Preparing method for gold-silver alloy hollow polyhedron

A technology of gold-silver alloy and polyhedron, which is applied in the field of preparation of gold-silver alloy hollow polyhedron, can solve the problems of thin wall and easy breakage of the hollow structure, and achieve the effect of being strong and broken and not easy to break

Inactive Publication Date: 2018-05-08
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problem that the wall of the hollow structure of the gold-silver alloy nanoparticles prepared by the existing preparation method is relatively thin and is very easy to break, the invention provides a method for preparing a gold-silver alloy hollow polyhedron, which can be made of silver nanocubes A gold-silver alloy hollow polyhedron with uniform distribution of gold and silver elements is prepared as a template, specifically a hollow truncated cube, and the hollow polyhedron has a relatively thick wall, which is strong and not easy to break

Method used

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  • Preparing method for gold-silver alloy hollow polyhedron
  • Preparing method for gold-silver alloy hollow polyhedron

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preparation example Construction

[0026] A method for preparing a gold-silver alloy hollow polyhedron, comprising the steps of:

[0027] Step A: Silver nanocubes are prepared in an oil bath at 150-195° C. by polyalcohol reduction method.

[0028] Step B, dispersing the silver nanocubes into a surfactant solution, thereby obtaining surfactant-dispersed silver nanocubes.

[0029] Step C, adding a reducing agent and surfactant-dispersed chloroauric acid to the surfactant-dispersed silver nanocubes sequentially, reacting for 10 minutes to 2 hours, then performing centrifugation, and then washing the solid obtained after centrifugation, so that A gold-silver alloy hollow polyhedron is obtained.

Embodiment approach

[0031] (1) In step A, the described employing polyol reduction method to prepare silver nanocubes in an oil bath at 150~195°C may include the following steps:

[0032] ① Step A1, using 1,5-pentanediol as a solvent to prepare silver nitrate solutions with a concentration of 10-50 mg / mL (preferably 20 mg / mL) and a concentration of 10-50 mg / mL (preferably 20 mg / mL) ) solution of polyvinylpyrrolidone and a concentration of 10 to 50 mg / mL (preferably 10 mg / mL) of anhydrous cupric chloride solution, and dispersing the anhydrous cupric chloride solution into the silver nitrate solution, thereby An anhydrous copper chloride solution in which silver nitrate is dispersed is obtained.

[0033] ②Step A2, take 2.5~10mL (preferably 5mL) of 1,5-pentanediol in a reaction vessel, and place it in an oil bath at 150~195°C (preferably 175°C), Stir at a rate of 300r / min (preferably 280r / min), make it evenly heated, keep warm for 10-30min (preferably 20min), then add the anhydrous chlorine dispers...

Embodiment 1

[0044] A method for preparing a gold-silver alloy hollow polyhedron, comprising the steps of:

[0045] Step a1, using 1,5-pentanediol as a solvent to configure respectively a silver nitrate solution with a concentration of 20mg / mL, a polyvinylpyrrolidone solution with a concentration of 20mg / mL and an anhydrous copper chloride solution with a concentration of 20mg / mL, and The anhydrous copper chloride solution is dispersed into the silver nitrate solution to obtain an anhydrous copper chloride solution dispersed in silver nitrate.

[0046] Step b1: Take 5mL of 1,5-pentanediol in a single-necked glass bottle, place it in an oil bath at 175°C, stir it at a speed of 280r / min, make it evenly heated, keep it warm for 20min, and then pour it into the Alternately add the silver nitrate-dispersed anhydrous cupric chloride solution and polyvinylpyrrolidone solution in step a1 to the single-necked glass bottle at a rate of 125 uL / min, and the number of additions is 18 times.

[0047] S...

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Abstract

The invention discloses a preparing method for a gold-silver alloy hollow polyhedron. The preparing method comprises the steps that silver nano cubes are prepared in an oil bath at the temperature ranging from 150 DEG C to 195 DEG C through the polyhydric alcohols reducing method; the silver nano cubes are scattered into a surface active agent solution, and accordingly, the silver nano cubes in which a surface active agent is scattered are obtained; a reducing agent and chloroauric acid in which the surface active agent is scattered are sequentially added in the silver nano cubes in which thesurface active agent is scattered, centrifuging separation is conducted after the reaction is conducted for 10 min-2 h, particles obtained after centrifuging separation are washed, and accordingly thegold-silver alloy hollow polyhedron is prepared. The silver nano cubes can serve as a template for preparing of the hollow polyhedron in which gold and silver elements are evenly distributed, and thetemplate feature is not copied; and the wall of the hollow polyhedron is thick, and the hollow polyhedron is firm and not prone to breakage.

Description

technical field [0001] The invention relates to the technical field of preparation of gold-silver alloy nanomaterials, in particular to a method for preparing a gold-silver alloy hollow polyhedron. Background technique [0002] The optical properties of noble metal nanoparticles-localized surface plasmon resonance obviously depend on the size, composition, shape and surrounding environment of the particles, and have potential applications in optoelectronic devices, surface-enhanced spectroscopy and biomedicine. Compared with single-metal nanomaterials, binary metal nanoparticles have unique advantages in optics, catalysis, electronics, etc., so binary metal nanoparticles have attracted more and more attention from researchers. [0003] At present, people can prepare binary metal nanoparticles with core-shell structure or alloy structure by various methods. Since the two precious metals, gold and silver, have a large number of free electrons, when gold and silver are excited...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00B22F1/00
CPCB82Y40/00B22F9/24B22F1/0549B22F1/054
Inventor 郭静刘广强蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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