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Aqueous phase preparation method for single crystal silver nanosphere

A water phase preparation, silver nanotechnology, applied in the field of nanomaterials, can solve the problems of cumbersome steps, high reaction temperature, unfavorable environmental protection, etc., and achieve the effect of safe preparation process, good stability, and environmental protection

Active Publication Date: 2018-11-02
DALIAN NATIONALITIES UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two methods require multi-step centrifugation when transferring the silver nanocubes in the alcohol phase to the water phase, and the strategy of polyol phase synthesis of silver nanocubes requires a reaction temperature as high as 150°C, which is cumbersome and not conducive to environmental protection.

Method used

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  • Aqueous phase preparation method for single crystal silver nanosphere
  • Aqueous phase preparation method for single crystal silver nanosphere
  • Aqueous phase preparation method for single crystal silver nanosphere

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) First, add 5mL of 0.5mM chloroauric acid solution to 5mL of 0.2M cetyltrimethylammonium bromide (CTAB) solution, stir slowly for 2 minutes and quickly add 0.6mL of freshly prepared hydroboration Sodium aqueous solution (10mM), after vigorously stirring for 2 minutes, gold nanoseeds with a size of about 3nm were obtained;

[0033] 2) Add 6mL of 0.5mM chloroauric acid solution to 6mL of 0.2M cetyltrimethylammonium chloride (CTAC) solution, add 4.5mL of 0.1M ascorbic acid after stirring at a slow speed for 2 minutes, and finally Add 150 μL of 3nm gold nanoseeds prepared in step 1), keep stirring for 15 minutes to obtain gold nanoseeds with a size of about 10nm, centrifuge 5.5mL of the gold nanoseed solution twice and disperse them in 1mL of water;

[0034] 3) Add 100 μL of the gold nanoseeds prepared in step 2) to 40 mL of 20 mM CTAC solution, stir in a water bath at 60°C for 15 minutes, then add 100 μL of 0.1 M silver nitrate solution, stir for 15 minutes, then add 1 m...

Embodiment 2

[0039] 1) First, add 5mL of 0.5mM chloroauric acid solution to 5mL of 0.2M cetyltrimethylammonium bromide (CTAB) solution, stir slowly for 2 minutes and quickly add 0.6mL of freshly prepared hydroboration Sodium aqueous solution (10mM), after vigorously stirring for 2 minutes, gold nanoseeds with a size of about 3nm were obtained;

[0040] 2) Add 6mL of 0.5mM chloroauric acid solution to 6mL of 0.2M cetyltrimethylammonium chloride (CTAC) solution, add 4.5mL of 0.1M ascorbic acid after stirring at a slow speed for 2 minutes, and finally Add 150 μL of 3nm gold nanoseeds prepared in step 1), keep stirring for 15 minutes to obtain gold nanoseeds with a size of about 10nm, centrifuge 5.5mL of the gold nanoseed solution twice and disperse them in 1mL of water;

[0041] 3) Add 100 μL of the gold nanoseeds prepared in step 2) to 40 mL of 20 mM CTAC solution, stir in a water bath at 60°C for 15 minutes, then add 100 μL of 0.1 M silver nitrate solution, stir for 15 minutes, then add 1 m...

Embodiment 3

[0046] 1) First, add 5mL of 0.5mM chloroauric acid solution to 5mL of 0.2M cetyltrimethylammonium bromide (CTAB) solution, stir slowly for 2 minutes and quickly add 0.6mL of freshly prepared hydroboration Sodium aqueous solution (10mM), after vigorously stirring for 2 minutes, gold nanoseeds with a size of about 3nm were obtained;

[0047]2) Add 6mL of 0.5mM chloroauric acid solution to 6mL of 0.2M cetyltrimethylammonium chloride (CTAC) solution, add 4.5mL of 0.1M ascorbic acid after stirring at a slow speed for 2 minutes, and finally Add 150 μm of the 3nm gold nanoseeds prepared in step 1), keep stirring for 15 minutes to obtain gold nanoseeds with a size of about 10nm, and 5.5mL of the gold nanoseed solution is centrifuged twice and dispersed in 1mL of water;

[0048] 3) Add 50 μL of the gold nanoseeds prepared in step 2) to 40 mL of 20 mM CTAC solution, stir in a water bath at 60°C for 15 minutes, then add 100 μL of 0.1M silver nitrate solution, stir for 15 minutes, then ad...

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Abstract

The invention relates to an aqueous phase preparation method for a single crystal silver nanosphere, and belongs to the technical field of nano materials. According to the main technical scheme, undera cationic surfactant solution system, firstly, a strong reducing agent is used for reducing 3nm gold nano seeds synthesized by chloroauric acid, then based on the seed-mediated growth method, a lessreductive reducing agent is used for sequentially growing the gold nano seeds to obtain 10nm gold nano seeds and silver nano cubes with different sizes, and finally, a sodium hypochlorite solution isadded to the silver nano cubes as an etching agent to induce the morphological transformation of the silver nano cubes. The prepared silver nano sphere has single crystal morphology, a regular shape,a uniform size and excellent tunable plasma resonance characteristics. The aqueous phase preparation method does not require complicated auxiliary equipment, the cost is low, and popularization is facilitated.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to an aqueous phase preparation method of single crystal silver nanospheres. Background technique [0002] Noble metal nanomaterials have unique and excellent optical properties (localized surface plasmon resonance effect, LSPR), and have been widely used in various fields such as sensing, catalysis, metal-enhanced fluorescence, drug release, and surface-enhanced Raman spectroscopy in recent years. s concern. Since the LSPR properties of metal nanomaterials are closely related to the size and shape of nanomaterials, the regulation of the size and shape of metal nanomaterials is crucial to fully exert their performance. So far, researchers have been able to prepare gold and silver nanostructures in various shapes, including spheres, rods, cubes, octahedrons, triangular sheets, and bipyramids. Among the above shapes, gold-silver nanospheres have perfect shape symmetry an...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00C30B29/02C30B7/14B82Y40/00
CPCC30B7/14C30B29/02B82Y40/00B22F9/24B22F1/054
Inventor 孔祥辉林翔林爽赵海燕刘本康王利
Owner DALIAN NATIONALITIES UNIVERSITY
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