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Micron semisphere composed of silver nano-flakes as well as preparation method and use thereof

A technology of silver nanosheets and microhemispheres, applied in the field of microhemispheres and preparation, can solve the problems of inability to prepare, low sensitivity for detecting trace organics, restricting the detection range, etc., and achieves the effect of scientific preparation method

Inactive Publication Date: 2011-11-09
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter it is the loaded flower-like silver nanostructure material or its synthesis method, there are deficiencies. First, the distance between the nano-sheets that constitute the micro-flower or polyhedral particles is too large, so that the enhancement effect of SERS is not good. , when it is used as a SERS active substrate, not only the sensitivity of detecting trace organic substances is low, but also greatly restricts the detection range, such as rhodamine B, which can only detect one of the organic substances; secondly, the preparation method cannot produce the When it is used as a SERS active substrate, it can also perform rapid trace detection of other organic substances. Micron hemispheres composed of silver nanosheets

Method used

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  • Micron semisphere composed of silver nano-flakes as well as preparation method and use thereof
  • Micron semisphere composed of silver nano-flakes as well as preparation method and use thereof
  • Micron semisphere composed of silver nano-flakes as well as preparation method and use thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The concrete steps of preparation are:

[0027] Step 1, uniformly mix silver nitrate aqueous solution with a concentration of 2g / L and citric acid aqueous solution with a concentration of 8g / L according to the volume ratio of 0.8:1.2 to obtain an electrolyte solution.

[0028] Step 2, put the conductive substrate as the cathode and the graphite sheet as the anode in the electrolyte, and the current density is 0.1mA / cm 2 Electrodeposition under constant current for 180min; wherein, the conductive substrate is conductive glass. made approximately figure 1 as shown in a~f, and as figure 2 The silver nanosheets shown in the curves are composed of micron hemispheres.

Embodiment 2

[0030] The concrete steps of preparation are:

[0031]Step 1, uniformly mix silver nitrate aqueous solution with a concentration of 10 g / L and citric acid aqueous solution with a concentration of 42 g / L according to a volume ratio of 0.9:1.1 to obtain an electrolyte solution.

[0032] Step 2, put the conductive substrate as the cathode and the graphite sheet as the anode in the electrolyte, and the current density is 0.3mA / cm 2 Electrodeposition under constant current for 140min; wherein, the conductive substrate is conductive glass. made approximately figure 1 as shown in a~f, and as figure 2 The silver nanosheets shown in the curves are composed of micron hemispheres.

Embodiment 3

[0034] The concrete steps of preparation are:

[0035] Step 1, uniformly mix silver nitrate aqueous solution with a concentration of 17g / L and citric acid aqueous solution with a concentration of 76g / L according to a volume ratio of 1:1 to obtain an electrolyte solution.

[0036] Step 2, place the conductive substrate as the cathode and the graphite sheet as the anode in the electrolyte, and place it at a current density of 0.5mA / cm 2 Electrodeposition under constant current for 90min; wherein, the conductive substrate is conductive glass. made as figure 1 as shown in a~f, and as figure 2 The silver nanosheets shown in the curves are composed of micron hemispheres.

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Abstract

The invention discloses a micron semisphere composed of silver nano-flakes as well as a preparation method and a use thereof. The micron semisphere with the diameter of 1-30mu m is formed by stacking the silver nano-flakes adhered to a conducting substrate into a sector plate, wherein, the plane of the sector plate is vertical to the center of the semisphere; and the nano-flakes forming the sector plate are of a single crystal structure of silver, the length is 0.5-15mu m, the width is 20nm-1mu m and the thickness is 20-50nm. The preparation method comprises the following steps: firstly evenly mixing a silver nitrate aqueous solution with the concentration of 2-32g / L and a citric acid aqueous solution with the concentration of 8-144g / L based on the volume ratio of (0.8-1.2): (0.8-1.2) to obtain an electrolyte; and taking the conducting substrate as a cathode and a graphite flake as an anode to be placed in the electrolyte, and carrying out electro-deposition under constant current with the density of 0.1-1mA / cm<2> for 10-180 minutes to finally obtain the micron semisphere composed of the silver nano-flakes. The obtained micron semisphere can be utilized as a surface enhanced Ramanscattering (SERS) active substrate so as to measure content of rhodamine or polychlorinated biphenyls (PCBs) or p-methyl benzenethiol adhered thereon by utilizing a confocal Raman spectrometer.

Description

technical field [0001] The invention relates to a micron hemisphere and its preparation method and application, in particular to a micron hemisphere made of silver nanosheets and its preparation method and application. Background technique [0002] Surface-enhanced Raman scattering (SERS) technology can quickly detect trace organic compounds, so this technology has attracted much attention. Since the SERS activity of silver is generally stronger than that of other metals such as gold and copper, silver nanostructures and their preparation methods have attracted much attention. At present, silver nanostructures with various shapes have been prepared as SERS substrates, such as a "loaded flower-shaped silver" disclosed in the Chinese invention patent application publication CN 101323964A published on December 17, 2008. Synthetic methods for nanostructured materials". It uses a high-purity silver sheet as the anode, a platinum film electrode as the cathode, and silver nitrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24C30B29/02C30B29/60
Inventor 朱储红孟国文张倬许巧玲黄竹林
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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