A kind of preparation method of single crystal silver nanosphere aqueous phase

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

Active Publication Date: 2021-07-09
DALIAN NATIONALITIES UNIVERSITY
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  • Abstract
  • Description
  • Claims
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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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  • A kind of preparation method of single crystal silver nanosphere aqueous phase
  • A kind of preparation method of single crystal silver nanosphere aqueous phase
  • A kind of preparation method of single crystal silver nanosphere aqueous phase

Examples

Experimental program
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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 a method for preparing an aqueous phase of single crystal silver nanospheres, which belongs to the technical field of nanometer materials. The main technical scheme is as follows: under the cationic surfactant solution system, first use a strong reducing agent to reduce chloroauric acid to synthesize 3nm gold nano-seeds, and then based on the seed-mediated growth method, use a slightly weaker reducing agent to grow the gold nano-seeds Au nanoseeds of 10 nm and silver nanocubes of different sizes were grown sequentially. Finally, sodium hypochlorite solution was added to the silver nanocubes as an etchant to induce the morphology transformation of the silver nanocubes. The silver nanosphere prepared by the invention has single-crystal morphology, regular shape, uniform size and excellent tunable plasma resonance characteristics. Moreover, the method does not need complex auxiliary equipment, has low cost, and is favorable for popularization.

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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Patent Type & Authority Patents(China)
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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