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Three-dimensional SnO2/Ag NPs Raman enhanced substrate, and preparation method and application thereof

A substrate and three-dimensional technology, applied in the field of three-dimensional SnO2/AgNPs Raman-enhanced substrate and its preparation, can solve the problem of low enhancement effect of semiconductor substrate, unsuitable detection of low-concentration samples, restrictions on the development and application of Raman detection technology, and high cost of materials, etc. problems, to achieve excellent detection sensitivity, high Raman enhancement effect, and wide application range

Active Publication Date: 2019-11-22
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the present inventors have found that although noble metal substrates have a significant enhancement effect, their material costs are expensive and the preparation process is complicated; semiconductor substrates are economical in cost but have a low enhancement effect and are not suitable for detecting low-concentration samples. The defect limitations of these substrates severely limit the Development and Application of Man Detection Technology

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  • Three-dimensional SnO2/Ag NPs Raman enhanced substrate, and preparation method and application thereof
  • Three-dimensional SnO2/Ag NPs Raman enhanced substrate, and preparation method and application thereof
  • Three-dimensional SnO2/Ag NPs Raman enhanced substrate, and preparation method and application thereof

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Effect test

Embodiment 1

[0053] A three-dimensional SnO 2 The preparation method of / Ag NPs Raman enhanced substrate comprises the following steps:

[0054] (1) SnO 2 preparation:

[0055] First, dissolve tin tetrachloride in distilled water to form a tin chloride solution, slowly add ammonia water (mass concentration 22%) to the solution and measure the pH of the solution with a pH meter until the pH value of the solution reaches 9, stirring continuously during this process.

[0056] Then move the pH-adjusted solution to the heating kettle, fasten the lid of the heating kettle, put the heating kettle in the oven, place it in an environment of 100°C for 1 hour to produce a white precipitate, centrifuge the white precipitate, and freeze-dry it for 24 hours. hours, repeat the above steps with deionized water and ethanol, and wash with water three times to obtain the alcohol-washed SnO 2 powder.

[0057] The SnO 2 The powder and n-butanol are mixed according to the ratio of 0.5g: 20ml, then transferr...

Embodiment 2

[0064] A three-dimensional SnO 2 The preparation method of / Ag NPs Raman enhanced substrate comprises the following steps:

[0065] (1) SnO 2 preparation:

[0066] First, dissolve tin tetrachloride in distilled water to form a tin chloride solution, slowly add ammonia water (20% mass concentration) to the solution and measure the pH of the solution with a pH meter until the pH value of the solution reaches 9, stirring continuously during this process.

[0067] Then move the adjusted pH solution to the heating kettle, fasten the lid of the heating kettle, put the heating kettle in the oven, and place it in an environment of 120°C for 50 minutes to produce a white precipitate, centrifugally filter the white precipitate, and freeze-dry for 22 hours , repeat the above steps with deionized water and ethanol, and wash with water three times to obtain alcohol-washed SnO 2 powder.

[0068] The SnO 2 The powder and n-butanol are mixed according to the ratio of 1.5g: 40ml, then tran...

Embodiment 3

[0075] A three-dimensional SnO 2 The preparation method of / Ag NPs Raman enhanced substrate comprises the following steps:

[0076] (1) SnO 2 preparation:

[0077] First, dissolve tin tetrachloride in distilled water to form a tin chloride solution, slowly add ammonia water (mass concentration 26%) to the solution and measure the pH of the solution with a pH meter until the pH value of the solution reaches 8, stirring continuously during this process.

[0078] Then move the adjusted pH solution to the heating kettle, fasten the lid of the heating kettle, and put the heating kettle in the oven, place it in an environment of 80°C for 2 hours to produce a white precipitate, centrifuge the white precipitate, freeze-dry for 25 hours, repeat the above steps with deionized water and ethanol, and wash with water three times to obtain the alcohol-washed SnO 2 powder.

[0079] The SnO 2 The powder and n-butanol are mixed according to the ratio of 0.3g: 15ml, then transferred to a th...

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Abstract

The invention relates to the technical field of Raman enhanced substrates, in particular to a three-dimensional SnO2 / Ag NPs Raman enhanced substrate, and a preparation method and an application thereof. The Raman enhanced substrate comprises a substrate body, a SnO2 film layer and Ag NPs, wherein the SnO2 film layer is attached to the surface of the substrate body, the surface of the SnO2 film layer is rough and forms a three-dimensional porous structure, the Ag NPs are dispersed on the SnO2 film layer and partially located in holes of the SnO2 film layer, and SnO2 and the Ag NPs jointly forma perovskite material. The three-dimensional (3D) SERS active substrate prepared by taking SnO2 as a substrate can provide a surface area larger than that of a smooth surface to adsorb nano-silver particles, so as to provide more reaction points for capturing more probe molecules to improve detection sensitivity. Moreover, the three-dimensional substrate structure has a light limiting effect, andcan accumulate and absorb scattered light in the substrate, so as to generate a higher Raman enhancement effect.

Description

technical field [0001] The invention relates to the technical field of Raman-enhanced substrates, in particular to a three-dimensional SnO 2 / Ag NPs Raman-enhanced substrate and its preparation method and application. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] Since the surface-enhanced Raman scattering (SERS) detection technology was proposed in the 1970s, because of its advantages such as high detection sensitivity and specificity, SERS has been used as a sensor and spectroscopic technology in chemical, biological sensing, and environmental sensing. It is widely used in monitoring surfaces and other fields, but the traditional Raman detection substra...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 王明辉郁菁周航余东方
Owner SHANDONG NORMAL UNIV
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