method for preparing a surface-enhanced Raman substrate with high stability and high Raman intensity, comprising the following steps:

[0047] (1) Ultrasonic clean the ITO glass with acetone, isopropanol, ethanol and deionized water for 5 minutes;

[0048] (2) Use 0.01M silver nitrate and 0.2M citric acid as the electrolyte, and the current density is 2mA / cm 2 , the deposition time is 180s, rinse with deionized water and dry naturally;

[0049] (3) Transfer the above-mentioned silver dendrite substrate to the ALD reaction chamber, and deposit a 20-cycle (~3.4 nm) zinc oxide film to form a zinc oxide-wrapped silver dendrite structure. The parameters for ALD deposition of zinc oxide are:

[0050] Reaction chamber temperature: 80 o C;

[0051] Reaction source: Deposit zinc oxide using diethyl zinc and H 2 O, diethylzinc and H 2 O is room temperature;

[0052] Pulse and cleaning time: the pulse of the metal source and the water source is 2 s; after each metal source...

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Abstract

The invention discloses a surface-enhanced Raman substrate with both high stability and high Raman intensity and a preparation method thereof, belongs to the field of molecular recognition and nano preparation, and aims to solve the problem that the stability and the Raman signal intensity cannot be met at the same time in the conventional technology. The invention provides an innovative surface-enhanced Raman substrate with both stability and Raman intensity and a preparation method thereof. According to the preparation method, a silver dendritic crystal structure with nano-gaps is used, an oxide with uniform nanoscale thickness is introduced between the metal nano-gaps through atomic layer deposition, the thickness is accurately controlled, and the nano-gaps are not fully filled on the premise that silver is completely wrapped, so that the silver nano dendritic crystal structure wrapped by the ultrathin oxide is prepared. The protection layer in the structure not only can stabilize the metal silver substrate, but also can introduce an additional chemical enhancement effect, and meanwhile, the stability and Raman signal intensity of the SERS substrate are improved, so that the ultrathin oxide coated silver nano dendritic crystal structure has high stability and high Raman signal intensity at the same time.

Description

technical field [0001] The invention belongs to the fields of molecular recognition and nanometer preparation, and in particular relates to a surface-enhanced Raman substrate with high stability and high Raman intensity and a preparation method thereof. Background technique [0002] Raman spectroscopy is a spectroscopic technique for studying molecular vibrational energy levels, but the intensity of ordinary Raman spectroscopy is weak. Surface-enhanced Raman scattering (SERS) spectroscopy can enhance Raman signals by several orders of magnitude. Quantitative analysis technology has great application prospects. SERS enhancement mechanisms can be mainly divided into physical enhancement and chemical enhancement. Chemical enhancement is the charge transfer between the detection molecule and the substrate under the action of strong light, which leads to a SERS enhancement factor of about 10-100. The physical enhancement is based on the fact that precious metals such as gold an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/40C23C16/455C23C16/52C23C28/00C25D3/22G01N21/65
CPCC23C16/407C23C16/405C23C16/45527C23C16/52C25D3/22C23C28/322C23C28/345G01N21/658
Inventor 曹燕强王鑫鑫钱继松蒋立勇
Owner NANJING UNIV OF SCI & TECH
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