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Silicon dioxide monocaryon bismuth-silver double cap shaped complex nanometer particle and its preparing method

A technology of composite nanoparticles and silicon dioxide, applied in the direction of coating, can solve the problem of easy degradation of silver film, and achieve the effects of low cost, simple operation and good repeatability

Inactive Publication Date: 2008-04-16
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At home and abroad, some people have prepared cap-shaped silver nanoparticles by chemical synthesis combined with physical evaporation technology. However, the silver film evaporated by vacuum thermal evaporation is easy to degrade after being placed indoors for a period of time. Therefore, it is necessary to improve its stability.

Method used

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  • Silicon dioxide monocaryon bismuth-silver double cap shaped complex nanometer particle and its preparing method
  • Silicon dioxide monocaryon bismuth-silver double cap shaped complex nanometer particle and its preparing method
  • Silicon dioxide monocaryon bismuth-silver double cap shaped complex nanometer particle and its preparing method

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Embodiment

[0024] 1) First mix 30mL of absolute ethanol, 5mL of water and 3mL of ammonia water under magnetic stirring, then add 1.7mL of tetraethyl orthosilicate drop by drop, the mixed solution gradually becomes milky white turbid, continue stirring for 10h, then add 20μL of silane coupling agent APTES on SiO 2 Colloids are surface modified. After standing for 12 hours, the mixed solution was washed by centrifugation and redispersed in alcohol several times to remove the remaining reactants.

[0025] 2) Put the 2cm×2cm quartz plate into the “piranha” solution (from the volume ratio of 7:3 H 2 SO 4 and H 2 o 2 composition) for 3 hours, then ultrasonically cleaned with high-purity water and alcohol for 1 hour, and then placed in a constant temperature drying oven at 100 ° C for 1 hour to improve its surface hydrophilicity.

[0026] 3) 2~3 drops of SiO2 2 After the sol is dropped on a clean ordinary glass slide and let it stand for a few seconds, the slide is slowly immersed in a be...

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Abstract

The present invention discloses a silicon dioxide mononuclear bismuth-silver double-cap composite nano-particle and the making method thereof, the silicon dioxide mononuclear bismuth-silver double-cap composite nano-particle is provided with a layer of bismuth thin film on the silicon dioxide nano-particle and one layer of silver thin film is provided on the bismuth thin film; the preparing method comprises the steps of: (1) preparing silicon dioxide nano-particle with St ber method; (2) preparing silicon dioxide nano-particle single layer array on the surface of the piezoid with the self-assembling technique; (3) successively depositing the bismuth thin film and silver thin film on the surface of the piezoid which is covered with silicon dioxide nano-particle with heat evaporation method. The obtained composite nano-particle has excellent chemical stability and the absorption spectrum chart after depositing for one year is nearly unchanged. The preparing method has the advantages of easy operating, low cost, good repeatability, easy controlling of the nuclear diameter and cap thickness.

Description

technical field [0001] The invention relates to a silicon dioxide mononuclear bismuth-silver double-capped composite nanoparticle and a preparation method thereof. Background technique [0002] Compared with bulk materials, noble metal silver nanoparticles have many unique physical and chemical properties, among which surface plasmon resonance (SPR) characteristics are one of the hotspots of research, and SPR is closely related to factors such as particle size, shape and environment. Based on the surface plasmon resonance response, silver nanoparticles have been widely used in optical components, chemical biosensors, surface-enhanced fluorescence spectroscopy, and surface-enhanced Raman spectroscopy. At present, the preparation methods of silver nanoparticles mainly include chemical reduction method, electrode method, deposition method and physical evaporation method. The structures for preparing nano-silver include colloids (particles, wires, triangles, discs, etc.), elect...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 满石清肖桂娜
Owner JINAN UNIVERSITY
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