LSPR adjustable gold@silver core-shell nanostar and preparation method thereof

A gold nano and silver nano technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve the problems of difficulty in forming star-shaped nanostructures, limited silver strong diffusivity, etc. Characteristic peaks are prominent and the effect of efficient oxidation

Active Publication Date: 2020-06-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, due to the strong diffusivity of silver, it is difficult to form star-shaped nanostructures

Method used

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  • LSPR adjustable gold@silver core-shell nanostar and preparation method thereof
  • LSPR adjustable gold@silver core-shell nanostar and preparation method thereof
  • LSPR adjustable gold@silver core-shell nanostar and preparation method thereof

Examples

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Embodiment 1-6

[0043] (1) Synthesis of gold nanospheres;

[0044] Measure 90ml of deionized water and add it to the beaker, then inject the aqueous solution of chloroauric acid (1.2ml, 20mmol / L) and trisodium citrate solution (2ml, 38.8mmol / L) into the beaker and stir evenly; (1ml, 0.075wt%, 38.8mmol / L aqueous solution of trisodium citrate as a solvent) was added into the reaction beaker, and stirred continuously for 10 hours at room temperature to obtain a light wine red gold nanosphere solution.

[0045] (2) Synthesis of gold nanostars;

[0046] Measure 6 parts of 0.25ml of 50mmol / L chloroauric acid aqueous solution and inject them into 6 parts of 15ml of DMF respectively to obtain 6 parts of mixed solution, then add 1.5g of PVP-k15 to 6 parts of mixed solution respectively, after 5min , PVP was fully dissolved to obtain 6 parts of clear and transparent liquid.

[0047] Subsequently, 45 μl, 129 μl, 240 μl, 450 μl, 750 μl, and 1050 μl of gold nanosphere solutions were injected into 6 clea...

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Abstract

The invention relates to an LSPR adjustable gold@silver core-shell nanostar and a preparation method thereof. The gold@silver core-shell nanostar comprises a gold nanostar and a silver shell layer coated on the surface of the gold nanostar, wherein the gold nanostar comprises a gold nanosphere positioned at the core and gold nanospines on the surface of the gold nanosphere. Firstly, a liquid-phasechemical method regulated by seeds is adopted, the concentration of the gold nanosphere in a precursor is regulated, and the regulating effect of a surfactant on the growth of a gold nanostructure isutilized, so that the gold nanostar with adjustable size and the LSPR peak between 587-890 nm is prepared; and a polyhydroxy alcohol reduction method is further adopted, ethylene glycol is used as asolvent and a reducing agent, silver nitrate is used as a silver source, the silver shell layer is coated on the surface of the gold nanostar in situ, the surface enhanced Raman scattering (SERS) activity of the nanostar structure is greatly improved, and meanwhile the morphology and the LSPR interval of the core-shell nanostar are maintained. The LSPR adjustable gold@silver core-shell nanostar provides a new choice of materials for a plasmon-driven solar-chemical energy photocatalytic reaction.

Description

technical field [0001] The invention relates to a gold nanostar and a preparation method thereof, in particular to an LSPR-adjustable gold@silver core-shell nanostar and a preparation method thereof. Background technique [0002] When light interacts with noble metal nanoparticles, it will excite the free electrons in the metal particles to generate strong collective oscillation and polarization. When the incident light matches the collective oscillation frequency of electrons, a localized plasmon resonance effect (ie, LSPR Effect), the LSPR effect produces non-equilibrium energetic electron-hole pairs by exciting the electronic transitions in the metal conduction band and between the bands, and diffuses to the surface of the metal-molecule composite system, and the result is that the hot electron-hole pairs participate in the Photocatalytic reactions occur in the redox reactions of adsorbates on metal surfaces. Secondly, the LSPR effect can enhance the local electromagneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00B82Y30/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/054B22F1/17
Inventor 黄竹林孟国文胡小晔陈斌唐海宾霍德贤潘其军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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