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Preparation method of polystyrene/gold composite microspheres

A technology of polystyrene microspheres and polystyrene, applied in the field of nano-functional materials, can solve the problems of poor bonding, low coverage, time-consuming and laborious, etc., and achieve the effect of dense coating, ensuring uniformity, and simplifying operation steps

Inactive Publication Date: 2012-10-31
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned traditional preparation methods have their own characteristics, but there are also certain shortcomings.
The layer-by-layer self-assembly method (LbL) can obtain a single-layer or multi-layer polyelectrolyte with high coverage and simple operation, but the intermediate process needs to be repeated, which is time-consuming and laborious
Reference 5 Unmodified polystyrene microsphere surface assembly of gold particles, although the steps are simplified, but it will inevitably affect the uniformity and controllability of the distribution of gold particles on polystyrene microspheres
However, the in situ reduction method has poor binding and low coverage between gold particles and polystyrene microspheres, which greatly affects the morphology, structure and characteristics of polystyrene / gold composite microspheres.

Method used

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  • Preparation method of polystyrene/gold composite microspheres
  • Preparation method of polystyrene/gold composite microspheres
  • Preparation method of polystyrene/gold composite microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a three-necked flask, dissolve 0.0244 g sodium dodecyl sulfate and 0.0222 g potassium persulfate in a mixed solution of ethanol (95%) / water (50ml:20ml), and stir under the protection of argon. Add 1 ml of styrene monomer washed with 10% sodium hydroxide solution dropwise to the solution, heat to 70 °C, and react for 8 h. After the reaction, centrifuge and wash with ethanol for 3 times; use 95% ethanol as a solvent to prepare a 1 mg / ml ethanol solution of polystyrene microspheres. The particle size of the polystyrene microspheres obtained by the reaction is about 300 nm.

[0033]At room temperature, add 0.4 ml of an ethanol solution of 3-aminopropyltriethoxysilane with a volume ratio of 1:49 to 20 ml of a 1 mg / ml polystyrene ethanol solution. Magnetic stirring, reaction 2 h. Aminated polystyrene microspheres were centrifuged and washed with ethanol several times, then dispersed in double distilled water, made into a 1 mg / ml aqueous solution, and allowed to stand for...

Embodiment 2

[0036] Use the 300 nm polystyrene emulsion and the aminated polystyrene aqueous solution in Example 1, let stand for 13 hours, and fully disperse.

[0037] At room temperature, 0.6 ml of 1 wt% chloroauric acid aqueous solution was added dropwise to the aminated polystyrene aqueous solution, heated to boiling with magnetic stirring, and 2.4 ml of 1 wt% trisodium citrate aqueous solution was added to react for 30 min , the reaction system is dark purple. Polystyrene / gold composite microspheres were centrifuged and washed several times with double distilled water. Transmission electron microscopy showed that the product was gold nanoparticles uniformly and densely attached to the surface of polystyrene microspheres, and the average particle size of gold nanoparticles was 8.0±2.0 nm. And the number of gold colloid particles adsorbed on the surface of a single polystyrene microsphere is about 413.

Embodiment 3

[0039] Use the 300 nm polystyrene emulsion and the aminated polystyrene aqueous solution in Example 1, let stand for 22 hours, and fully disperse.

[0040] At room temperature, add 0.2 ml of 1 wt% chloroauric acid aqueous solution dropwise to the aminated polystyrene aqueous solution, stir magnetically and heat up to boiling, add 0.8 ml of 1 wt% trisodium citrate aqueous solution, and react for 30 min , the reaction system is purple. Polystyrene / gold composite microspheres were centrifuged and washed several times with double distilled water. Transmission electron microscopy showed that the product was gold nanoparticles uniformly attached to the surface of polystyrene microspheres, and the average particle size of gold nanoparticles was 6.5±1.8 nm. And the number of gold colloid particles adsorbed on the surface of a single polystyrene microsphere is about 140.

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Abstract

The invention relates to a preparation method of polystyrene / gold composite microspheres, which comprises the following steps: modifying polystyrene microspheres with a silane coupling agent, mixing with a chloroauric acid solution, and heating to carry out ionic selfassembly, wherein gold ions are fixed to the surface of the polystyrene microspheres through gold-nitrogen bonds; and after the solution is boiling, adding trisodium citrate to reduce the gold ions adsorbed onto the amino group in situ, thereby generating the core-shell structure in which a gold nanoparticle is coated on each polystyrene microsphere. The size of the gold particles and the coverage percentage of the gold particles on the polystyrene microspheres are controllable to some extent.

Description

technical field [0001] The invention belongs to the technical field of nanometer functional materials, and in particular relates to a preparation method of polystyrene / gold composite microspheres. Background technique [0002] Composite nanomaterials not only have the characteristics of each component material, but also have new properties, which expand the application range of materials. Among them, polystyrene / gold composite microspheres with core-shell structure have specific and unique morphology, structure and physical and chemical properties, which are expected to be widely used in catalysis, photosensitive devices, temperature sensing, surface-enhanced Raman scattering effect, and immunodetection. Therefore, the research on its preparation, performance and application has always been one of the hot topics of materials scientists. The preparation method of polystyrene / gold composite microspheres directly affects the performance of the composite microspheres, and gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08L25/06C08K3/08
Inventor 周娟任峰张少锋吴伟肖湘衡蒋昌忠
Owner WUHAN UNIV
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