Preparation method for silver nano sheet array by induced growth based on primary cell mechanism and application of SERS (surface-enhanced Raman scattering) effect of silver nano sheet array

A technology of silver nanosheets and primary batteries, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low density of silver nanosheets, cumbersome preparation process, low SERS activity, etc., and achieve Strong surface-enhanced Raman scattering, simple operation, and low-cost effects

Inactive Publication Date: 2012-07-11
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

However, the preparation of the array requires the preparation of a regular array of silica balls in advance, and the entire silver deposition process needs to be realized in a vacuum environment, so the preparation process is cumbersome.
An array of silver nanosheets standing on a conductive substrate can be prepared by electrochemical deposition (Liu, G.; Cai, W.; Liang, C. Cryst. Growth Des. 2008, 8, 2748-2752.), the array It can be used as an effective Raman-enhanced substrate, but a DC power supply must be used in the preparation process, and the density of the prepared silver nanosheets is relatively small, resulting in relatively low SERS activity, which will limit the use of this SERS substrate in the actual trace. applications in quantitative testing

Method used

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  • Preparation method for silver nano sheet array by induced growth based on primary cell mechanism and application of SERS (surface-enhanced Raman scattering) effect of silver nano sheet array
  • Preparation method for silver nano sheet array by induced growth based on primary cell mechanism and application of SERS (surface-enhanced Raman scattering) effect of silver nano sheet array
  • Preparation method for silver nano sheet array by induced growth based on primary cell mechanism and application of SERS (surface-enhanced Raman scattering) effect of silver nano sheet array

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Embodiment 1

[0037] A method for preparing a silver nanosheet array induced by a galvanic cell mechanism, characterized in that:

[0038] Include the following steps:

[0039] A. Pretreatment of the deposition substrate: place the cleaned conductive glass in a gold evaporation equipment, and after steaming gold for 6 s at a current of 5 mA, the pretreated conductive glass is obtained for use;

[0040] B. Use 4g / L silver nitrate aqueous solution and 30g / L citric acid aqueous solution to mix uniformly according to the volume ratio of 1:1 to obtain the deposition solution;

[0041] C. Use the cleaned copper sheet as the negative electrode in the original battery, and the pretreated conductive glass as the positive electrode. After connecting the two electrodes with a wire, place it in the original battery deposition tank. After adding the deposition solution, let it stand at room temperature for 30 ~80 minutes, and then take out the obtained conductive glass with silver nanosheet array, clean ...

Embodiment 2

[0054] 1. The specific operation steps for the preparation of a galvanic cell mechanism-induced growth silver nanosheet array are as follows (for the growth mechanism, see figure 1 ):

[0055] Pretreatment of the deposition substrate: The cleaned conductive glass (3cm×1cm) was placed in the gold evaporation equipment, and gold was evaporated at a current of 5 mA for 6 s before use.

[0056] A 4g / L silver nitrate aqueous solution and an 8-64g / L citric acid aqueous solution are mixed uniformly at a volume ratio of 1:1 to obtain a deposition solution. The cleaned copper sheet (1cm×1cm) is used as the negative electrode in the primary battery, and the pretreated conductive glass is used as the positive electrode. After connecting the two electrodes with wires, place them in the primary battery deposition tank ( figure 2 ), after adding the deposition solution, let it stand at room temperature for 30-80 minutes, then take out the conductive glass with the silver nanosheet array a...

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Abstract

The invention discloses a preparation method for a silver nano sheet array by induced growth based on a primary cell mechanism and an application of the SERS (surface-enhanced Raman scattering) effect of the silver nano sheet array. The silver nano sheet array is prepared on conductive glass subjected to gold steaming by an assembled copper-silver primary cell; and the prepared silver nano sheet array has stronger uniform surface-enhanced Raman scattering effect, namely SERS effect. The nano sheet array is used as an SERS substrate, thus rapid detection and identification of trace tetrachlorobiphenyl, namely PCB-77 are achieved; and the substrate has potential application prospects in the aspect of realizing rapid trace detection on persistent organic pollutants by using the SERS effect.

Description

technical field [0001] The invention relates to the field of depositing silver nanosheet arrays based on the principle of galvanic batteries, in particular to a method for preparing an array of silver nanosheets induced by the galvanic battery mechanism and the application of the SERS effect. Background technique [0002] Silver nanostructures have strong SERS activity and are widely used in the rapid trace detection of organic compounds based on the SERS effect. Silver nanosheets, as a typical silver nanostructure, have attracted widespread attention due to their special optical properties that can induce strong SERS activity. People have prepared silver nanosheets as SERS substrates through various methods. For example, arrays of regularly arranged silver nanosheets can be prepared by nanosphere lithography (Dick, L. A.; McFarland, A. D.; Haynes, C. L.; Van Duyne, R. P. J. Phys. Chem. B 2001, 106, 853-860.), the The array has strong surface-enhanced Raman performance. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/54B82Y30/00B82Y40/00G01N21/65
Inventor 李中波孟国文朱储红张倬梁婷
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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