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Preparation method and application of raman substrate

A Raman substrate and conversion material technology, applied in the field of analytical chemistry, can solve the problems of less research and immature technology, and achieve the effects of improved system stability, convenient use, and good biocompatibility

Inactive Publication Date: 2017-11-03
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Therefore, the coupling of up-conversion materials and metal nanoparticles is very promising to solve the above problems, but there are few studies and the technology is not yet mature.

Method used

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  • Preparation method and application of raman substrate
  • Preparation method and application of raman substrate
  • Preparation method and application of raman substrate

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Embodiment approach

[0026] (1) Preparation of rod-shaped up-conversion material (UC): Weigh 0.7 g of sodium hydroxide and 8 mL of oleic acid and stir vigorously, add 8 mL of ethanol, and stir at room temperature to form a white viscous solution. Add 5mL of water and continue to stir, the solution starts to become clear, and at the same time, add 0.303g of sodium fluoride dissolved in 3ml of water to the reaction solution until homogeneous. Then add 1.56 mL of yttrium nitrate, 400 μL of ytterbium nitrate, and 40 μL of erbium nitrate with a concentration of 0.5 mol / L, stir for 20 minutes, transfer to the reaction kettle after homogenization, and react at a high temperature of 230 ° C for 12 hours. Cool to room temperature, centrifuge at 4000rpm for 5min, wash the product several times with absolute ethanol, put it into a vacuum drying oven at 60°C and dry for 12h.

[0027] (2) Up-conversion material surface-modified silica (UC@SiO 2 ) preparation: 50 mg of up-conversion material was dispersed in 8...

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Abstract

The invention relates to a preparation method and an application of a raman enhancement substrate based on a combination of a club-shaped upconversion material (UC) and an Au@Ag nanomaterial. A principle of the substrate is to use a characteristic that upconversion can absorb visible light emitted by near infrared light, so as to convert the near infrared light to visible light at a local plasma resonance frequency part of an Au@Ag nanoparticle; the local plasma resonance frequency of the Au@Ag nanoparticle is improved; and further, raman signal intensity is improved. The preparation method of the enhancement substrate particularly comprises the steps of preparation of the club-shaped upconversion material (UC), preparation of upconversion material surface modified silicon dioxide (UC@SiO2), preparation of the Au@Ag nanoparticle and assembly (UC@SiO2@Au@Ag) of UC@SiO2 and Au@Ag nanoparticle. The substrate has the maximum advantage that the substrate has a better enhancement effect that a substrate without the upconversion under the same condition, and the signal intensity is improved approximately by 11 times. The invention provides a raman spectrum detection method by taking UC@SiO2@Au@Ag as the substrate. Compared with the traditional raman substrate, the substrate has the very good enhancement effect and very wide application prospects.

Description

technical field [0001] The invention relates to a UC@SiO 2 The preparation method and application of @Au@Ag Raman substrate belong to the technical field of analytical chemistry. Background technique [0002] Hexamethylenetetramine (HTM) is an organic compound commonly used in the treatment of urinary tract infections. Because of its bactericidal effect, it is often illegally mixed into yuba, vermicelli and other foods to achieve the effects of whitening, keeping fresh, increasing taste and antiseptic, and can cover up spoilage. Although urotropine itself is low in toxicity, formaldehyde, its decomposition product, easily reacts with various chemical structure receptors in the body, causing damage to human kidneys, liver, digestive system, etc., and seriously endangering human health. [0003] Surface-enhanced Raman spectroscopy has become a very widely used spectroscopic tool due to its simple operation and fast detection speed, and has played an active role in rapid dete...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y30/00
CPCG01N21/658B82Y30/00
Inventor 方国臻佟蕊孙世明刘冰
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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