Polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate and preparation method thereof

A technology of polytrifluoropropylmethylsiloxane and trifluoropropylmethylsiloxane is applied in the field of polytrifluoropropylmethylsiloxane/silver composite surface-enhanced Raman substrate and its preparation. It can solve the problems of size, spacing and the effect of arranging the substrate, and achieve the effects of low cost, simple preparation process and good repeatability.

Inactive Publication Date: 2020-03-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to its high surface activity and other characteristics, silver nanoparticles are widely used in the preparation of surface-

Method used

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  • Polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate and preparation method thereof
  • Polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate and preparation method thereof
  • Polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Clean the glass piece, soak it in concentrated sulfuric acid for 3 hours, wash it with distilled water, then soak it in 1M NaOH for 2 hours, wash it with distilled water, and finally soak it in 0.1M HCl for 30 minutes, wash it with distilled water and put it at 120°C Oven dry overnight;

[0025] (2) Take 3g of methyltrimethoxysilane, add 2mL of trifluoroacetic acid (containing 5% water), shake and mix for 1 hour, then add 2.5g of polytrifluoropropylmethylsiloxane, shake and mix, and pipette Take 100 μL of the mixed solution with a gun and drop it on a glass slide, and let it dry naturally to form a film;

[0026] (3) Place the membrane described in step (2) in nitrobenzene solutions of different concentrations and vibrate at a constant temperature. After the adsorption reaches equilibrium, the absorbance is measured by ultraviolet spectrophotometry, and the polytrifluoropropylmethylsiloxane is calculated by the formula Adsorption capacity of p-nitrobenzene by alkan...

Embodiment 2

[0031] (1) The polytrifluoropropylmethylsiloxane obtained in Example 1 is placed in silver nanoparticle solutions of different concentrations and soaked for 24h to obtain polytrifluoropropylmethylsiloxane / silver containing different silver contents. Composite surface-enhanced Raman substrates.

[0032] (2) Immerse the obtained polytrifluoropropylmethylsiloxane / silver composite surface-enhanced Raman substrate in 10 -7 In the solution of the probe molecule (4-mercaptoaniline) of M concentration, the corresponding surface-enhanced Raman spectrum is obtained.

[0033] Polytrifluoropropylmethylsiloxane / silver composite surface-enhanced Raman substrate pairs prepared by the above-mentioned silver nanoparticles with different concentrations 10 -7 The Raman spectrum of the M concentration probe molecule (4-mercaptoaniline) is as follows figure 2 As shown (a.0.2mM; b.0.4mM; c.0.6mM; d.0.8mM; e.1.0mM), it can be seen that with the increase of the concentration of Ag nanoparticles, t...

Embodiment 3

[0036] (1) Soak the polytrifluoropropylmethylsiloxane obtained in Example 1 in a silver nanoparticle solution with a concentration of 0.2 mM for 24 hours to obtain a polytrifluoropropylmethylsiloxane / silver composite surface-reinforced coating. Mandi.

[0037] (2) The obtained polytrifluoropropylmethylsiloxane / silver composite surface-enhanced Raman substrate was immersed in different concentrations of nitrobenzene solutions, and the corresponding surface-enhanced Raman spectra were obtained.

[0038]The above prepared polytrifluoropropylmethylsiloxane / silver composite surface-enhanced Raman substrate is compared to the Raman confirmation spectrum of pure nitrobenzene Figure 5 Shown, respectively for polytrifluoropropylmethylsiloxane film, polytrifluoropropylmethylsiloxane film + pure nitrobenzene, silver nanoparticles + pure nitrobenzene, polytrifluoropropylmethylsiloxane Silicone / silver composite surface-enhanced Raman substrate + pure nitrobenzene for Raman detection, it ...

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Abstract

The invention discloses a polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate and a preparation method thereof. According to the method, by means of the enrichment effect of polytrifluoropropyl methyl siloxane on nitrobenzene pollutants, a sol-gel method and an in-situ chemical reduction method are combined to form silver nanoparticles on the surface of a polytrifluoropropyl methyl siloxane film, wherein the silver nanoparticles are uniform in particle size and compact in arrangement; and therefore, the polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate can be prepared. The polytrifluoropropyl methyl siloxane film in the composite surface enhanced Raman substrate has a good enrichment effect on nitro pollutants in water and does not cause any interference to measurement. The polytrifluoropropyl methyl siloxane/silver composite surface enhanced Raman substrate has the advantages of good repeatability, controllable process, high sensitivity and low cost, and can be used for the surface-enhanced Raman spectroscopy measurement of various substances.

Description

technical field [0001] The invention belongs to the technical field of organic matter detection, and relates to a polytrifluoropropylmethylsiloxane / silver composite surface enhanced Raman substrate and a preparation method thereof. Background technique [0002] Surface-enhanced Raman scattering spectroscopy (SERS) technology is widely used in analytical chemistry, life science, medicine and other fields, and has the characteristics of fast response, accuracy and sensitivity, and no damage to samples. This method requires the use of metals such as Au, Ag, and Cu to prepare surface-enhanced Raman substrates with rough surfaces, and the Ag substrate has the best effect. [0003] Due to its high surface activity and other characteristics, silver nanoparticles are widely used in the preparation of surface-enhanced Raman spectroscopy substrates, but their size, spacing and arrangement will have a significant impact on the substrate effect. Since the prepared nano-silver particles...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 陆锐王青王连军李健生沈锦优孙秀云韩卫清刘晓东
Owner NANJING UNIV OF SCI & TECH
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