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A kind of hydrangea-like gold nanoparticles and preparation method thereof

A gold nanoparticle, hydrangea technology, applied in 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 achieves common and good raw materials. Stable, safe and easy to operate

Active Publication Date: 2016-08-17
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 kind 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, LeeJim 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, localized surface plasmon resonance peaks (LSPR) tunable or even customized (such as preparing LSPR in the near-infrared region suitable for biological detection) flower-shaped gold nanoparticles is still a major challenge in the structure-controlled preparation.

Method used

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  • A kind of hydrangea-like gold nanoparticles and preparation method thereof
  • A kind of hydrangea-like gold nanoparticles and preparation method thereof
  • A kind of hydrangea-like gold nanoparticles and preparation method thereof

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Experimental program
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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, dissolve 1 mL of 10 mM HAuCl 4 Add to 10 mL of 200 mM CTAC solution, magnetically stir for 2 min;

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

[0047] (3) Quickly store the mixed solutions obtained in step (2) in different temperature environments (4°C, 15°C, 20°C, 25°C) respectively, and grow for 3 hours later;

[0048] (4) After the reaction in step (3), hydrangea-like anisotropic gold nanoparticles (see Figure 1a 、See at 15℃ Figure 1b 、 See at 20 ℃ Figure 1c 、 See at 25 ℃ Figure 1d ) was separated and purified by a centrifuge at a speed of 1500 rpm and a centrifugation time of 5 min. After washing with ultrapure water three times, the final flower-shaped gold nanoparticles were dispersed in ultrapure water.

[0049]...

Embodiment 2

[0055] At 4 °C, the preparation of gold nanoparticles with tunable hydrangea-like structure was carried out as follows:

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

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

[0058] (3) Quickly store the mixed solution obtained in step (2) at a temperature of 4 °C, and grow for 3 hours in the later stage;

[0059] (4) After the reaction in step (3), the hydrangea-shaped anisotropic gold nanoparticles (see Figure 2a ) was separated and purified by a centrifuge at a speed of 2000 rpm and a centrifugation time of 5 min. The obtained hydrangea-shaped gold nanoparticles have an average diameter of 550±40 nm and a petal thickness of 20±2 nm. They are washed three times with ultrapure water, and the final flower-shaped gold nanoparticles are dispersed in ultrapure water.

[0060] ...

Embodiment 3

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

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

[0064] (3) Quickly store the mixed solutions obtained in step (2) at a temperature of 4 °C respectively, and then grow for 3 hours in the later stage;

[0065] (4) After the reaction in step (3), the hydrangea-shaped anisotropic gold nanoparticles (see Figure 2b ) was separated and purified by a centrifuge at a speed of 1500 rpm and a centrifugation time of 5 min. The obtained hydrangea-like gold nanoparticles have an average diameter of 800±80 nm and a petal thickness of 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) and place it in a four-sided light-transmitti...

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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 nanometer materials, and in particular relates to a hydrangea-shaped gold nanoparticle and a preparation method thereof. Background technique [0002] In recent years, metal nanoparticles have attracted extensive interest in the fields of biology, medicine, optics, catalysis, and nanoelectronics due to their unique optical, electronic, and catalytic properties. Gold nanoparticles generate plasmons when excited by external incident light. Surface plasmon is an electromagnetic wave transmission mode formed by the interaction between light and free electrons on the surface of metal or semiconductor materials. Electromagnetic waves form extremely high optical localization effects on nanometer surfaces. When the metal nanostructure is excited by light, a localized plasmon enhancement field will be formed on the surface, and the Raman molecules adsorbed on the surface of the metal nanostructure can obtain a significantl...

Claims

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Application Information

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Patent Type & Authority Patents(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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