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Method for preparing aurum-manganese dioxide nuclear shell structure nano particle

A technology of gold nanoparticles and manganese dioxide is applied in the field of preparation of gold-manganese dioxide core-shell structure nanoparticles, which can solve the problems of excessive thickness of shell layer, loose and porous shell layer, mismatch of crystal lattice between metal and semiconductor, etc. , to achieve the effect of mild synthesis conditions and short reaction time

Inactive Publication Date: 2012-10-03
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is a great challenge to prepare ultrathin and dense metal-semiconductor core-shell nanoparticles due to the lattice mismatch between metal and semiconductor.
Such nanoparticles currently reported in the literature have problems such as excessive shell thickness, loose and porous shell, which seriously limit the application range of metal-semiconductor core-shell structure nanoparticles.

Method used

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  • Method for preparing aurum-manganese dioxide nuclear shell structure nano particle
  • Method for preparing aurum-manganese dioxide nuclear shell structure nano particle
  • Method for preparing aurum-manganese dioxide nuclear shell structure nano particle

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Embodiment 1

[0029] Embodiment 1: Take gold nanoparticles with a size of 55nm and a manganese dioxide shell with a core-shell structure of 1.2nm as an example. Measure 100mL of chloroauric acid solution with a mass fraction of 0.01% and heat it to reflux in a round bottom flask, add 0.7mL of a sodium citrate solution with a mass fraction of 1%, condense and reflux for 30min, and cool to obtain an average particle size of 55nm of gold nanoparticles. Measure 10ml of the above-mentioned gold nanoparticles into a colorimetric tube, add dropwise KOH solution with a concentration of 1M to adjust the pH to 9.5, add 0.07mL of KMnO with a concentration of 10mM 4 solution and 0.35 mL of 10 mM K 2 C 2 o 4 Solution, place the colorimetric tube in a water bath at 60°C for 2 hours to obtain gold-manganese dioxide core-shell nanoparticles with a manganese dioxide shell thickness of 1.2 nm, such as image 3 and Figure 6 shown. Keeping other conditions unchanged, changing the added KMnO 4 solution ...

Embodiment 2

[0032] Embodiment 2: Take the preparation of gold nanoparticles with a size of 20nm and a core-shell structure nanoparticle with a manganese dioxide shell of 2.5nm as an example. Measure 100mL of chloroauric acid solution with a mass fraction of 0.01%, heat it to reflux in a round bottom flask, add 2.5mL of sodium citrate solution with a mass fraction of 1%, condense and reflux for 30min, and get an average particle size of 20nm after cooling of gold nanoparticles. Measure 10ml of the above-mentioned gold nanoparticles into a colorimetric tube, add dropwise KOH solution with a concentration of 1M to adjust the pH to 9.5, add 0.38mL of KMnO with a concentration of 10mM 4 solution and 1.9 mL of 10 mM K 2 C 2 o 4 Solution, place the colorimetric tube in a water bath at 70° C. for 2.5 hours to obtain gold-manganese dioxide core-shell structure nanoparticles with a manganese dioxide shell thickness of 2.5 nm.

Embodiment 3

[0033] Example 3: Preparation of gold nanoparticles with a size of 40nm and a manganese dioxide shell of 10nm with a core-shell structure as an example. Measure 100mL of chloroauric acid solution with a mass fraction of 0.01% and heat it to reflux in a round-bottomed flask, add 1mL of sodium citrate solution with a mass fraction of 1%, condense and reflux for 30min, and obtain gold with an average particle size of 40nm after cooling. Nanoparticles. Measure 10ml of the above gold nanoparticles into a colorimetric tube, add dropwise KOH solution with a concentration of 0.5M to adjust the pH to 9.5, add 0.19mL of KMnO with a concentration of 10mM 4 solution and 0.95 mL of 10 mM K 2 C 2 o 4 Solution, place the colorimetric tube in a water bath at 60° C. for 2 hours to obtain gold-manganese dioxide core-shell structure nanoparticles with a manganese dioxide shell thickness of 2.5 nm.

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Abstract

The invention discloses a method for preparing an aurum-manganese dioxide nuclear shell structure nano particle, which relates to a nano particle. The invention provides a method for preparing an aurum-manganese dioxide nuclear shell structure nano particle. The synthesizing method has the characteristics of simple synthesizing process, short cycle, high yield, and the like. The method comprises the following steps of: preparing an aurum nano particle with the particle diameter of 20-55nm; preparing an aurum nano particle with the particle diameter of 56-200nm; and finally growing an ultrathin and dense manganese dioxide shell layer on the surface of the aurum nano particle to obtain the aurum-manganese dioxide nuclear shell structure nano particle. The invention has wide application prospect in electro-catalysis, Raman spectrometric detection and organic matter and pollutant treatment.

Description

technical field [0001] The invention relates to a nano particle, in particular to a preparation method of a gold-manganese dioxide core-shell nano particle. Background technique [0002] Composite nanoparticles composed of metals and semiconductors have extremely important applications in the fields of photochemistry, electrochemistry, catalysis and biology. Its main form is semiconductor-wrapped metal, that is, metal-semiconductor core-shell structure nanoparticles. The special functions possessed by such composite nanoparticles are caused by the physical and chemical interactions of metals and semiconductors. Since some physical and chemical effects, such as catalytic performance and surface-enhanced activity of Raman spectroscopy, have a distance effect, the shorter the distance, the more obvious the effect. Therefore, the shell thickness of semiconductors plays a key role in the performance of composite nanoparticles. At the same time, the compactness of the shell also...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02B01J13/02
Inventor 林晓东田中群李剑锋周勇亮
Owner XIAMEN UNIV