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Platinum single-crystal surface cleaning and enhanced Raman signal acquisition method

A surface cleaning and Raman signal technology, which is applied in Raman scattering, measuring devices, instruments, etc., can solve the problem of interfering with target Raman signal acquisition, and achieve good universality, easy operation, and excellent results

Inactive Publication Date: 2017-11-21
SHENZHEN RES INST OF XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In SHINERS technology, by preparing a new type of Au@SiO 2 Nanoparticles to enhance the Raman signal of the single crystal interface, but in this process, since a variety of chemical reagents are used to prepare the nanoparticles, it is inevitable that there will be residues on the surface of the nanoparticles, which may interfere with the Raman signal of the target. collection, so the preparation and assembly of nanoparticles is a very critical technology

Method used

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  • Platinum single-crystal surface cleaning and enhanced Raman signal acquisition method
  • Platinum single-crystal surface cleaning and enhanced Raman signal acquisition method
  • Platinum single-crystal surface cleaning and enhanced Raman signal acquisition method

Examples

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Effect test

Embodiment 1

[0026] Example 1: specific synthesis steps of gold nano cores with a particle size of 50-100 nm. Add mass fraction of 0.01% HAuCl in a 500mL round bottom flask 4 , after heating and boiling, under the condition of constant stirring, quickly add a trisodium citrate aqueous solution with a mass fraction of 1%, and then the color of the solution first turns from light yellow to black, then quickly turns red, and then turns brown red. After boiling for 40 minutes, stop the reaction and cool to room temperature to obtain a brick-red Au NPs sol with a particle size of 50-100 nm.

Embodiment 2

[0027] Embodiment 2: A layer of 1-2 nm ultra-thin silica shell layer is coated on the surface of Au nanoparticles with a particle diameter of 50-100 nm. Take 30mL of the 50-100nm gold nanoparticle sol synthesized in Example 1 and add it to a round-bottomed flask, then add 0.1-1mL (3-aminopropyl)triethoxysilane (APTMS) solution respectively, and stir for 15min. Add 1~10mL NaSiO in sequence 3 Solution, stirred at room temperature and protected from light for 4 hours to obtain 1-2nm SiO 2 Shell. Take 1.5mL of sol and immediately cool it down, then transfer it into a centrifuge tube, centrifuge at 4000rpm for 10min, remove the mother liquor and then wash and centrifuge with ultrapure water to obtain a concentrated solution, dilute it to 0.5mL, and then drop it on Transmission electron microscope was carried out on the copper grid, and the obtained figure 1 .

Embodiment 3

[0028] Embodiment 3: Take the concentrated Au@SiO in embodiment 2 2 2 μL of nanoparticles were uniformly assembled on the surface of platinum single crystal cooled after high-temperature annealing, suspended horizontally and upside down, dried naturally, and then photographed by scanning electron microscope to obtain figure 2 .

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Abstract

The invention discloses a platinum single-crystal surface cleaning and enhanced Raman signal acquisition method, and relates to Raman scattering spectrums. The method comprises the following steps: synthesizing Au nanoparticles; by taking the Au nanoparticles as a core, wrapping the core with SiO2 as a shell layer, so as to obtain shell-partitioned nanoparticles; assembling the shell-partitioned nanoparticles on the surface of single crystal; removing impurities on the surfaces of the single crystal and the nanoparticles by using an electrochemical hydrogen evolution method; and by using a Raman spectrometer, acquiring a Raman spectrum of a species on the surface of the single crystal, thereby completing platinum single-crystal surface cleaning and enhanced Raman signal acquisition. The method has the advantages of simple and easy operation, high repeatability, excellent effect and the like.

Description

technical field [0001] The invention relates to Raman scattering spectroscopy, in particular to a method for cleaning the surface of a platinum single crystal and enhancing Raman signal collection. Background technique [0002] With the development of economy and society and the continuous increase of the global population, the energy and environmental problems caused by it are becoming more and more prominent. Therefore, searching for efficient, energy-saving and environmentally friendly new energy sources has become an urgent task for governments and scientists to solve. Fuel cells are considered to be an efficient and clean energy with the most commercial application value in the 21st century. Among the currently known catalysts for fuel cells, metal platinum has the best catalytic performance, and the research on catalytic reactions on platinum electrodes has long been a classic case in the field of electrochemistry. At the single crystal interface with a definite surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65G01N1/34
CPCG01N1/34G01N21/658
Inventor 李剑锋董金超
Owner SHENZHEN RES INST OF XIAMEN UNIV
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