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Preparation method of high-sensitivity recyclable SERS (surface enhanced Raman spectroscopy) substrate

A surface-enhanced Raman and high-sensitivity technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of expensive equipment costs, unsuitable for batch production and industrialization, and achieve low cost, good uniformity, and excellent preparation methods simple effect

Inactive Publication Date: 2015-12-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, atomic deposition technology requires expensive equipment and is not suitable for mass production and industrialization

Method used

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  • Preparation method of high-sensitivity recyclable SERS (surface enhanced Raman spectroscopy) substrate
  • Preparation method of high-sensitivity recyclable SERS (surface enhanced Raman spectroscopy) substrate
  • Preparation method of high-sensitivity recyclable SERS (surface enhanced Raman spectroscopy) substrate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Tetrabutyl titanate, absolute ethanol, deionized water, triethanolamine and glacial acetic acid with a molar ratio of 3:44:8:3:1 were mixed (the weighed masses were 10.2g, 20.3g, 1.4g , 4.5g, 0.5g), and a polyethylene glycol (0.019g) solution with a mass fraction of 0.06% was added, and stirred for 4 hours at room temperature to finally obtain a uniform, transparent light yellow sol. Drop the obtained sol on the surface of a clean glass sheet, spin-coat it at 3000rev / min for 15s with a homogenizer, dry it at room temperature for 30min, heat it in a muffle furnace to 530°C at a heating rate of 5°C / min, and keep it for 1h Then cool naturally. Mix 1 ml of 2.5% silver nitrate and 0.5% sodium citrate, and then dissolve in 10 ml of deionized water to obtain a reaction solution. Soak the nano-titanium dioxide-coated substrate in the reaction solution, irradiate it with a 100w high-pressure ultraviolet mercury lamp for 0.5h, take it out after the reaction stops, rinse it with ...

Embodiment 2

[0028] Example 2: Tetrabutyl titanate, absolute ethanol, deionized water, triethanolamine and glacial acetic acid were mixed with a molar ratio of 2:44:8:2:1 (the weighed masses were 6.8g, 20.3 g, 1.4g, 3.0g, 0.5g), and a solution of polyethylene glycol (0.022g) with a mass fraction of 0.06% was added, and stirred for 4 hours at room temperature to finally obtain a uniform, transparent light yellow sol. Drop the obtained sol on the surface of a clean silicon wafer, spin coat it at 1000rev / min for 15s with a homogenizer, dry it at room temperature for 30min, heat it in a muffle furnace to 500°C at a heating rate of 5°C / min, and keep it for 2h Then cool naturally. Mix 1 ml of 2.5% silver nitrate and 0.5% sodium citrate, and then dissolve in 10 ml of deionized water to obtain a reaction solution. Soak the nano-titanium dioxide-coated substrate in the reaction solution, and irradiate it with a 100w high-pressure ultraviolet mercury lamp for 0.5h. After the reaction stops, take it...

Embodiment 3

[0031] Tetrabutyl titanate, absolute ethanol, deionized water, triethanolamine and glacial acetic acid with a molar ratio of 2:44:8:2:1 were mixed (the weighed masses were 6.8g, 20.3g, 1.4g , 3.0g, 0.5g), and a solution of polyethylene glycol (0.026g) with a mass fraction of 0.08% was added, stirred at room temperature for 4h, and finally a uniform, transparent light yellow sol was obtained. Drop the obtained titanium dioxide sol on the clean glass surface, spin coat it at 1000rev / min for 15s with a homogenizer, dry it at room temperature for 30min, place it in a muffle furnace and heat it to 500°C at a heating rate of 5°C / min, and keep it for 2h Then cool naturally. 1 ml of 0.5% silver nitrate and 0.1% sodium citrate were mixed, and then dissolved in 10 ml of deionized water to obtain a reaction solution. Soak the nano-titanium dioxide-coated substrate in the reaction solution, irradiate it with a 100w high-pressure ultraviolet mercury lamp for 1 hour, take it out after the ...

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Abstract

The invention relates to a preparation method of a high-sensitivity recyclable SERS (surface enhanced Raman spectroscopy) substrate. According to the method, a porous titanium dioxide coating is prepared on a substrate with sol-gel and spin-coating methods, nano silver particles are deposited in porous titanium dioxide with a photochemical reducing method, and a silver / titanium dioxide composite coating material is obtained. A silver / titanium dioxide composite coating prepared with the preparation method has the LOD (limit of detection) of 10<-10> mol / L for crystal violet and methylene blue, trace organic matters adsorbed on the surface of the substrate are effectively degraded, the substrate is recycled, and the preparation method has the advantages that the preparation method is simple and the substrate is good in uniformity, high in repeatability, high in detection sensitivity and recyclable.

Description

technical field [0001] The invention belongs to the field of Raman spectroscopic substrates, and relates to a highly sensitive recyclable Ag / TiO 2 Preparation method of composite coating surface-enhanced Raman spectroscopy substrate. Background technique [0002] Anatase titanium dioxide has been widely favored by researchers, mainly because it is a good photocatalyst and has a wide range of applications in the field of photodegradation of organic pollutants and new generation of solar cells. When noble metal nanoparticles are combined with anatase-type titanium dioxide, the energy level of titanium dioxide is changed due to the photoinduced electron transfer process between the semiconductor and the metal, and the catalytic effect is greatly enhanced by the separation of holes and electrons. improve. When some molecules are adsorbed on or close to some rough metal surfaces, such as silver, copper, gold and other surfaces, their Raman signal intensity will increase by 10 ...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 王田禾俞佳杰张正义
Owner NANJING UNIV OF SCI & TECH
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