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A SERS substrate material and its hot spot excitation method and characterization

A base material and hotspot technology, applied in the field of SERS base materials, can solve the problems that the expected effect cannot be fully achieved, difficult to synthesize metal nanomaterials, difficult to operate and control, etc., and achieve the effect of wide applicable wavelength range, low cost and mild conditions

Active Publication Date: 2016-11-30
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the SERS technology has achieved good development and the preparation of metal substrates is becoming more and more mature, there is still a problem: the preparation process of metal substrates with high enhancement factors is generally complicated, and the morphology of active substrates must be uniform and stable on a large scale. When the size of the nano-topography is at the nanometer level, or even a few nanometers, a strong local electromagnetic field can be generated, thereby triggering a strong SERS effect. However, ordinary experimental conditions are not easy to operate and control, and it is difficult to synthesize several nanometers. Metal nanomaterials with uniform structure
[0004] At present, most of the detection technologies for TNT and other explosives have some shortcomings, and cannot fully achieve the expected effect and meet the needs of explosives detection in actual work.

Method used

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  • A SERS substrate material and its hot spot excitation method and characterization
  • A SERS substrate material and its hot spot excitation method and characterization
  • A SERS substrate material and its hot spot excitation method and characterization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Step 1: Cut the silicon wafer into 1.5cm×1.5cm strips, ultrasonically clean them one by one with acetone, alcohol, and deionized water and dry them, and place them vertically in an airtight container for later use;

[0055] Step 2: Make a zinc seed layer on the clean silicon wafer in step 1, and evacuate the magnetron sputtering chamber to a chamber pressure of 1×10 -1 ~1×10 -4 mmHg, use metal zinc with a purity of 99.99% as the target to vapor-deposit the silicon wafers placed in the chamber of the magnetron sputtering instrument after step 1, and the vapor-deposition time is not less than 2 minutes;

[0056] Step three: through Zn(NO 3 ) 2 ·6H 2 O (purity of 99.998%) powder was dissolved in deionized water to prepare 0.025mol / L of Zn(NO 3 ) 2 Solution, prepare an equimolar hexamethylenetetramine (HMT) solution at the same time, put the silicon chip processed in step 2 into the mixed solution, the surface of the silicon chip needs to be completely immersed, and ca...

Embodiment 2

[0059] Immerse the substrate material prepared in Example 1 into the probe 4-ATP modification solution, the soaking time is controlled to 4-12 hours, and a surface monomolecular layer with probe molecules is obtained through self-assembly, and the monomolecular layer is passed through the mercapto group. Adsorbed on the ZnO-Ag surface of the base material to form a composite base material. Using water as the solvent to excite the hot spot, quantify 5 microliters to the central surface of the composite substrate material, and perform time-resolved Raman spectroscopy test at the same time, observe as follows: Figure 4 It can be found that the intensity of the Raman spectrum does not change substantially as shown by the change of the spectral intensity over time, while Figure 4 The small inset in the upper right corner is the experimental diagram of the contact angle between solvent water and the base material. As shown in the figure, the contact angle between water and the com...

Embodiment 3

[0061] Immerse the substrate material prepared in Example 1 into the probe 4-ATP modification solution, the soaking time is controlled at 4-12 hours, and a surface monomolecular layer with probe molecules is obtained through self-assembly, and the monomolecular layer is passed through the mercapto group. Adsorbed on the ZnO-Ag surface of the base material to form a composite base material. Using ethanol as the hot spot solvent, first test the contact angle between ethanol and the composite substrate material, such as Figure 5 The inset in the upper right corner shows that the contact angle between ethanol and the composite substrate is zero degrees, indicating that ethanol can completely wet the composite substrate material. Quantitatively add 5 microliters of ethanol to the central surface of the composite substrate material, and simultaneously perform time-resolved Raman spectrum testing to observe the changes in Raman spectrum intensity over time. Figure 5 It can be seen...

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Abstract

The invention discloses a base material, particularly a base material that can generate enhanced Raman effect to excite hot spots on the surface, and a method for generating extremely strong surface enhanced Raman effects by stimulating the hot spots during a transient process. and characterization of surface-enhanced Raman effects occurring during transient processes. The base material is constructed by in-situ growth of ZnO nanorod arrays on galvanized silicon wafers and then evaporation of Ag to create a surface structure that can produce enhanced Raman effect hot spots. It is further stimulated by the rational use of the capillary effect between a specific solvent and its surface structure. Enhance the Raman effect hotspot, and at the same time, the present invention also discloses the characterization means of the excitation method. The process of the invention is simple and stable, and the prepared base material can obtain a further enhanced Raman spectrum through the hot spot excitation method, making it highly sensitive and selective in explosive detection.

Description

technical field [0001] The invention relates to a SERS substrate material, in particular to a SERS substrate material that can generate enhanced Raman effect excitation hotspots on the surface and a SERS substrate material that can generate a very strong surface-enhanced Raman effect by exciting its hot spots in the transient process Methods and characterization of surface-enhanced Raman effects occurring during transients. Background technique [0002] Raman spectroscopy is a kind of scattering spectrum, which is derived from molecular vibration and rotation. From Raman spectroscopy, molecular vibration energy level and rotational energy level structure information can be obtained, so as to infer the structure and composition of molecules. Raman spectroscopy mainly has the following advantages: (1) It can directly obtain the information of groups and chemical bonds and the influence of microenvironment on the sample structure at the molecular level; (2) It is a non-destruct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B81C1/00B82Y40/00
CPCG01N21/658
Inventor 何璇王慧张祺
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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