Silver nano / foamed copper material and preparation method and application thereof

A foamed copper and silver nanotechnology, applied in nanotechnology, nanotechnology, analytical materials, etc., can solve the problems that the enhancement effect needs to be further improved, the number of hot spots is not good enough, the nanostructure protection is lacking, etc., and the preparation process is simple, fast and easy to master , extend the storage time limit, improve the effect of sensitivity

Active Publication Date: 2021-08-27
HUAZHONG AGRI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese patent document CN112630151A proposes a silver sol SERS substrate suitable for organophosphorus and carbamate sulfur-containing pesticide molecules, which reduces the lower limit of Raman detection; The number of hotspots is not good enough, and the enhancement effect needs to be further improved
Another example is that the Chinese patent document CN108893714B specifically proposes a SERS substrate densely covered with Ag nano-columnar structures. The number of "hot spots" on the substrate is increased through the nano-columnar structure, and the enhancement effect of the substrate is strengthened; Oxidation or contamination of the molecule to be tested or the detection environment, poor stability, and limited storage time
The above-mentioned public methods all use the substrate made of silver nanomaterials to enhance the surface of Raman spectroscopy, but they are lacking in the protection of nanostructures, and at the same time, the adsorption of molecules to be tested and the number of "hot spots" still need to be further improved. Research

Method used

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  • Silver nano / foamed copper material and preparation method and application thereof
  • Silver nano / foamed copper material and preparation method and application thereof
  • Silver nano / foamed copper material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of silver nano / copper foam material, comprising the following steps:

[0045] (1) Hydrochloric acid immersion of the foamed copper sheet: immerse the cleaned and dried foamed copper sheet with a specification of 0.5cm*0.5cm*0.5mm in 15mL of dilute hydrochloric acid solution with a mass fraction of 3.6%, and soak for 10min;

[0046] (2) Surface removal of foamed copper sheets: use dehydrated alcohol and deionized water to rinse the foamed copper sheets soaked in step (1) successively to remove impurities on the foamed copper sheets surface;

[0047](3) Preparation of mixed solution: fully mix 10 mL of silver nitrate solution with a concentration of 0.1 mol / L and 2 mL of 0.05 g / mL PVP solution to obtain a mixed solution;

[0048] (4) Oscillation reaction: immerse the foamed copper sheet after surface removal of impurities in step (2) in the mixed solution obtained in step (3), and oscillate for 30 s;

[0049] (5) Post-reaction treatment: Rinse the fo...

Embodiment 2～5

[0051] Except that the concentration of the silver nitrate solution is different, the process conditions and preparation process of Examples 2-5 and Example 1 are the same. Wherein, the concentrations of the silver nitrate solution in Examples 2-5 are respectively 0.2mol / L, 0.4mol / L, 0.8mol / L, and 1.6mol / L.

[0052] Figure 1~5 Be respectively the SEM figure of the silver nano / copper foam material that embodiment 1~5 corresponds to prepare, from Figure 1~5 It can be seen in that, with AgNO 3 The higher the concentration, the deposition effect of silver nanoparticles on the surface of copper foam increases first and then decreases.

[0053] Meanwhile, the present invention uses 10- 4 mol / L of 4-ATP is used as a probe molecule to test and analyze the SERS enhancement effect of the silver nano / copper foam substrate prepared in Examples 1 to 5. The test method is as follows:

[0054] (1) Cut the dry and clean silver nano / copper foam material into small pieces of appropriate s...

Embodiment 6

[0060] A preparation method of silver nano / copper foam material, comprising the following steps:

[0061] (1) Hydrochloric acid immersion of the foamed copper sheet: immerse the cleaned and dried foamed copper sheet with a specification of 0.5cm*0.5cm*0.5mm in 15mL of dilute hydrochloric acid solution with a mass fraction of 3.6%, and soak for 10min;

[0062] (2) Surface removal of foamed copper sheets: use dehydrated alcohol and deionized water to rinse the foamed copper sheets soaked in step (1) successively to remove impurities on the foamed copper sheets surface;

[0063] (3) Preparation of mixed solution: fully mix 10 mL of silver nitrate solution with a concentration of 0.8 mol / L and 2 mL of 0.05 g / mL PVP solution to obtain a mixed solution;

[0064] (4) Oscillation reaction: immerse the foamed copper sheet after surface removal of impurities in step (2) in the mixed solution obtained in step (3), and oscillate for 10 s;

[0065] (5) Post-reaction treatment: Rinse the f...

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Abstract

The invention discloses a preparation method of a SERS substrate of a silver nano / foamed copper material. The preparation method comprises the steps of firstly immersing a cleaned and dried small foamed copper sheet with appropriate specifications into a dilute hydrochloric acid solution for a period of time, then rinsing the foamed copper sheet with absolute ethyl alcohol and deionized water in sequence, immersing the treated foamed copper sheet in a mixed solution of a silver nitrate solution and a PVP solution prepared in advance for shaking, rinsing the foamed copper sheet with the absolute ethyl alcohol and the deionized water again, putting the foamed copper sheet into a vacuum drying oven for full drying, and obtaining a silver nano / foamed copper substrate after the drying is completed. The prepared SERS substrate of the silver nano / foamed copper material is cheap in material, simple in preparation method, high in stability, storable, and relatively high in sensitivity in Raman detection.

Description

technical field [0001] The invention belongs to the technical field of surface-enhanced Raman scattering spectroscopy, and in particular relates to a silver nano / copper foam material and a preparation method and application thereof. Background technique [0002] Copper foam is a new multi-functional material with a large number of connected or disconnected pores evenly distributed in the copper matrix. It has good conductivity and ductility, and compared with similar materials such as nickel foam, it has lower preparation cost and better conductivity. , so it is often used to prepare battery negative electrode (carrier) materials, catalyst carriers and electromagnetic shielding materials. [0003] Surface-enhanced Raman spectroscopy (SERS) is a technique that uses the enhanced electric field on the metal surface to increase the intensity of the Raman spectrum by adsorbing molecules to be measured on noble metals. Because of its high sensitivity and rapid detection character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/54B82Y40/00B82Y30/00G01N21/65
CPCC23C18/54B82Y40/00B82Y30/00G01N21/658
Inventor 张德李琛吴卓群余志梁培倪德江
Owner HUAZHONG AGRI UNIV
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