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Substrate for trace detection as well as preparation method and application of substrate

A substrate and silver substrate technology, applied in the direction of measuring devices, instruments, analytical materials, etc., can solve the problems of qualitative and quantitative detection interference of unknown detection substances, difficulties in identifying and identifying fingerprint peaks, high nano surface activity, etc., to achieve easy promotion and Large-scale production application, low cost, and the effect of improving sensitivity

Pending Publication Date: 2022-05-27
TSINGHUA UNIV +1
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  • Application Information

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Problems solved by technology

However, because metallic silver is easy to oxidize and sulfide, and the nanometer surface is highly active, it is easy to adsorb various molecules in the environment, which is specifically manifested in the appearance of impurity peaks that are difficult to calibrate on its blank substrate. The existence of these impurity peaks increases the detection of target Difficulties in identification and identification of fingerprint peaks of detected substances cause serious interference to qualitative and quantitative detection of unknown detected substances, and even lead to inability to use

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  • Substrate for trace detection as well as preparation method and application of substrate
  • Substrate for trace detection as well as preparation method and application of substrate
  • Substrate for trace detection as well as preparation method and application of substrate

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preparation example Construction

[0057] The embodiments of the present disclosure provide a method for preparing the above-mentioned substrate for surface-enhanced Raman scattering, that is, a surface modification method, such as figure 1 shown, including:

[0058] Step S1: using raw materials to configure a modification liquid containing halide ions;

[0059] Step S2: using the modification solution to modify the silver substrate having the silver nanostructure surface.

[0060] In an embodiment of the present disclosure, the halide ion includes at least one of chloride ion, bromide ion, and iodide ion.

[0061] In the embodiments of the present disclosure, the raw materials include at least one of lithium salts, sodium salts, potassium salts and acids corresponding to the halide ions. Any solution with halide ions can be used. This is not limited.

[0062] In the embodiments of the present disclosure, the concentration of halide ions in the modification solution is 0.1-10 mM.

[0063] In the embodiments...

Embodiment 1

[0080] After the ordinary silver-based SERS substrate is prepared, if no special protection measures are taken, there will be obvious impurity peaks during the storage and storage in the air (usually after 3 hours), which will seriously affect the subsequent sample pulling. Mann test, so we need to use modified methods to remove spurious peaks. First, the blank sample of the bare silver substrate before modification was subjected to Raman test, and the test was carried out by Optech ATR8300 Micro Raman Spectrometer (Xiamen, China), test parameters: integration time 2s, laser power 100mW, laser wavelength 785nm.

[0081] The Raman spectrum of the bare silver substrate before modification is measured as follows image 3 shown at 382cm -1 , 857cm -1 , 1131cm -1 , 1404cm -1 and 1606cm -1 There are obvious impurity peaks nearby, accompanied by multiple impurity peaks with weaker intensity (such as 2139cm -1 ), the attribution of these impurity peaks is difficult to accurately...

Embodiment 2

[0087] In order to verify the Raman enhancement effect of the silver substrate modified by chloride ions, methylene blue (MB) was used as the detection molecule for detection and evaluation. Immerse the silver substrate containing impurity peaks in a 10 mM KCl aqueous solution, the liquid level does not cover the surface of the silver substrate, take it out after soaking for 10 min, and gently dry the surface modification solution of the silver substrate with a rinsing ball. The UV lamp was activated for 1min, and then immersed in MB standard solution, the concentration of the standard solution was from 0.1ppb (μg / L) to 1ppm (mg / L), soaked for 5 minutes and then taken out, and the surface was gently dried with an ear-washing bulb. The filter paper absorbs the surrounding residual solution, and then is placed on the Raman spectrometer for detection. Test parameters: the integration time is 1s, the integration times are 1, the laser power is 400mW, and the laser wavelength is 53...

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Abstract

The present disclosure provides a substrate for surface enhanced Raman scattering, the substrate comprising: a silver substrate having a silver nanostructured surface; and the silver halide passivation layer is formed on the surface of the silver substrate. The invention also provides a preparation method of the substrate for surface enhanced Raman scattering and a method for carrying out surface enhanced Raman scattering trace detection by using the substrate.

Description

technical field [0001] The present disclosure relates to the field of Raman spectroscopic analysis, and more particularly, to a substrate for trace detection, a method for preparing the substrate, and a method for surface-enhanced Raman scattering trace detection using the substrate. Background technique [0002] Noble metals with nanoscale rough surfaces can produce significant surface-enhanced Raman scattering effects. Silver (Ag) is two orders of magnitude higher than gold (Au) due to its high electric field and low loss, and its unique surface plasmon properties make it more widely used. However, due to the easy oxidation and vulcanization of metallic silver, and the high nano-surface activity, it is easy to adsorb various molecules existing in the environment, which is manifested in the presence of impurity peaks that are difficult to calibrate on its blank substrate. The existence of these impurity peaks increases the target The difficulty of identifying and identifyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65C23C22/02C23C22/05
CPCG01N21/658C23C22/02C23C22/05
Inventor 凌云汉李世林罗彦张政军陈诚林鹰
Owner TSINGHUA UNIV
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