Method for preparing bulk molybdenum disulfide surface Raman-enhanced substrate through femtosecond lasers

A surface Raman-enhanced, molybdenum disulfide technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of complicated plasma treatment process, difficult preparation of molybdenum disulfide samples, low efficiency, etc. The effect of convenient process, low cost and high efficiency

Active Publication Date: 2019-07-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanjing University of Posts and Telecommunications Research Group (Su S, Zhang C, Yuwen L, et al. Creating SERS Hot Spots onMoS 2 Nanosheets with in Situ Grown Gold Nanoparticles[J].Acs Appl MaterInterfaces,2014,6(21):18735-18741.)Use single-layer molybdenum disulfide combined with gold nanoparticles as Raman substrate to obtain higher surface Raman enhancement effect, but this method has a strong background spectrum and cannot avoid the reaction between the surface metal nanoparticles and the detected substance; Nanyang Technological Research Group (Sun L, Hu H, Zhan D, et al. 2 nanoflakes for surface enhanced raman scattering.[J].Small,2014,10(6):1090-1095.) use plasma to treat single-layer and few-layer molybdenum disulfide to obtain surface Raman-enhanced substrates, but using this method, The preparation of molybdenum disulfide samples is difficult, and the plasma treatment process is complicated; 2 [J].The Journal of Physical Chemistry C,2018,122(26):14467-14473.) Raman-enhanced substrates were prepared on bulk molybdenum disulfide by heat treatment, and a good enhancement effect was obtained, but this This method is time-consuming and less efficient

Method used

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  • Method for preparing bulk molybdenum disulfide surface Raman-enhanced substrate through femtosecond lasers
  • Method for preparing bulk molybdenum disulfide surface Raman-enhanced substrate through femtosecond lasers
  • Method for preparing bulk molybdenum disulfide surface Raman-enhanced substrate through femtosecond lasers

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Embodiment 1

[0023] A method for preparing a Raman-enhanced substrate on the surface of bulk molybdenum disulfide by femtosecond laser, the specific steps are as follows:

[0024] Step 1: Peel off the bulk molybdenum disulfide sample 11 with adhesive tape, paste it on the glass slide, and fix the glass slide on the six-dimensional mobile platform 12;

[0025] Step 2: Adjust the optical path of the femtosecond laser system 1 to ensure that the laser can be vertically incident on the surface of the horizontally placed sample 12;

[0026] Step 3: Adjust the half-wave plate 2 to make the laser power reach 8mW, and set the femtosecond laser system 1 to single-pulse trigger mode;

[0027] Step 4: Imaging is carried out by means of the imaging CCD 9 and the white light source 7, and the surface morphology and processing process of the processed material are observed. With the on-off of the mechanical switch 4, the processing can be performed on the sample surface 11 at a specified area and at a s...

Embodiment 2

[0036] The method is the same as in Example 1, and the laser energy is adjusted to 10mW;

[0037] The processing device is the same as in Example 1. After adjusting the optical path, adjust the angle of the molybdenum disulfide sample so that it forms an angle of 45° with the incident light, and the processing area is elliptical;

[0038] Processing process: control the movement of the translation stage, trigger the laser every 60 μm, and finally obtain a micro-nano composite structure on the surface of bulk molybdenum disulfide in a 2×3 array. Each elliptical area in the array can measure the same concentration or different concentrations. Processing results such as image 3 shown.

[0039] The processing lens of the patent of the present invention is not limited to use, and a surface Raman-enhanced substrate of any shape can be obtained on the surface of any bulk molybdenum disulfide material through different lenses, and can be prepared in a large area and at a high speed. ...

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Abstract

The invention relates to a method for preparing a bulk molybdenum disulfide surface Raman-enhanced substrate through femtosecond lasers, and belongs to the field of application of functional surfaces.According to the method, bulk molybdenum disulfide which is cheap and easy to obtain is used as a sample, so that it is ensured that the lasers can perpendicularly enter the surface of the horizontally-placed sample; a laser device is set to a single-pulse trigger mode; a laser ablation area can be adjusted by adjusting the focal length of a plano-convex lens; and the shape of the laser ablationarea can be achieved by adjusting the angle between the sample and the incident lasers. According to the method, a micro-nano composite structure is ablated on the surface of the bulk molybdenum disulfide by means of the non-equilibrium characteristic of femtosecond laser processing, the material property of the molybdenum disulfide is modified, and thus, the molybdenum disulfide can be used as anefficient surface Raman-enhanced substrate. The method has the advantages that the preparation process is simple and rapid, the sample is cheap and easy to obtain, and the performance is stable and efficient; and an economical, simple, controllable and efficient preparation method is provided for preparing the surface Raman-enhanced substrate, and industrialization is facilitated.

Description

technical field [0001] The invention relates to a method for preparing a bulk molybdenum disulfide surface Raman enhanced substrate by a femtosecond laser, and belongs to the field of functional surface applications. Background technique [0002] Surface Enhanced Raman Scattering (SERS) is a very powerful analytical tool with wide applications in the fields of spectroscopy, analytical science, surface science and biological science. Molybdenum disulfide, as a new two-dimensional material, has important applications in the preparation of surface Raman-enhanced substrates. Professor Dresselhaus of Massachusetts Institute of Technology (Ling X, Fang W, Lee Y H, et al. Raman Enhancement Effect on Two-Dimensional Layered Materials: Graphene, h-BN and MoS 2 [J].Nano Letters,2014,14(6):3033.) reported that almost all two-dimensional materials have a certain surface Raman enhancement effect when they are thinned to a single layer. Nanjing University of Posts and Telecommunications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/352B23K26/064B23K26/03
CPCB23K26/032B23K26/064B23K26/0648B23K26/352
Inventor 姜澜潘昌基孙靖雅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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