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A kind of silver cube/flower-like silica core-shell nanomaterial and its preparation method and application

A technology of core-shell nanomaterials and silica, applied in nanotechnology, nanotechnology, material excitation analysis, etc., to achieve good stability and biocompatibility, and strong surface enhancement effects

Active Publication Date: 2021-03-02
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, researchers have paid more attention to the improvement of the surface roughness of noble metal nanomaterials, and little attention has been paid to the influence of surface roughness of other materials on surface-enhanced Raman scattering signals.

Method used

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  • A kind of silver cube/flower-like silica core-shell nanomaterial and its preparation method and application
  • A kind of silver cube/flower-like silica core-shell nanomaterial and its preparation method and application
  • A kind of silver cube/flower-like silica core-shell nanomaterial and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing silver cube / flower-like silica core-shell nanomaterials, comprising the following steps:

[0026] 1. Preparation of silver cube nanoparticles: mix 10 milliliters of silver nitrate aqueous solution (concentration is 5 mmol per milliliter), 10 milliliters of cetyltrimethylammonium bromide aqueous solution (concentration is 50 millimoles per milliliter) and 20 milliliters Glucose aqueous solution (concentration: 1.5 millimoles per milliliter) was mixed and evenly added to the hydrothermal reaction kettle, heated and reacted at 120 degrees Celsius for 8 hours, and the precipitate was collected after centrifugation to obtain silver cubic nanoparticles;

[0027] 2. Preparation of silver cube / flower-like silica core-shell nanomaterials: take step 1) and dissolve the silver cube nanoparticles prepared in 3 ml of water, 1.8 ml of ethanol, 6 mg of hexadecyl trimethyl bromide In the mixed solution composed of ammonium and 30 microliters of ammonia water, aft...

Embodiment 2

[0033] A method for preparing silver cube / flower-like silica core-shell nanomaterials, comprising the following steps:

[0034] 1. Preparation of silver cube nanoparticles: Mix 15 milliliters of silver nitrate aqueous solution (concentration is 5 mmol per milliliter), 15 milliliters of cetyltrimethylammonium bromide aqueous solution (concentration is 50 millimoles per milliliter) and 30 milliliters Glucose aqueous solution (concentration: 1.5 mmol per milliliter) was mixed and stirred evenly, then added to the hydrothermal reaction kettle, heated and reacted at 120 degrees Celsius for 8 hours, and centrifuged to collect the precipitate to obtain silver cubic nanoparticles;

[0035] 2. Preparation of silver cube / flower-like silica core-shell nanomaterials: take step 1) and dissolve the silver cube nanoparticles prepared in 5 ml of water, 3 ml of ethanol, 10 mg of hexadecyl trimethyl bromide In the mixed solution composed of ammonium and 50 microliters of ammonia water, after st...

Embodiment 3

[0041] A method for preparing silver cube / flower-like silica core-shell nanomaterials, comprising the following steps:

[0042] 1. Preparation of silver cube nanoparticles: Mix 20 milliliters of silver nitrate aqueous solution (concentration is 5 mmol per milliliter), 20 milliliters of cetyltrimethylammonium bromide aqueous solution (concentration is 50 millimoles per milliliter) and 40 milliliters Glucose aqueous solution (concentration: 1.5 millimoles per milliliter) was mixed and stirred evenly, then added to the hydrothermal reaction kettle, heated and reacted at 120 degrees Celsius for 8 hours, and centrifuged to collect the precipitate to obtain silver cubic nanoparticles;

[0043] 2. Preparation of silver cube / flower-like silica core-shell nanomaterials: take step 1) and dissolve the silver cube nanoparticles prepared in 10 ml of water, 6 ml of ethanol, 20 mg of cetyltrimethyl bromide In the mixed solution composed of ammonium and 100 microliters of ammonia water, after...

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Abstract

The invention discloses a silver cube / flower-shaped silica core-shell nanomaterial and its preparation method and application. The preparation method comprises mixing and stirring an aqueous solution of silver nitrate, an aqueous solution of cetyltrimethylammonium bromide and an aqueous solution of glucose into a hydrothermal reaction kettle, and after heating and reacting, centrifuging to collect precipitates to obtain silver cubic nanoparticles; Cubic nanoparticles are dissolved in a mixed solution composed of water, ethanol, cetyltrimethylammonium bromide and ammonia water, after stirring, add 4-mercaptophenylacetic acid ethanol solution and polyacrylic acid ethanol solution, and after stirring, add orthosilicic acid Ethyl ester, after 6 hours of reaction, just collect the precipitate after centrifugation. The advantage is that it has good stability and biocompatibility. The mesoporous structure can load more Raman molecules and enhance the surface Raman scattering signal intensity. .

Description

technical field [0001] The invention relates to the fields of material engineering and nanotechnology, in particular to a silver cube / flower-like silica core-shell nanomaterial and its preparation method and application. Background technique [0002] Due to its large electromagnetic enhancement magnification and high spectral intensity, surface-enhanced Raman scattering spectroscopy has been widely used in chemical reaction identification, biomedical imaging, environmental detection, food safety, and immune detection. Studies have shown that the signal enhancement ratio of surface-enhanced Raman scattering can reach up to 10 compared with ordinary Raman scattering. 10 or higher. Such a high enhancement magnification enables detection techniques based on surface-enhanced Raman scattering to obtain extremely low detection limits. At present, there are some controversies about the mechanism explanation of surface-enhanced Raman scattering. The two highly recognized mechanisms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24B82Y30/00B82Y40/00G01N21/65
Inventor 汤晶
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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