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Nano-gold material with three-dimensional photo frame and photo structure, synthesis method for nano-gold material and application of nano-gold materia

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 Foreground, simple process, easy to adjust the effect

Active Publication Date: 2016-11-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Nano-gold material with three-dimensional photo frame and photo structure, synthesis method for nano-gold material and application of nano-gold materia
  • Nano-gold material with three-dimensional photo frame and photo structure, synthesis method for nano-gold material and application of nano-gold materia
  • Nano-gold material with three-dimensional photo frame and photo structure, synthesis method for nano-gold material and application of nano-gold materia

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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 nano-gold material with a three-dimensional photo frame and photo structure. The nano-gold material comprises gold nanoparticles and a discontinuous gold shell layer which is of a three-dimensional frame-shaped structure and covers the gold nanoparticles. The synthesis method for the nano-gold material comprises the following steps of: providing gold-silver nanoparticles with core-shell structures, wherein the gold-silver nanoparticles comprise crystal nucleuses of the gold nanoparticles and silver-coated nano shell layers; modifying selected molecules on the surfaces of the gold-silver nanoparticles, and putting the gold-silver nanoparticles into a selective solvent for collapsing or stretching the selected molecules, thereby forming discontinuous nano areas on the surfaces of the gold-silver nanoparticles, and exposing silver nano shell layers in the nano areas; and enabling the gold-silver nanoparticles to at least react with chloroauric acid, thereby forming a target product. The invention provides a novel discontinuous production mode which is simple in process, is easy to operate, and can effectively synthesize the nano material with the three-dimensional photo frame and photo structure; and the nano material has unique optical performances, and has good application prospect in aspect of catalysis, sensing and detecting, and the like.

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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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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