Preparation method and application of automatic writing type SERS substrate

An automatic, substrate technology, applied in the field of analysis and detection, can solve the problems of poor substrate uniformity and repeatability, achieve good uniformity, improve repeatability and uniformity, and controllable writing shape

Pending Publication Date: 2021-06-11
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of SERS substrates by immersion method and direct writing method is easy to operate, but the uniformity and repeatability of the substrate are poor

Method used

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  • Preparation method and application of automatic writing type SERS substrate
  • Preparation method and application of automatic writing type SERS substrate
  • Preparation method and application of automatic writing type SERS substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Preparation of silver film / photo paper SERS substrate, the specific steps include:

[0062] S1: Use a pen to absorb the ultrasonic silver nano-ink (viscosity coefficient of 100cP), and fix the photo paper on the writing platform; when the ink viscosity coefficient is 100cP, a uniform writing effect can be obtained.

[0063] S2: Set the writing speed of the pen to 12000 μm / s, the height of the pen to 5 mm, and the shape of the writing to be a thin line with a length of 3 mm, distributed in the form of n rows×m columns, where n is 6 and m is 8. The distance between the upper, lower, left, and right sides of the thin lines is 1.5 cm.

[0064] S3: drying the prepared SERS substrate in a vacuum oven. The drying environment is air, and the drying temperature is 110°C. Drying time is 30min.

[0065] image 3 a is the field emission SEM image of photo paper, image 3 c is the field emission SEM image of the SERS substrate with photo paper as the substrate.

Embodiment 2

[0067] Preparation of silver film / painting paper SERS substrate, the specific steps include:

[0068] S1: Use a pen to absorb the ultrasonic silver nano-ink (viscosity coefficient of 100cP), and fix the drawing paper on the automatic writing operation platform; when the viscosity coefficient of the ink is 100cP, a uniform writing effect can be obtained.

[0069] S2: Set the writing speed of the pen to 10000 μm / s, the height of the pen to 4 mm, and the shape of the writing to be a thin line of 4 mm long, distributed in the form of n rows×m columns, where n is 6 and m is 8. The distance between the up, down, left, and right sides of the thin lines is 1.5 cm.

[0070] S3: drying the prepared SERS substrate in a vacuum oven. The drying environment is air, and the drying temperature is 100°C. Drying time is 30min.

[0071] image 3 b is the field emission scanning electron microscope image of drawing paper, image 3 d is the field emission SEM image of the SERS substrate with ...

Embodiment 3

[0073] The performance test of SERS substrate includes:

[0074] 1) Sensitivity test:

[0075] Take the SERS substrate prepared in Example 1, take 3 μL of different concentrations of thiram (tetramethylthiuram disulfide, CAS No. 137-26-8) solution and drop it on the SERS substrate, then randomly select points to measure the SERS spectrum, The result is as Figure 4 As shown in a, the minimum detection concentration of SERS substrate is 10 -10 mol / L, the intensity of Raman characteristic peaks decreases with the decrease of concentration, Figure 4 b is the linear fitting diagram of the characteristic peak intensity and concentration, from the graph we know that the characteristic peaks are 556, 1142, 1377cm -1 The linear correlation coefficients with concentration were 0.9490, 0.9303, 0.9956, respectively.

[0076] Take the SERS substrate prepared in Example 2, take 3 μL of different concentrations of malachite green solution and drop it on the SERS substrate, randomly sel...

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Abstract

The invention relates to a preparation method of an automatic writing type SERS substrate. The method comprises the following steps: carrying out ultrasonic treatment on metal nanoparticle printing ink, uniformly mixing, and putting into a pen; fixing a paper substrate and the pen to an automatic writing operation platform, and setting parameters of the automatic writing operation platform, wherein the parameters comprise the writing pattern shape, the writing speed and the distance between the pen point and the paper substrate; writing; drying the paper substrate with the metal nanoparticles attached to the surface to obtain an automatic writing type SERS substrate; and cutting the obtained SERS substrate, sealing and storing at normal temperature for later use, wherein the paper substrate is a bendable hydrophobic paper substrate, and the paper substrate does not need to be pretreated. The invention also relates to the automatic writing type SERS substrate prepared by the method. The automatic writing type SERS substrate has the advantages of simple and rapid preparation, low cost, high sensitivity, uniformity, stability and repeatability, and is suitable for trace detection of various substances.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to a preparation method and application of an automatic writing SERS substrate. Background technique [0002] When the incident light interacts with the material molecules, the molecules are forced to vibrate to produce scattered light, where the frequency of the scattered light is the same as that of the incident light is Rayleigh scattering, and the frequency of the scattered light is different from that of the incident light Lines are Raman scattering. Raman scattering spectrum is a characteristic fingerprint spectrum, which is related to the vibration and rotational energy levels of substance molecules, and can reflect the molecular composition and structural shape of the measured substance. It is a powerful tool for analyzing the structure of substances; , the detection sensitivity is low, which limits its application. [0003] The emergence of surface-enhanced Raman sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 肖桂娜段俊丽冯龙秀王昆
Owner SHANGHAI NORMAL UNIVERSITY
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