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A method for fabricating surface-enhanced Raman substrates based on localized optical field-enhanced femtosecond laser photoreduction

A surface-enhanced Raman and femtosecond laser technology, applied in Raman scattering, material excitation analysis, nanotechnology, etc., can solve problems such as dispersion of gold nanostructures, and achieve enhanced enhancement factor, reduced size, and good chemical stability. Effect

Active Publication Date: 2021-06-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, both methods have a common defect that the generated gold nanostructures are always dispersed in the solution

Method used

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  • A method for fabricating surface-enhanced Raman substrates based on localized optical field-enhanced femtosecond laser photoreduction
  • A method for fabricating surface-enhanced Raman substrates based on localized optical field-enhanced femtosecond laser photoreduction
  • A method for fabricating surface-enhanced Raman substrates based on localized optical field-enhanced femtosecond laser photoreduction

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Embodiment 1

[0035] A method for fabricating a surface-enhanced Raman substrate based on femtosecond laser photoreduction based on localized light field enhancement, the steps of which are as follows:

[0036] (1) build as figure 1 The femtosecond laser processing system shown;

[0037] (2) if figure 2 As shown in (a), in air, a single-pulse femtosecond laser is used to fabricate a flat silicon substrate such as image 3 The large-area surface periodic structure shown;

[0038] (3) if figure 2 As shown in (b), the silicon substrate with the surface periodic structure processed once is placed in a cuvette, and HAuCl is added to the cuvette 4 and KNaC 4 h 4 o 6 The mixed solution until the substrate is submerged, and then a second scan is performed in the surface periodic structure area at the solid-liquid interface to achieve photoreduction;

[0039] (4) After a two-step experimental process, a large number of gold nanoparticles are attached to the surface periodic structure. By ...

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Abstract

The invention relates to a method for manufacturing a surface-enhanced Raman substrate based on femtosecond laser photoreduction based on localized light field enhancement, and belongs to the technical field of Raman molecular detection substrate preparation. It includes the following steps: (1) using femtosecond laser in air to process large-area surface periodic structures on planar silicon substrates; (2) using HAuCl 4 and KNaC 4 h 4 o 6 In the environment of the mixed solution, a second scan is performed on the surface periodic structure processed in the previous step. After these two steps, in the second step of laser scanning, photoreduction will occur in the area where the light field of the surface periodic structure is enhanced. By controlling the laser parameters, gold nanoparticles with controllable morphology, uniform spatial distribution, and strong chemical stability can be prepared. ‑ Micron particles. The gold nanoparticle Raman-enhanced substrate prepared by this method has high sensitivity, and the Raman-enhanced region can be patterned by controlling the laser scanning path.

Description

technical field [0001] The invention relates to a method for manufacturing a surface-enhanced Raman substrate based on femtosecond laser light reduction based on localized light field enhancement, and belongs to the technical field of Raman spectrum molecular detection. Background technique [0002] Raman scattering spectroscopy characterizes inelastic collisions between light and matter. In the 1970s, researchers discovered that surface-enhanced Raman scattering (SERS) would form when the substance to be tested was adsorbed on a rough noble metal surface. Since SERS, as an ultrasensitive, label-free optical detection technology, can simultaneously detect many different molecules through unique spectra, it has provided new strategies for bioanalysis and in situ detection in recent years. Compared with bulk metals, noble metal nanostructures exhibit interesting plasmon-dominated optical properties due to the resonance of conduction electrons with incident light, a phenomenon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B82Y40/00
Inventor 姜澜李晨胡洁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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