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Polyvinyl alcohol-coated surface-enhanced Raman scattering substrate and preparation method thereof

A surface-enhanced Raman and polyvinyl alcohol technology, applied in the field of materials, can solve the problems of lower detection limit, inability to quench fluorescence, and difficulty in adsorption

Pending Publication Date: 2021-03-19
NINGXIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of substrate also has obvious disadvantages: silver nanoparticles are easily oxidized and vulcanized when exposed to air, and the substrate must be used immediately after preparation; it is difficult for unmodified bare gold / silver nanoparticles to adsorb various types of hydrophilic substances. Water-lipophilic molecules and volatile molecules make it difficult for these special types of molecules to be used for SERS detection; the bare and smooth substrate surface cannot quench the fluorescence produced by various fluorescent molecules, resulting in a significant drop in the detection limit of certain types of molecules ; After the dye molecules with strong adsorption capacity are adsorbed on the substrate, it is difficult to remove the residue of the substance, which leads to the phenomenon that the substrate cannot be reused, resulting in waste, etc.

Method used

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  • Polyvinyl alcohol-coated surface-enhanced Raman scattering substrate and preparation method thereof
  • Polyvinyl alcohol-coated surface-enhanced Raman scattering substrate and preparation method thereof
  • Polyvinyl alcohol-coated surface-enhanced Raman scattering substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] like figure 2 As shown, the method of coating polyvinyl alcohol by dipping and pulling coating includes the following steps:

[0047] (1) Prepare a high-temperature-resistant SG3 high-purity quartz plate with a size of 10mm×10mm×1mm, ultrasonically clean it with alcohol and pure water for 10 minutes, and then dry it in an oven at 95 degrees Celsius.

[0048] (2) The quartz sheet is placed in an ion sputtering coating machine, and a silver film about 10 nanometers thick is sputtered on the quartz sheet.

[0049] (3) Place the quartz sheet sputtered with a silver film in a vacuum rapid annealing furnace, rapidly raise the temperature to 900 degrees Celsius at a rate of 25 degrees Celsius per second, and naturally cool down to room temperature (20 degrees Celsius) after keeping the temperature for 5 minutes, and take it out to obtain annealing Silver nanoparticles substrate.

[0050] (4) Weigh 0.5 g of polyvinyl alcohol, pour it into 300 ml of pure water, heat to 95 deg...

Embodiment 2

[0054] like figure 2 As shown, the method of coating polyvinyl alcohol by dipping and pulling coating includes the following steps:

[0055] (1) Prepare a high-temperature-resistant SG3 high-purity quartz plate with a size of 10mm×10mm×1mm, ultrasonically clean it with alcohol and pure water for 10 minutes, and then dry it in an oven at 95 degrees Celsius.

[0056] (2) The quartz sheet is placed in an ion sputtering coating machine, and a gold film about 5 nanometers thick is sputtered on the quartz sheet.

[0057] (3) Place the quartz plate sputtered with a gold film in a vacuum rapid annealing furnace, rapidly raise the temperature to 900 degrees Celsius at a rate of 25 degrees Celsius per second, and naturally cool down to room temperature (20 degrees Celsius) after keeping the temperature for 5 minutes, and take it out to obtain annealed Gold nanoparticle substrate.

[0058] (4) Weigh 0.5 g of polyvinyl alcohol, pour it into 300 ml of pure water, heat to 95 degrees Cels...

Embodiment 3

[0062] like image 3 As shown, the spin coating method is used to coat polyvinyl alcohol, including the following steps:

[0063] (1) Prepare a high-temperature-resistant silicon wafer with a size of 10mm×10mm×1mm, ultrasonically clean it with alcohol and pure water for 10 minutes, and then dry it in an oven at 95 degrees Celsius.

[0064] (2) The silicon wafer is placed in a magnetron sputtering coating machine, and a silver film about 10 nanometers thick is sputtered on the silicon wafer.

[0065] (3) Place the silicon wafer sputtered with a silver film in a vacuum rapid annealing furnace, rapidly raise the temperature to 900 degrees Celsius at a rate of 25 degrees Celsius per second, and naturally cool down to room temperature (20 degrees Celsius) after keeping the temperature for 5 minutes, and take it out to obtain annealing Silver nanoparticles substrate.

[0066] (4) Weigh 0.5 g of polyvinyl alcohol, pour it into 300 ml of pure water, heat to 95 degrees Celsius and co...

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Abstract

The invention belongs to the technical field of materials, and relates to a polyvinyl alcohol-coated surface enhanced Raman scattering substrate and a preparation method thereof. The preparation method comprises the following steps of: (1) preparing a micro-nano gold / silver film on a surface; (2) performing annealing under a high-temperature condition to convert the gold / silver film into annealedgold / silver nanoparticles; and (3) dissolving polyvinyl alcohol to prepare a polyvinyl alcohol solution, and carrying out property coating modification on the annealed gold / silver nanoparticles by using the polyvinyl alcohol solution. The polyvinyl alcohol film provided by the invention can quench molecular fluorescence, can greatly improve the detection limit of a SERS substrate prepared by a physical annealing method, reduces direct contact between molecules and the gold / silver nano substrate, reduces detection substance residues, and ensures repeated utilization of the substrate; and the preparation method is simple in process and extremely low in cost.

Description

technical field [0001] The invention belongs to the field of material technology, and relates to a polyvinyl alcohol-coated surface-enhanced Raman scattering substrate and a preparation method thereof, in particular to a surface-enhanced Raman scattering substrate coated with polyvinyl alcohol on the surface of annealed gold / silver nanoparticles Substrates and methods for their preparation. Background technique [0002] Raman scattering phenomenon is a kind of light scattering phenomenon discovered accidentally by Indian physicist Raman in 1928. This scattering phenomenon widely exists in all molecules, whether it is gas, liquid or solid. This phenomenon is essentially a process of inelastic scattering between molecules and photons. Through this process, light interacts with matter, and photons transfer a part of their energy to molecules, converting them into the energy of molecular rotation and vibration (or conversely, molecules transfer their own rotation and vibration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 汪燕青马骏余蕊马燕王宏王小虎
Owner NINGXIA UNIVERSITY
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