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A kind of silver nano/copper foam material and its preparation method and application

A foamed copper and silver nanotechnology, applied in analytical materials, nanotechnology, nanotechnology and other directions, can solve problems such as the enhancement effect needs to be further improved, the number of hot spots is not good enough, the protection of nanostructures is not enough, and the preparation process is simple, fast and easy to master. , the effect of prolonging the storage time and improving the sensitivity

Active Publication Date: 2022-06-10
HUAZHONG AGRI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of silver nano/copper foam material and its preparation method and application
  • A kind of silver nano/copper foam material and its preparation method and application
  • A kind of silver nano/copper foam material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0045] (1) Hydrochloric acid soaking of copper foam sheet: The cleaned and dried copper sheet with a specification of 0.5cm* 0.5cm * 0.5mm is immersed in a dilute hydrochloric acid solution with a mass fraction of 3.6% of 15mL, and soaked for 10min;

[0046] (2) The surface of the foam copper sheet is removed: the foam copper sheet after soaking in the step (1) of anhydrous ethanol and deionized water is used sequentially to remove the impurities on the surface of the foam copper sheet;

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

[0048] (4) Shaking reaction: The foam copper sheet after surface impurity removal in step (2) is immersed in the mixture obtained in step (3), and the shaking reaction is 30s;

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

Embodiment 2～5

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

[0052] Figures 1 to 5 Respectively, examples 1 to 5 correspond to the preparation of silver nano / copper foam material SEM diagram, from Figures 1 to 5 As can be seen, along with AgNO 3 The higher the concentration, the deposition effect of silver nanoparticles on the surface of copper foam is first increased and then decreased.

[0053] At the same time, the present invention in 10- 4 mol / L 4-ATP as a probe molecule to obtain the silver nano / copper foam substrate SERS enhancement effect prepared from Example 1 to 5 is tested and analyzed, the test method is as follows:

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

Embodiment 6

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

[0061] (1) Hydrochloric acid soaking of copper foam sheet: The cleaned and dried copper sheet with a specification of 0.5cm* 0.5cm * 0.5mm is immersed in a dilute hydrochloric acid solution with a mass fraction of 3.6% of 15mL, and soaked for 10min;

[0062] (2) The surface of the foam copper sheet is removed: the foam copper sheet after soaking in the step (1) of anhydrous ethanol and deionized water is used sequentially to remove the impurities on the surface of the foam copper sheet;

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

[0064] (4) Shaking reaction: The foam copper sheet after the surface of step (2) is submerged in the mixture obtained in step (3), and the shaking reaction is 10s;

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

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Abstract

The invention discloses a method for preparing a SERS substrate of a silver nanometer / copper foam material. Firstly, immerse the cleaned and dried small pieces of foam copper with appropriate specifications in dilute hydrochloric acid solution for a period of time, and then successively wash them with absolute ethanol, deionized Rinse the foamed copper sheet with water, then immerse the processed foamed copper sheet in the mixed solution of silver nitrate solution and PVP solution prepared in advance to shake, rinse the foamed copper sheet with absolute ethanol and deionized water again, and put it in a vacuum It is fully dried in a drying oven, and the silver nano / copper foam substrate can be obtained after drying. The SERS substrate of the silver nanometer / copper foam material prepared by the invention has the advantages of cheap materials, simple preparation method, strong stability, storage resistance, and high sensitivity in Raman detection.

Description

Technical field [0001] The present invention belongs to the field of surface-enhanced Raman scattering spectroscopy technology, specifically relates to a silver nano / copper foam material and preparation method and application thereof. Background [0002] Copper foam is a new multifunctional material with a large number of connected or non-connecting holes evenly distributed in the copper matrix, which has good conductivity and ductility, and compared with similar materials nickel foam, the preparation cost is lower and the conductivity is better, so it is often used to prepare battery anode (carrier) materials, catalyst carriers and electromagnetic shielding materials. [0003] Surface-enhanced Raman spectroscopy (SERS) is a technique that uses the enhanced electric field of the metal surface to increase the raman spectral intensity by adsorbing the molecule to be measured by a precious metal. Because of its high sensitivity and rapid detection characteristics, it has been wide...

Claims

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Application Information

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Patent Type & Authority Patents(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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