A kind of gold/carbon composite microsphere and preparation method thereof

A carbon composite and microsphere technology, applied in the direction of microsphere preparation, microcapsule preparation, etc., can solve the problems such as solvent or surfactant is not easy to wash out, escaped gas and organic matter, and expensive raw materials, etc., to achieve easy direct application, The effect of uniform size distribution and solving the problem of agglomeration

Active Publication Date: 2019-01-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also some problems in the sol-gel method: the raw materials are expensive, and some raw materials are toxic organic substances; the whole process takes a long time, requiring several days or weeks; Many gases and organic matter, and produce shrinkage
However, because the solvent or surfactant is not easy to elute, the post-treatment of this method is troublesome, and high temperature calcination is required.

Method used

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  • A kind of gold/carbon composite microsphere and preparation method thereof
  • A kind of gold/carbon composite microsphere and preparation method thereof
  • A kind of gold/carbon composite microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Stir and mix 0.01M chloroauric acid solution and 0.25M glucose aqueous solution, and slowly add 1.0ml trioctylamine dropwise under stirring condition, and continue stirring for 10 minutes after the dropwise addition;

[0035] Step 2: Ultrasonic dispersion for 15 minutes to form a microemulsion;

[0036] Step 3: React the microemulsion at a constant temperature of 180°C for 12 hours;

[0037] Step 4: After naturally cooling to room temperature, the reaction liquid was alternately and repeatedly centrifuged with water and ethanol, and vacuum-dried at 60°C for 12 hours;

[0038] Step 5: The product is kept at 500° C. for 2 hours under the protection of an inert gas, and annealed to obtain gold / carbon composite microspheres.

[0039] attached figure 2 It is the TEM photo of the morphology characterization diagram of the prepared gold / carbon composite microspheres. It can be seen from the picture that the gold particles are embedded in the carbon spheres, and the...

Embodiment 2

[0041] Step 1: Stir and mix 0.01M chloroauric acid solution and 0.25M glucose aqueous solution, and slowly add 0.75ml trioctylamine dropwise under stirring condition, and continue stirring for 10min after the dropwise addition;

[0042] Step 2: Ultrasonic dispersion for 15 minutes to form a microemulsion;

[0043] Step 3: React the microemulsion at a constant temperature of 160°C for 12 hours;

[0044] Step 4: After naturally cooling to room temperature, the reaction liquid was alternately and repeatedly centrifuged with water and ethanol, and vacuum-dried at 60°C for 12 hours;

[0045] Step 5: The product is kept at 500° C. for 2 hours under the protection of an inert gas, and annealed to obtain gold / carbon composite microspheres.

[0046] attached image 3 In order to characterize the structure of the obtained gold / carbon composite microspheres, the Raman spectrum can clearly see the Raman peak of carbon after fitting, which confirms the existence of carbon.

Embodiment 3

[0048]Step 1: Stir and mix 0.01M chloroauric acid solution and 0.25M glucose aqueous solution, and slowly add 0.5ml trioctylamine dropwise under stirring condition, and continue stirring for 10min after the dropwise addition;

[0049] Step 2: Ultrasonic dispersion for 15 minutes to form a microemulsion;

[0050] Step 3: React the microemulsion at a constant temperature of 180°C for 24 hours;

[0051] Step 4: After naturally cooling to room temperature, the reaction liquid was alternately and repeatedly centrifuged with water and ethanol, and vacuum-dried at 60°C for 12 hours;

[0052] Step 5: The product is kept at 400° C. for 2 hours under the protection of an inert gas, and annealed to obtain gold / carbon composite microspheres.

[0053] attached Figure 4 It is the SEM photo of the morphology characterization diagram of the prepared gold / carbon composite microspheres. It can be seen from the figure that the surface of the carbon spheres is uneven, and the particle size di...

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Abstract

The invention discloses a gold / carbon compound microsphere and a preparation method thereof. The preparation method comprises the following steps: firstly, stirring a glucose solution under a shielding condition; adding a prepared chloroauric acid solution and then slowly adding a defined amount of trioctylamine; putting the mixed solution into an ultrasonic cleaner for ultrasonically scattering, thereby preparing a milk white micro-emulsion; heating the emulsion through hydrothermal reaction; naturally cooling till room temperature; centrifugally separating the reaction liquid; repeatedly cleaning precipitate alternately with water and absolute ethyl alcohol and drying under vacuum; lastly, and annealing the product under Ar protection, thereby acquiring the gold / carbon compound microsphere. The method provided by the invention is simple in operation; the agglomeration problem of nanometer gold particles is solved; the utilization efficiency is increased; the gold / carbon compound microsphere prepared according to the method is uniform in size distribution; the nanometer gold particles are embedded in a carbon shell; the carbon shell thickness and the size of the nanometer gold particles loaded on the carbon shell both are in nano-scale; the dispersity is excellent; the high performance of nanometer gold is fully utilized.

Description

technical field [0001] The invention belongs to the technical field of composite nanomaterials, and in particular relates to a gold / carbon composite microsphere and a preparation method thereof. Background technique [0002] The development of nanotechnology depends largely on the ability to synthesize new nanomaterials with specific structural and functional properties. Since Gleiter H in Germany prepared 6nm iron nanoparticles for the first time in 1984, the research on metal nanoparticles in the world has been vigorously carried out and great results have been achieved. This new nanomaterial has an atomic and electronic structure different from bulk metals with the same chemical composition. With the continuous development of science and technology, metal nanoparticles and their composite materials have shown extremely important application value in metallurgy, chemical industry, light industry, electronics, national defense, nuclear technology, aerospace and other resea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02
CPCB01J13/02
Inventor 江晓红刘姣姜鹏鹏
Owner NANJING UNIV OF SCI & TECH
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