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A Facile Method for Characterizing the Lattice Structure and Purity of Gold Nanocrystals

A technology of lattice structure and gold nanometer, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems that analysis and statistics are not applicable, and achieve low analysis cost, easy operation, Statistical analysis for accurate and objective effects

Active Publication Date: 2021-02-19
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only suitable for the accurate analysis of a single gold nanocrystal, and it is not suitable for the analysis and statistics of a large number of gold nanocrystals.

Method used

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  • A Facile Method for Characterizing the Lattice Structure and Purity of Gold Nanocrystals
  • A Facile Method for Characterizing the Lattice Structure and Purity of Gold Nanocrystals
  • A Facile Method for Characterizing the Lattice Structure and Purity of Gold Nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Disperse gold nanocrystals with a gold content of about 0.25 mM in 10 mL of a CTAC solution with a concentration of 20 mM in a water bath at 60° C. and stir slowly for 15 minutes. Then, 25 μL of 100 mM silver nitrate solution was added to the solution and stirred for 15 minutes. Finally, 250 μL of 100 mM ascorbic acid solution was added, stirred for 4 hours and then cooled to room temperature to obtain gold-silver core-shell nanocrystals.

[0036] (2) Phase transfer of gold-silver core-shell nanocrystals. The gold-silver core-shell nanocrystals were centrifuged for the first time and dispersed in 10 mL, 1 mM CTAC aqueous solution. Then, the nanocrystals were dispersed in 1 mL of 1% polyvinylpyrrolidone (PVP) ethanol solution with a mass fraction of 1% after centrifugation for the second time. Finally, the nanocrystals were centrifuged a third time and dispersed in 1 mL of ethanol.

[0037](3) Assembly of gold-silver core-shell nanocrystals. In a 5 mL plastic cen...

Embodiment 2

[0040] (1) Disperse gold nanocrystals with a gold content of about 0.25 mM in 10 mL of a CTAC solution with a concentration of 50 mM in a water bath at 60° C. and stir slowly for 15 minutes. Then, 25 μL of 100 mM silver nitrate solution was added to the solution and stirred for 15 minutes. Finally, 250 μL of 100 mM ascorbic acid solution was added, stirred for 4 hours and then cooled to room temperature to obtain gold-silver core-shell nanocrystals.

[0041] (2) The gold-silver core-shell nanocrystals were centrifuged for the first time and dispersed in 10 mL, 1 mM CTAC aqueous solution. Then, the gold-silver core-shell nanocrystals were centrifuged for the second time and dispersed in 1 mL of PVP ethanol solution with a mass fraction of 1%. Finally, the gold-silver core-shell nanocrystals were centrifuged for the third time and dispersed in 1 mL of ethanol.

[0042] (3) In a 5 mL plastic centrifuge tube, mix 200 μL of ethanol solution of gold-silver core-shell nanocrystals ...

Embodiment 3

[0045] (1) The preparation method of gold nanorods refers to the literature Nano Lett.2013, 13, 765-771. 10 mL of the reacted gold nanorod solution was centrifuged and dispersed in 20 mL of 20 mM CTAC.

[0046] (2) Take 10 mL of gold nanorod solution, add 25 μL of 100 mM silver nitrate solution into it, and stir for 15 minutes. Finally, 250 μL of 100 mM ascorbic acid solution was added, stirred for 4 hours and then cooled to room temperature to obtain gold-silver core-shell nanocuboids.

[0047] (3) The gold-silver core-shell nanocuboids were centrifuged for the first time and dispersed in 10 mL, 1 mM CTAC aqueous solution. Then, the gold-silver core-shell nanocuboids were centrifuged for the second time and dispersed in 1 mL of 1% PVP ethanol solution. Finally, the gold-silver core-shell nanocuboids were centrifuged for the third time and dispersed in 1 mL of ethanol.

[0048] (4) In a 5 mL plastic centrifuge tube, mix 100 μL of the gold-silver core-shell nanocuboid ethanol...

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Abstract

The invention relates to a convenient method for characterizing the lattice structure and purity of gold nanocrystals, belonging to the technical field of nanometer materials. The main technical scheme is as follows: firstly, under the cationic surfactant solution system, the gold-silver core-shell nanocrystal is prepared by using gold nanocrystal as a seed, adding a silver precursor and a reducing agent. Through the deposition and growth of silver on the surface of gold nanocrystals, the shape is more distinct, which simplifies the analysis of the lattice structure of gold nanocrystals. Then use the liquid-liquid interface self-assembly technology to transfer the gold-silver core-shell nanocrystalline monolayer film to the silicon wafer to obtain the scanning electron microscope characterization sample. This assembly method can ensure that the nanocrystals of different shapes are uniformly, single-layered and densely distributed on the silicon wafer. In addition, the statistics of nanocrystals are more accurate and objective.

Description

technical field [0001] The invention relates to the field of nanometer material analysis, in particular to a convenient method for characterizing the lattice structure and purity of gold nanocrystals. Background technique [0002] Gold nanocrystals have unique optical properties and have recently attracted extensive attention in the fields of catalysis, metal-enhanced fluorescence, solar cells, photothermal therapy, drug delivery, and surface-enhanced Raman spectroscopy. Since the LSPR properties of gold nanocrystals are closely related to their shapes, it is of great significance to prepare gold nanocrystals with different shapes. On the other hand, in order to construct macroscopic nanodevices, the size uniformity, shape regularity and purity of gold nanocrystals are all crucial. So far, researchers have been able to prepare gold nanocrystals in various shapes, including spheres, rods, cubes, triangular plates, and bipyramids. The main factor affecting the shape of gold ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y35/00B82Y40/00G01N23/2251G01N23/2202
CPCG01N23/22G01N23/2202B82Y30/00B82Y35/00B82Y40/00B22F9/24B22F2009/245B22F1/07B22F1/17
Inventor 刘远兰林翔林爽赵海燕刘本康王利
Owner DALIAN NATIONALITIES UNIVERSITY
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