Discrete precious metal nanoparticles and preparing method thereof

A nanoparticle and precious metal technology, applied in metal processing equipment, nanotechnology, nanotechnology, etc., can solve problems such as cumbersome operation and difficult interface control

Active Publication Date: 2016-12-21
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its operation is cumbersome and interface regulation is difficult (Adv. Funct. Mater., 2015, 25, 5816-5822)

Method used

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  • Discrete precious metal nanoparticles and preparing method thereof
  • Discrete precious metal nanoparticles and preparing method thereof
  • Discrete precious metal nanoparticles and preparing method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0062] In the preparation examples, examples, comparative examples and detection process of the present invention, the reagents used are as follows: tetrachloroauric acid (HAuCl 4 ) and silver nitrate (AgNO 3 ) was purchased from Sinopharm Chemical Reagent Co., Ltd.; sodium borohydride, cetyltrimethylammonium bromide, ascorbic acid, L-cysteine ​​(L-CYS), D-cysteine ​​(D-CYS) Available from Alfa Aesar.

[0063] Circular dichroism spectra were measured at room temperature on a JASCO J-810 circular dichroism spectrometer.

[0064] Transmission electron microscopy images were obtained on a Tecnai G2 20 S-TWIN TEM transmission electron microscope (accelerating voltage is 200KV).

preparation example 1

[0066] The preparation of the precious metal material in the method step (A) of the present invention is a prior art, and those skilled in the art can refer to the methods disclosed in the prior art for preparation. For example, the preparation of noble metal gold nanorods can be prepared by the seed modulation growth method familiar to those skilled in the art:

[0067] For example, the gold nanorod growth solution is mixed with the gold seed crystal, and the mixed mixture is placed under the condition of gold seed crystal growth to grow the gold seed crystal, and the gold nanorod growth solution contains surfactant, reducing agent, tetrachloromethane Auric acid and soluble silver salts. The surfactant, reducing agent and soluble silver salt can be selected from commonly used reagents in the field. Preferably, the surfactant is cetyltrimethylammonium bromide, the reducing agent is ascorbic acid, and the soluble silver salt is silver nitrate.

[0068] More specifically, the f...

Embodiment 1

[0076] This example is used to illustrate the preparation process of gold nanorods modified by chiral small molecule L-CYS, adding a regrowth solution to obtain discrete gold nanoparticles with strong PCD signal (preparation of discrete gold nanoparticles The schematic diagram is shown in Figure 6).

[0077] (A) To 1 mL of the 0.1 nM gold nanorod dispersion solution prepared and purified in Preparation Example 1 (containing about 0.1 mM gold atomic concentration), add 100 μL of CTAB aqueous solution with a concentration of 0.1 M, and add 2 μL of 10 mM L-CYS solution, To obtain a mixed solution, the concentration of CTAB in the mixed solution is 10 mM, the concentration of L-CYS in the mixed solution is 20 μM, and the concentration of gold nanorods in the mixed solution is 0.1 nM, and then stand for adsorption in a constant temperature water bath at 30 ° C for 1 h;

[0078] (B) Then add the regrowth solution successively to the above solution obtained in step (A): AgNO 3 (10mM...

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Abstract

The invention relates to discrete precious metal nanoparticles with high plasmon circular dichroism response and a preparing method of the nanoparticles. The method comprises following steps: precious metal materials with anisotropy are adopted, chirality micromolecules are modified on the materials, a reducing agent and a precious metal saline solution are added into a solution of the obtained precious metal materials modified with the chirality micromolecules, standing is carried out for the reaction, a precious metal layer grows on the surface of the heavy metal materials modified with the chirality micromolecules, and the discrete precious metal nanoparticles with high plasmon circular dichroism response are obtained. The preparing method of the discrete precious metal nanoparticles is simple, gentle in reaction condition and easy and convenient to operate; the obtained discrete precious metal nanoparticles are very good in dispersion, for a single nanoparticle, a higher PCD signal is obtained, and the method is very suitable for detection, fundamental research(surface chemistry and PCD mechanism study) and the like.

Description

technical field [0001] The invention belongs to the field of nanoparticle preparation, and relates to a discrete noble metal nanoparticle and a preparation method thereof, in particular to a discrete noble metal nanoparticle with strong plasmonic circular dichroic response and a preparation method thereof. Background technique [0002] Due to the lack of symmetry plane and symmetry center, the substance cannot completely coincide with its enantiomer, so it has chirality. Chirality is a very common phenomenon in nature. Molecules as small as a few Angstroms (such as amino acids, sugars), as large as macroscopic organisms (such as vines, shellfish), all have chirality. Chiral substances absorb differently for left-handed and right-handed polarized light, and the difference between them is called circular dichroism (CD). However, the CD signals of general biomolecules are mostly located in the ultraviolet region, and the signals are very weak, which brings certain difficultie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0551B22F1/0553B22F1/0547B22F1/17
Inventor 颜姣侯帅吴晓春
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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