Hydrangea-shaped gold nanoparticle and preparation method thereof

A technology of gold nanoparticles and hydrangea, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that the flower-like structure does not have a petal-like structure, and achieve common raw materials and preparation The effect of simple and mild conditions and good stability

Active Publication Date: 2014-07-23
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some flower-like gold nanoparticles have been prepared successively, the reported flower-like structures do not have a petal-like structure, and are essentially a type of branch-like gold nanoparticles with abundant branches ([1]. Jena B.K., Raj C.R. , Synthesis of flower-like gold nanoparticles and their electrocatalytic activity towards the oxidation of methanol and the reduction of oxygen, Langmuir, 2007, 23(7), 4064-4070; [2].Xie Jianping, Zhang Qingbo, Lee Jim Yang, Wang Daniel I. C., The Synthesis of SERS-Active Gold Nanoflower Tags for In Vivo Applications, ACS Nano, 2008, 2 (12), 2473-2480, 2008; [3]. Sanda Boca, Dumitrita Rugina, Adela Pintea, Lucian Barbu- Tudoran, Simion Astilean, Flower-shaped gold nanoparticles: synthesis, characterization and their application as SERS-active tags inside living cells, Nanotechnology, 2011, 22 (5), 055702), and how to prepare monodisperse, stable, partial The structure-controlled fabrication of flower-shaped gold nanoparticles with tunable and even customized surface plasmon resonance peaks (LSPRs, such as LSPRs in the near-infrared region for biological detection) remains a major challenge.

Method used

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  • Hydrangea-shaped gold nanoparticle and preparation method thereof
  • Hydrangea-shaped gold nanoparticle and preparation method thereof
  • Hydrangea-shaped gold nanoparticle and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] At different temperatures, the preparation of gold nanoparticles with adjustable hydrangea-like structure adopts the following steps:

[0045] (1) At room temperature, add 1 mL 10 mM HAuCl 4 Add to 10 mL of 200 mM CTAC solution and stir magnetically for 2 min;

[0046] (2) Add 0.5 mL of 0.3 M AA to the mixed colloidal solution prepared in step (1), and magnetically stir for 2 min;

[0047] (3) The mixed solution obtained in step (2) was quickly stored in different system temperature environments (4 ℃, 15 ℃, 20 ℃, 25 ℃), and the latter was grown for 3 hours;

[0048] (4) Step (3) After the reaction is over, anisotropic gold nanoparticles with a hydrangea shape (see 4 ℃ Figure 1a , See at 15 ℃ Figure 1b 、See at 20 ℃ Figure 1c 、See at 25 ℃ Figure 1d ) It is obtained by centrifugal separation and purification, the centrifuge speed is 1500 rpm, and the centrifugation time is 5 min. It was washed three times with ultrapure water, and the finally obtained flower-like gold nanoparti...

Embodiment 2

[0055] At a temperature of 4 ℃, the preparation of gold nanoparticles with adjustable hydrangea-like structure adopts the following steps:

[0056] (1) At room temperature, add 1 mL of 5 mM HAuCl 4 Add to 10 mL of 200 mM CTAC solution and stir magnetically for 2 min;

[0057] (2) Add 0.5 mL of 0.3 M AA to the mixed colloidal solution prepared in step (1), and magnetically stir for 2 min;

[0058] (3) Quickly store the mixed solution obtained in step (2) in a temperature environment of 4 ℃ for 3 h later growth;

[0059] (4) Step (3) After the reaction is over, anisotropic gold nanoparticles with a hydrangea shape (see Figure 2a ) Obtained by centrifugal separation and purification, the centrifuge speed is 2000 rpm, and the centrifugal time is 5 min. The average diameter of the obtained hydrangea-like gold nanoparticles is 550±40 nm, and the petal thickness is 20±2 nm. They are washed three times with ultrapure water, and the finally prepared flower-like gold nanoparticles are disperse...

Embodiment 3

[0062] (1) At room temperature, add 1 mL 20 mM HAuCl 4 Add to 10 mL of 200 mM CTAC solution and stir magnetically for 2 min;

[0063] (2) Add 0.5 mL of 0.3 M AA to the mixed colloidal solution prepared in step (1), and magnetically stir for 2 min;

[0064] (3) The mixed solution obtained in step (2) was quickly stored in a temperature environment of 4 ℃, and the latter was grown for 3 hours;

[0065] (4) Step (3) After the reaction is over, anisotropic gold nanoparticles with a hydrangea shape (see Figure 2b ) It is obtained by centrifugal separation and purification, the centrifuge speed is 1500 rpm, and the centrifugation time is 5 min. The obtained hydrangea-like gold nanoparticles have an average diameter of 800±80 nm, and the petal thickness is 40±7 nm. They are washed three times with ultrapure water, and the finally prepared flower-like gold nanoparticles are dispersed in ultrapure water.

[0066] (5) Take 3 mL of the solution obtained in step (3) as a cuvette with light trans...

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Abstract

The invention discloses a hydrangea-shaped gold nanoparticle and a preparation method of the hydrangea-shaped gold nanoparticle. The method includes the steps that a chloroauric acid solution is added into a surface active agent hexadecyl trimethyl ammonium chloride solution, and magnetic stirring is performed; then an ascorbic acid solution is added, magnetic stirring is performed, growth temperature is adjusted and controlled, standing growth is performed, and the hydrangea-shaped gold nanoparticle is obtained through purification after an obtained solution is centrifuged and washed. The average diameter is 490 nm-812 nm, and the thickness of pedals is 20 nm-44 nm. The prepared gold nanoparticle is of the hydrangea-shaped structure and is high in yield and good in monodispersity and stability, the appearance and the optical property of the particle are controllable and adjustable, and the gold nanoparticle further has the advantages of being simple in synthetic method, mild in synthetic condition, good in stability and the like.

Description

Technical field [0001] The invention belongs to the field of nanomaterials, and specifically relates to a hydrangea-shaped gold nanoparticle and a preparation method thereof. Background technique [0002] In recent years, metal nanoparticles have attracted widespread interest in the fields of biology, medicine, optics, catalysis, and nanoelectronics due to their unique optical, electronic and catalytic properties. Gold nanoparticles will generate plasmons under the excitation of incident light from outside. Surface plasmon is an electromagnetic wave transmission mode formed by the interaction between light and free electrons on the surface of metal or semiconductor material. Electromagnetic waves form extremely high optical localization effects on the surface of nanometers. When the metal nanostructure is excited by the excitation light, a local plasma enhanced field will be formed on the surface. Raman molecules adsorbed on the surface of the metal nanostructure can obtain a si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00B82Y30/00
Inventor 汪联辉宋春元周妮黄维
Owner NANJING UNIV OF POSTS & TELECOMM
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