Preparation method and gas detection method of surface-enhanced Raman scattering base material

A surface-enhanced Raman and substrate material technology, which is applied in Raman scattering, material analysis, material excitation analysis, etc., can solve the difficulty of ensuring the quality consistency of respiratory sensors, the difficulty of realizing SERS detection of molecules, and the reliability of preparation methods to be discussed, etc. problem, achieve high sensitivity and pertinence, less steps, and improve accuracy and sensitivity

Active Publication Date: 2018-05-25
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are two problems in SERS gas detection: one is that gas molecules are fast-moving, and it is difficult to adsorb on the surface of a planar substrate; Molecules that are difficult to detect by SERS
However, the preparation of the breath sensor involves the use of hydrazine as a reducing agent to reduce graphene oxide. It is difficult to ensure the consistency of the quality of the breath sensor prepared in each batch, and the reliability of the preparation method is questionable.

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  • Preparation method and gas detection method of surface-enhanced Raman scattering base material
  • Preparation method and gas detection method of surface-enhanced Raman scattering base material
  • Preparation method and gas detection method of surface-enhanced Raman scattering base material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Preparation method of surface-enhanced Raman scattering substrate material:

[0081] (1) Dissolve 100 mg of silver nitrate in 10 mL of water to obtain an aqueous solution of silver nitrate, place the copper sheet in the silver nitrate solution, react at room temperature for 1 h, add ethanol after the reaction, and centrifuge to obtain dendritic silver nanocrystals.

[0082] The morphology of the dendritic silver nanocrystals obtained above is analyzed and detected, the SEM morphology is shown in Figure 2, and the TEM is shown in Figure 3. According to the test results, it can be seen that the dendritic silver nanocrystals prepared have a highly symmetrical structure, and the structure of the dendritic silver nanocrystals includes a main trunk with a length of 5-60 μm and a diameter of 50-2000 nm; side branches with a length of 0.5-40 μm and a diameter of 25-1000 nm; and these side branches are parallel to each other and connected to the trunk The angle between them is 5...

Embodiment 2

[0091] Preparation method of surface-enhanced Raman scattering substrate material:

[0092] (1) Dissolve 340 mg of silver nitrate in 10 mL of water to obtain an aqueous solution of silver nitrate, place the copper sheet in the silver nitrate solution, react at room temperature for 2 h, add ethanol after the reaction, and centrifuge to obtain dendritic silver nanocrystals.

[0093] The morphology of the dendritic silver nanocrystals obtained above was analyzed and detected, and the SEM morphology was consistent with Example 1. The dendritic silver nanocrystals prepared had a highly symmetrical structure, including: long 5-60 μm, diameter 50-2000nm Trunk; side branches with a length of 0.5-40 μm and a diameter of 25-1000 nm; and these side branches are parallel to each other, and the angle between them and the main body is 50°-70°.

[0094] The high-resolution TEM of dendritic silver nanocrystals is consistent with that of Example 1, and the interplanar spacing of the trunk and si...

Embodiment 3

[0102] Preparation method of surface-enhanced Raman scattering substrate material:

[0103] (1) Dissolve 3.4 mg of silver nitrate in 10 mL of water to obtain an aqueous solution of silver nitrate, place the copper sheet in the silver nitrate solution, react at room temperature for 3 h, add ethanol at the end of the reaction, and centrifuge to obtain dendritic silver nanocrystals.

[0104] The morphology of the dendritic silver nanocrystals obtained above was analyzed and detected, and the SEM morphology was consistent with Example 1. The dendritic silver nanocrystals prepared had a highly symmetrical structure, including: a length of 5-60 μm and a diameter of 50-2000 nm The main trunk; the side branches with a length of 0.5-40 μm and a diameter of 25-1000 nm; and these side branches are parallel to each other, and the angle between them and the main trunk is 50°-70°.

[0105] The high-resolution TEM of dendritic silver nanocrystals is consistent with that of Example 1, and the...

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Abstract

The invention belongs to the field of laser Raman detection technology and relates to a preparation method and application of a surface-enhanced Raman scattering base material. The preparation methodof the surface-enhanced Raman scattering base material comprises the following steps: (1) reducing a metal compound by using a reducing agent to obtain a dendritic metal nanocrystal; (2) placing the dendritic metal nanocrystal in an alcohol solution with a functionalized modified molecule to immerse and obtain a suspension of the functionalized modified dendritic metal nanocrystal; (3) dropping the suspension of the functionalized modified dendritic metal nanocrystal of the step (2) onto a solid substrate and evaporating solvents to obtain the surface-enhanced Raman scattering base material. The preparation method is simple and energy is saved, and the high-sensitivity SERS detection can be realized by the obtained surface-enhanced Raman scattering base material.

Description

technical field [0001] The invention belongs to the technical field of laser Raman detection, and in particular relates to a preparation method of a surface-enhanced Raman scattering base material and a gas detection method. Background technique [0002] The metabolism of human tissue cells produces volatile organic gases (VOCs), so the VOCs in human exhaled matter can reflect the health level of the human body. The expression of VOCs in lung cancer patients is quite different from normal people. Therefore, by detecting the content of VOCs in exhaled matter, it is expected to become a new, fast and non-destructive screening method for early lung cancer, which can buy valuable time for the treatment of lung cancer patients, reduce the pain of patients, and help the smooth completion of anticancer treatment . Aldehydes are an important class of VOCs in human exhaled matter, and can be used as respiratory markers to judge the metabolism of tissue cells, thereby realizing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 王铁张振乔学志
Owner INST OF CHEM CHINESE ACAD OF SCI
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