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SERS substrate material and hotspot excitation method and representation thereof

A substrate material and hotspot technology, applied in the field of SERS substrate materials, can solve the problems of difficulty in synthesizing metal nanomaterials, inability to fully achieve the expected effect, difficult operation and regulation, etc., and achieve the effect of wide applicable wavelength range, low cost and mild conditions

Active Publication Date: 2015-01-21
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 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, requiring that the morphology of the active substrate must be uniform and stable on a large scale, and a single The size of the nano-topography is at the nanometer level, or even several nanometers, to generate a strong local electromagnetic field, 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 they cannot fully achieve the expected results and meet the needs of explosives detection in actual work.

Method used

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  • SERS substrate material and hotspot excitation method and representation thereof
  • SERS substrate material and hotspot excitation method and representation thereof
  • SERS substrate material and hotspot excitation method and representation thereof

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, dry them, and place them vertically in a sealable container for later use;

[0055] Step 2: Make a zinc seed layer on the clean silicon wafer in Step 1, and evacuate the chamber of the magnetron sputterer to a chamber pressure of 1×10 -1 ~1×10 -4 mmHg, using metal zinc with a purity of 99.99% as the target to evaporate the silicon wafer placed in the chamber of the magnetron sputterer after completing step 1, and the evaporation time is not less than 2min;

[0056] Step 3: Pass Zn(NO 3 ) 2 ·6H 2 O (purity 99.998%) powder was dissolved in deionized water to prepare 0.025mol / L Zn(NO 3 ) 2 At the same time, prepare an equimolar number of hexamethylenetetramine (HMT) solution, put the silicon wafer processed in step 2 into the mixed solution, the surface of the silicon wafer needs to be completely immersed, and carry out a water bath c...

Embodiment 2

[0059] The substrate material prepared in Example 1 was immersed in the probe 4-ATP modification solution, and the immersion time was controlled to be 4-12 hours, and a surface monolayer with probe molecules was obtained by self-assembly. 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 conduct time-resolved Raman spectroscopy at the same time. Figure 4 The change of spectral intensity over time shown in Figure 4 The inset in the upper right corner is the experimental graph of the contact angle between the solvent water and the base material. As shown in the figure, the contact angle between water and the composite base material is at the maximum value, indicating that water cannot wet the base material.

Embodiment 3

[0061] The substrate material prepared in Example 1 was immersed in the probe 4-ATP modification solution, and the immersion time was controlled at 4-12 hours, and a surface monolayer with probe molecules was obtained by self-assembly. Adsorbed on the ZnO-Ag surface of the base material to form a composite base material. Using ethanol as the excitation "hot spot" solvent, the contact angle between ethanol and the composite substrate material was first tested, such as Figure 5 The inset in the upper right corner shows that the contact angle between ethanol and the composite substrate is zero, indicating that ethanol can completely infiltrate the composite substrate material. Quantify 5 microliters of ethanol to the central surface of the composite base material, and conduct time-resolved Raman spectroscopy tests at the same time, and observe the changes in the intensity of the Raman spectra over time. Figure 5 It can be seen that the intensity of the Raman spectrum has been ...

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Abstract

The invention discloses a substrate material and in particular relates to a substrate material capable of generating enhanced Raman effect excitation hotspot on the surface, a method for generating the extremely strong surface enhanced Raman effect through hotspot excitation in a transient process and representation of the surface enhanced Raman effect in the transient process. According to the substrate material, a surface structure capable of generating an enhanced Raman effect hotspot is constructed through Ag vapor deposition after in-situ growth of a ZnO nanometer rodlike array on a galvanized silicon wafer, and furthermore, the enhanced Raman effect hotspot can be excited through reasonable utilization of the capillary effect between a specific solvent and the surface structure; besides, the invention also discloses a representation method for the excitation method. The process is simple and stable, the prepared substrate material can acquire further-enhanced Raman spectrums through the hotspot excitation method, and the substrate material has high sensitivity and good selectivity in explosive detection.

Description

technical field [0001] The present invention relates to a SERS base material, especially a SERS base material that can generate enhanced Raman effect excitation "hot spots" on the surface and generate extremely strong surface enhancement by exciting the "hot spots" in the transient process Methods of Raman effects 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-destructive detection method; (3) It...

Claims

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Application Information

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Patent Type & Authority Applications(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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