Gold-core silver-shell nanometer composite material and preparation method thereof

A nanocomposite material and composite material technology, which is applied in the field of gold core silver shell nanocomposite material and its preparation, can solve the problems of high biological toxicity of silver nanoparticles, difficult chemical properties, high price of gold nanomaterials, etc. Time, synthesis method, environmental protection and energy saving, and the effect of increasing the scope of application

Inactive Publication Date: 2019-04-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure gold or silver nanomaterials have serious limitations in material diversity, and the price of gold nanomaterials is high, while silver nanomaterials are difficult to control due to their active chemical properties and the surface is easily oxidized or vulcanized to form an insulating layer. Reduced Raman activity and, moreover, higher biotoxicity of silver nanoparticles
In addition, the current gold and silver nanoparticles are generally spherical, and the SERS activity cannot be improved very well.

Method used

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  • Gold-core silver-shell nanometer composite material and preparation method thereof
  • Gold-core silver-shell nanometer composite material and preparation method thereof
  • Gold-core silver-shell nanometer composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In the present invention, all the chemical reagents used are analytically pure or above, without any treatment. Chlorauric acid (HAuCl 4 4H 2 O) and ascorbic acid (L-ascorbic Acid) were purchased from Shanghai Titan Technology Co., Ltd. Cetyl ammonium bromide (CTAB) and cetyl ammonium chloride (CTAC) were purchased from Aladdin Co., Ltd. Hydrochloric acid (HCl, 37%), sodium borohydride (NaBH 4 ), silver nitrate (AgNO 3 ) and trisodium citrate (Na 3 Ct) was purchased from Sinopharm Co., Ltd. The deionized water used in the experiment was prepared in real time by the Millipore-Q ultrapure water system (Millipore, USA), and the conductivity was not lower than 18.2MΩcm -1 .

[0033] (1) Preparation of Au nano-seeds

[0034] First, 0.5 ml of 5 millimole per liter Chlorauric acid solution, 5 ml of 0.1 mol cetyl ammonium chloride per liter and 0.5 ml of 0.1 mol trisodium citrate were mixed and stirred evenly. Thereafter, 0.25 mL of a freshly prepared ice-cold 25 mmol...

Embodiment 2

[0042] Adopt the preparation method similar to embodiment 1, difference is:

[0043] (1) 20 milliliters of CTAC containing 2 micromoles (μmol) chloroauric acid and 40 micromoles of trisodium citrate and 1000 micromoles of CTAC were mixed, and 5 micromoles of sodium borohydride were added while stirring at 25° C. and 400 rpm, Continue to stir to make it evenly mixed, then place it in an oil bath at 70°C for reaction, centrifuge after 4 hours, and cool to room temperature to obtain 2 micromoles of Au seeds;

[0044] (2) A solution of 5 micromoles of chloroauric acid, 1 micromoles of silver nitrate and 200 micromoles of hydrochloric acid was sequentially added to 10 milliliters of 0.1 moles per liter of hexadecyl trimethyl bromide at 25°C and 400 rpm. Ammonium solution, then add 8 micromoles of ascorbic acid, then add 0.02 micromoles of Au seeds prepared in step (1), transfer to a 25°C water bath for reaction, centrifuge after 2.5h, and ultrasonically disperse the precipitate int...

Embodiment 3

[0048] Adopt the preparation method similar to embodiment 1, difference is:

[0049] (1) 20 milliliters containing 5 micromoles of chloroauric acid, 80 micromoles of trisodium citrate and 1000 micromoles of cetyltrimethylammonium chloride solution were stirred while adding 12.5 micromoles at 35°C and 1200rpm. Micromole of sodium borohydride, continue to stir to make it evenly mixed, then place it in an 85°C oil bath for reaction, centrifuge after 1h, and cool to room temperature to obtain 5 micromole of Au seeds;

[0050] (2) A mixed solution containing 30 micromoles of chloroauric acid, 6 micromoles of silver nitrate and 120 micromoles of hydrochloric acid was added to 10 milliliters of hexadecyl at a concentration of 0.1 mole per liter at 35°C and 1200 rpm. Trimethylammonium bromide solution, then add 48 micromoles of ascorbic acid, then add 0.45 micromoles of Au seeds prepared in step (1), transfer to a 35°C water bath for reaction, centrifuge after 1h, and disperse the pre...

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Abstract

The invention relates to a gold-core silver-shell nanometer composite material and preparation thereof. The composite material comprises bi-conical gold nanometer particles and rod-shaped silver nanometer particles wrapped at the external parts of the gold nanometer particles, and the mass ratio of the gold nanometer particles to the silver nanometer particles is (0.8-1):(0.77-3.75). Compared withthe prior art, according to the synthesized Au NBP@Ag NRs shell core nanometer material, the rod-shaped silver nanometer shells are directly grown on the mono-dispersed AU NBPs nanometer material with a tip, it is ensured that the synthesized nanometer composite material has good mono-dispersibility and adjustable diameter-length ratio, and the application range of the nanometer composite material is extended.

Description

technical field [0001] The invention relates to the technical field of Raman detection, in particular to a gold-core-silver-shell nanocomposite material and a preparation method thereof. Background technique [0002] Raman spectrum is the Indian physicist Raman in 1928 when studying the scattering spectrum of benzene and found that in addition to the Rayleigh scattering spectrum with the same frequency as the incident spectrum, there is also a very weak and different frequency from the incident spectrum. Elastic Scattering Spectroscopy. This inelastic scattering spectrum is called Raman scattering. The Raman scattering spectrum of a molecule essentially corresponds to the energy difference between the energy levels of the molecule. Therefore, Raman scattering of molecules can be used to identify the structure of molecules. Raman was also awarded the Nobel Prize in Physics in 1930 for his discovery. Since Raman spectroscopy is not affected by water in the sample, with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/543G01N33/574G01N21/65B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N21/658G01N33/54346G01N33/574
Inventor 崔大祥常杰章阿敏
Owner SHANGHAI JIAO TONG UNIV
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