A LSPR-tunable gold@silver core-shell nanostar and its preparation method

A gold nano, silver nano technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of limited silver diffusion, difficulty in forming star nanostructures, etc., to achieve Significant effect of characteristic peaks

Active Publication Date: 2021-10-08
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • 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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  • A LSPR-tunable gold@silver core-shell nanostar and its preparation method
  • A LSPR-tunable gold@silver core-shell nanostar and its preparation method
  • A LSPR-tunable gold@silver core-shell nanostar and its preparation method

Examples

Experimental program
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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 nano-star and a preparation method thereof. The gold@silver core-shell nanostar includes a gold nanostar and a silver shell covering the surface of the gold nanostar, and the gold nanostar includes a gold nanosphere at the core and a gold nanothorn on its surface. The present invention first adopts the liquid phase chemical method regulated by seeds to regulate the concentration of gold nanospheres in the precursor and utilizes the regulating effect of surfactant on the growth of gold nanostructures to prepare LSPR peaks with adjustable size between 587-890nm Gold nanostars; further adopt the polyhydric alcohol reduction method, use ethylene glycol as the solvent and reducing agent, and silver nitrate as the silver source, coat a layer of silver shell on the surface of the gold nanostars in situ, and greatly improve the quality of the nanostars. The surface-enhanced Raman scattering (SERS) activity of the structure is maintained while maintaining the morphology and LSPR interval of the core-shell nanostar. This LSPR-tunable gold@silver core-shell nanostar provides a new material option for plasmon-driven solar-chemical energy photocatalytic reactions.

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 Patents(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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