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A self-assembled three-dimensional copper Raman-enhanced substrate and its preparation method and application

A self-assembly, three-dimensional technology, applied in the direction of Raman scattering, measuring devices, instruments, etc., can solve problems affecting the accuracy and sensitivity of Raman spectroscopy, complex pre-processing processes, etc., to achieve the effect of reducing application costs and overcoming high costs

Active Publication Date: 2019-11-15
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, hybrid organic molecules will affect the accuracy and sensitivity of Raman spectroscopy, and ordinary self-assembled structures as Raman-enhanced substrates require complex pre-treatment processes

Method used

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  • A self-assembled three-dimensional copper Raman-enhanced substrate and its preparation method and application
  • A self-assembled three-dimensional copper Raman-enhanced substrate and its preparation method and application
  • A self-assembled three-dimensional copper Raman-enhanced substrate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Mix 0.1g chitosan with 0.1g citric acid, dissolve in 1% vt glacial acetic acid solution, set the volume to 100mL, transfer to a polytetrafluoroethylene hydrothermal reaction kettle, react at 100°C for 2h, and obtain citric acid Carbon dot 100mL;

[0049] (2) Add 80 mg of sodium hydroxide to 20 mL of 0.1 mol / L copper acetate solution, mix 10 mL of the carbon dot solution obtained, and set the volume to 80 mL to obtain a mixed solution;

[0050] (3) 0.14mL of 35%wt hydrazine hydrate, stirred at 50°C for 2h, centrifuged at 9800rpm for 15min six times after the reaction was completed, and after separation, vacuum-dried at room temperature to obtain copper powder;

[0051] (4) In step (3), the copper powder is ultrasonically oscillated in an aqueous solution to prepare a suspension of 1 mg / mL, quickly put the cleaned glass flakes in the suspension, let it stand for 48 hours, take out the glass flakes, and vacuum Drying to obtain a self-assembled three-dimensional copper...

Embodiment 2

[0053](1) 0.1g chitosan mixed with 0.4g citric acid, dissolved in 1% vt glacial acetic acid solution, fixed to 100mL, transferred to a polytetrafluoroethylene hydrothermal reaction kettle, reacted at 150°C for 12h to obtain citric acid Carbon dot 100mL; its transmission electron microscope picture is as follows figure 1 (c) shown.

[0054] (2) 0.36g of copper acetate, mixed with 80mL of carbon dot solution obtained, added 8g of sodium hydroxide, stirred evenly to obtain a mixed solution;

[0055] (3) 0.28mL of 35%wt hydrazine hydrate, stirred at 80°C for 2h, centrifuged at 9800rpm for 15min six times after the reaction was completed, and after separation, vacuum-dried at room temperature to obtain copper powder;

[0056] (4) In step (3), the copper powder is ultrasonically oscillated in an aqueous solution to prepare a suspension of 5 mg / mL, and the cleaned glass flakes are quickly placed in the suspension, and left to stand for 48 hours, the glass flakes are taken out, and v...

Embodiment 3

[0058] (1) Mix 0.1g of chitosan with 0.5g of citric acid, dissolve in 1% vt glacial acetic acid solution, set the volume to 100mL, transfer to a polytetrafluoroethylene hydrothermal reaction kettle, and react at 200°C for 6h to obtain citric acid Carbon dot 100mL;

[0059] (2) 2mL of 0.1mol / L copper chloride solution, add 20g of sodium hydroxide, mix 2mL of the obtained carbon dot solution, and set the volume to 80mL to obtain a mixed solution;

[0060] (3) 0.056mL of 35%wt hydrazine hydrate, stirred at 80°C for 6h, centrifuged at 9800rpm for 15min six times after the reaction was completed, and after separation, vacuum-dried at room temperature to obtain copper powder;

[0061] (4) In step (3), the copper powder is ultrasonically oscillated in an aqueous solution to prepare a suspension of 10 mg / mL, quickly put the cleaned glass flakes in the suspension, let it stand for 48 hours, take out the glass flakes, and vacuum Drying to obtain a self-assembled three-dimensional coppe...

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Abstract

The invention discloses a self-assembly three-dimensional copper Raman enhanced substrate, and a preparation method and application thereof, and belongs to the field of Raman spectrum analysis. The raw material used by the method is relatively cheap copper; the application cost of an SERS (Surface Enhanced Raman Scattering) substrate is greatly reduced. Carbon points are used for replacing ordinary organic molecules to prepare a copper self assembly structure; the obtained copper substrate does not need special protection; the special treatment is not needed; the direct use can be realized. The prepared self-assembly three-dimensional copper can be stored for a long time in the air. The prepared self-assembly three-dimensional copper has a great number of SERS active sites; the detection limit on probe molecules (4-ATP) is 10<-8> mol / L. The prepared self-assembly three-dimensional copper Raman enhanced substrate has rich hot spots and ultrahigh stability; in addition, in the use process, any pretreatment is not needed; inactivation cannot occur after the placement in the normal temperature air for several months; the large range application of the Raman substrate and the large-range application of the Raman analysis technology are facilitated.

Description

technical field [0001] The invention belongs to the field of Raman spectrum analysis, and relates to the preparation of a Raman-enhanced substrate, in particular to a self-assembled three-dimensional copper Raman-enhanced substrate and its preparation method and application. Background technique [0002] Surface-enhanced Raman scattering (SERS) spectroscopy overcomes the disadvantages of weak signals of ordinary Raman scattering spectroscopy, and has the advantages of simple operation, strong specificity, and short cycle of ordinary Raman spectroscopy. Molecular detection has great potential for development. Experiments have proved that plasmonic metals with nanometer-sized gaps, tips or boundary structures can increase the Raman signal of organic molecules by tens of billions of times, so they are called Raman "hot spot" structures. The key to constructing a highly sensitive and specific surface Raman detection system is to prepare a substrate with a Raman "hot spot" struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65B22F9/24
CPCB22F9/24G01N21/658
Inventor 蒋刚彪曹飘杨刘永林陈文照梁均华黄锨航
Owner SOUTH CHINA AGRI UNIV
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