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Three-dimensional "photo frame and photo" structure nano gold material, its synthesis method and application

A synthesis method, nano-gold technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as difficult to obtain discontinuous shell structure with controllable morphology, and achieve good application Effects of foreground, ease of handling, unique optical properties

Active Publication Date: 2017-12-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing core-shell nanomaterials based on gold nanoparticles, such as gold-core-silver-shell nanomaterials, are mostly synthesized by non-covalently adsorbing surfactants on the surface of the crystal nucleus. On the surface of the core, the physically adsorbed surfactant is replaced by competition, and then adsorbed on the surface of the outermost nanoparticle. This continuous growth mode generally produces a continuous shell structure, but it is difficult to obtain a discontinuous shell structure with controllable morphology. shell structure

Method used

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  • Three-dimensional "photo frame and photo" structure nano gold material, its synthesis method and application
  • Three-dimensional "photo frame and photo" structure nano gold material, its synthesis method and application
  • Three-dimensional "photo frame and photo" structure nano gold material, its synthesis method and application

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preparation example Construction

[0032] (1) Preparation of gold nanoparticles with different morphologies

[0033] Gold nanoparticles with different morphologies, such as spherical, rod-shaped, and cubic-shaped, can be used as modified crystal nuclei to prepare photo-frame structured nanoparticles with different morphologies.

[0034] Wherein, gold nanoparticles can be synthesized by any method known in the industry.

[0035] Taking a synthesis process of gold nanorod nuclei as an example, the preparation process of nano gold seeds includes: 10mL of 5×10 -4 M of HAuCl4 solution was added to 10 mL of 0.2 M CTAB solution, and then 1.2 mL of ice-cold NaBH 4 The solution (0.01M) was quickly added to the above mixed solution, and stirred vigorously for 2 min. Stand at room temperature for at least 10 minutes before use. Preparation of gold ion growth solution: 4mL of HAuCl 4 (0.01M) and 0.8mL AgNO 3 Add the solution (0.01M) into 80mL of CTAB solution (0.1M) and mix well, add 0.64mL of ascorbic acid solution (...

Embodiment 1

[0045] (1) Preparation of rod-shaped gold nanoseeds (gold nanorods)

[0046]Preparation of nano-gold seeds: 10 mL of 5 × 10 -4 M of HAuCl4 solution was added to 10 mL of 0.2 M CTAB solution, and then 1.2 mL of ice-cold NaBH 4 The solution (0.01M) was quickly added to the above mixed solution, and stirred vigorously for 2 min. Stand at room temperature for at least 10 minutes before use. Preparation of gold ion growth solution: 4mL of HAuCl 4 (0.01M) and 0.8mLAgNO 3 Add the solution (0.01M) into 80mL of CTAB solution (0.1M) and mix well, add 0.64mL of ascorbic acid solution (0.1M) into the growth solution, stir and mix evenly, add 1.6mL of 1.0M dilute hydrochloric acid solution to adjust the growth The pH of the liquid. Then, 0.02 mL of nano-gold seed solution was quickly added to the growth solution, stirred for 10 s, and left at room temperature for 6 h to prepare gold nanorod particles. Centrifuge at 8000 rpm for 10 min, and redisperse the precipitated gold nanorods in...

Embodiment 2

[0054] (1) Preparation of cubic gold nanoseeds (gold nanocubes)

[0055] Preparation of cubic gold nanoparticles: 0.25mL of 0.01M HAuCl4 solution was added to 7.5mL of 0.1MCTAB solution, and then 0.6mL of ice-cold NaBH4 solution (0.01M) was quickly added to the above mixed solution and stirred vigorously for 2min. Let stand at room temperature for at least 1 hour before use. Preparation of gold ion growth solution: Add 0.8mL of HAuCl4 (0.01M) and 6.4mL of CTAB solution (0.1M) into 32mL of deionized water and mix thoroughly, and add 3.8mL of ascorbic acid solution (0.1M) into the growth solution , stir to mix well. Then 0.02 mL of nano-gold seed solution was quickly added to the growth solution, stirred for 10 s, and left at room temperature for 6 h to obtain cubic gold nanoparticles. Centrifuge at 8000 rpm for 10 min, and redisperse the precipitated gold nanoparticles in deionized water for later use.

[0056] (2) Preparation of gold-silver nanoparticles with core-shell str...

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Abstract

The invention discloses a three-dimensional "photo frame and photo" structure nano-gold material, which includes gold nanoparticles and a discontinuous gold shell layer in a three-dimensional frame structure covering the gold nanoparticles; its synthesis method includes: providing a core Gold and silver nanoparticles with shell structure, including gold nanoparticle crystal core and silver-coated nanoshell layer; after the selected molecules are modified on the surface of gold and silver nanoparticles, they are placed in a selective solvent to make the selected molecules collapse or stretch , thereby forming discontinuous nano-regions on the surface of the gold-silver nanoparticles, and the silver nano-shells in the nano-regions are exposed; the gold-silver nanoparticles are at least reacted with chloroauric acid to form the target product. The invention provides a new type of discontinuous growth mode, which is simple in process and easy to control, and can effectively synthesize three-dimensional "photo frame and photo" structure nanomaterials. This nanomaterial has unique optical properties and is useful in catalysis, sensing and detection, etc. It will have a good application prospect.

Description

technical field [0001] The invention relates to a preparation method of a novel nanomaterial, in particular to a method for synthesizing a nano-gold material with a three-dimensional "photo frame and photo" structure by using a discontinuous regrowth mode and its application, such as application in the field of sensing and detection. Background technique [0002] The unique optical and catalytic properties of gold nanoparticles are closely related to their shape and size. How to precisely control the size and shape of gold nanoparticles is the key to adjust the optical and catalytic properties of gold nanoparticles, which is also a hot spot and difficulty in the research of gold nanomaterials. [0003] In the synthesis process of existing core-shell nanomaterials based on gold nanoparticles, such as gold-core-silver-shell nanomaterials, most of the surfactants are non-covalently bonded to the surface of the crystal nucleus, and when the reduced metal atoms accumulate crystal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00B82Y30/00
Inventor 黄又举陈涛张磊
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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