Hierarchical nano-cone array for in-situ monitoring of chemical reactions by surface-enhanced Raman scattering and preparation method thereof

A surface-enhanced Raman and chemical reaction technology, used in Raman scattering, material excitation analysis, etc., can solve the problems of complex synthesis and preparation of nanoparticle composite materials, rarely prepared, and weakened SPR effect of metal cores. Application value and practical potential, high success rate, simple operation effect

Active Publication Date: 2019-06-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the shell thickness increases, the SPR effect of the metal core will be significantly weakened, so it is difficult for this method to strike a balance between high catalytic efficiency and SERS enhancement.
At the same time, the synthesis and preparation process of nanoparticle composites is complicated, and in situ SERS research materials with large active sites applied to the gas-solid interface have rarely been prepared.

Method used

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  • Hierarchical nano-cone array for in-situ monitoring of chemical reactions by surface-enhanced Raman scattering and preparation method thereof
  • Hierarchical nano-cone array for in-situ monitoring of chemical reactions by surface-enhanced Raman scattering and preparation method thereof
  • Hierarchical nano-cone array for in-situ monitoring of chemical reactions by surface-enhanced Raman scattering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of hydrophilic glass sheet

[0037] Use a glass knife to cut the glass slices into 2.5cm long and 2cm wide sizes, and ultrasonicate the cut glass slices with hexane, acetone, ethanol (or isopropanol), and deionized water for 3 minutes, and then wash the slices Put it into a large beaker, add hydrogen peroxide with a mass fraction of 30%, and then slowly add concentrated sulfuric acid with a mass fraction of 98% (volume ratio of concentrated sulfuric acid to hydrogen peroxide is 7:3), heat to boil, adjust the heating power, and keep boiling for 10 minutes to obtain Hydrophilic glass substrate; the resulting hydrophilic glass was rinsed with deionized water for about 5 times, and dried with nitrogen.

Embodiment 2

[0038] Embodiment 2: the preparation of polystyrene film

[0039] Spin-coat the toluene solution of polystyrene with a concentration of 10 mg / mL on the hydrophilic glass sheet substrate obtained by using a desktop homogenizer (3000 rpm, 30 seconds), and then place it in an oven at 60 ° C for 10 minutes , take it out and place it at room temperature to obtain a polystyrene film with a thickness of 20 nm.

Embodiment 3

[0040] Embodiment 3: Preparation of hydrophobic polystyrene microspheres

[0041] At room temperature, add 6 mL of deionized water to 2 mL of 5 wt % polystyrene microsphere dispersion with a diameter of 3 μm, sonicate at 100% power (100 W) for 15 minutes, and then centrifuge at 8900 rpm for 15 minutes to obtain a precipitate Add 6 mL of deionized water to the precipitated product, sonicate, centrifuge, and then repeat this process 8 times. Add 3 mL of ethanol and 3 mL of deionized water to the precipitated product obtained last time, sonicate for 15 minutes, then centrifuge at 8900 rpm for 15 minutes, suck out the supernatant, and add the same volume of ethanol and deionized water to the precipitated product The water mixture was ultrasonically treated and centrifuged in the same way, and this process was repeated 8 times. After the supernatant was drawn for the last time, 1 mL of ethanol and 1 mL of deionized water were added to the precipitated product to obtain a hydrophobi...

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Abstract

The invention discloses a hierarchical nano-cone array for in-situ monitoring of chemical reactions by surface-enhanced Raman spectroscopy and a preparation method thereof, and belongs to the technical field of surface-enhanced Raman spectroscopic materials. The invention relates to a colloidal microsphere interface assembly method, a mask etching method and a physical vapor deposition method. Thewhole process is low in consumption, efficient and highly controllable. Through combination of colloidal etching and a physical vapor deposition technology, a hierarchical nano-cone array with a large-area in-situ surface-enhanced Raman spectroscopy study active sites can be prepared. Trace detection of analytes can be realized on the surface of the nano-cone array, and the strong surface plasmonresonance effect provided by the nano-cone array also has a significant application value for catalytic degradation of organic dye molecules. Furthermore, by combining the intrinsic ultra-sensitive monitoring property and catalytic performance, the structure can realize in-situ surface-enhanced Raman spectroscopy study of plasma-induced photocatalytic degradation reactions.

Description

technical field [0001] The invention belongs to the technical field of surface-enhanced Raman scattering materials, and in particular relates to a hierarchical nanocone array for in-situ monitoring of chemical reactions by using surface-enhanced Raman spectroscopy and a preparation method thereof. Background technique [0002] Surface-Enhanced Raman Scattering (SERS) refers to a vibrational spectroscopy technique that utilizes metal nanostructure surface plasmon resonance (Surface Plasmon Resonance, SPR) to enhance Raman scattering of analytes [1,2] . Due to its ultrasensitive molecular detection properties, SERS has a wide range of applications in surface science. In addition to fundamental research in substrate preparation, recent reports have shown that SERS, when combined with catalysis, can serve as an effective tool for monitoring chemical reactions in situ, an area of ​​research known as in situ SERS studies. [3,4] . [0003] The field of in situ SERS research has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 张刚管昱多
Owner JILIN UNIV
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