Carbon-wrapped polyhedron silver nano-particle and controllable self-assembly preparation method thereof

A technology of silver nanoparticles and nanoparticles, which is applied in the field of shape control and self-assembly preparation of noble metal nanoparticles, to achieve uniform size distribution, easy operation, and improved chemical reactivity and thermal stability.

Active Publication Date: 2014-12-03
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, there have been reports on the preparation of organic polymer-coated silver nanowires by one-step hydrothermal method. The organic coating layer can well protect the inner core of silver nanowires from oxidation, but it does not affect the conductivity.

Method used

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  • Carbon-wrapped polyhedron silver nano-particle and controllable self-assembly preparation method thereof
  • Carbon-wrapped polyhedron silver nano-particle and controllable self-assembly preparation method thereof
  • Carbon-wrapped polyhedron silver nano-particle and controllable self-assembly preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Ag / C core-shell composite particles: Dissolve 1.25g of glucose, 0.50g of PVP and 0.028g of silver nitrate in 100ml of deionized water in turn to obtain a reaction mixture solution, and ultrasonically for 20 minutes to completely dissolve the solid and PVP. The concentrations of glucose, PVP and silver nitrate in the solution were 0.07M, 0.04M and 0.25mM, respectively. 40ml of the mixed solution was transferred to a 50ml reaction kettle, and reacted at a constant temperature of 180°C for 6 hours. The reaction kettle was naturally cooled to room temperature, and the product was repeatedly centrifuged and washed, and finally vacuumed or N 2 Dry in an oven at 50±10°C under a protective atmosphere.

[0034]figure 1 (A) is the SEM picture of the product prepared in Example 1, it can be seen that a large number of monodisperse nanoparticles are formed. As can be seen from the high magnification SEM inset, the nanoparticles present a uniform polyhedral morpholo...

Embodiment 2

[0037] The reaction time was changed to 1 hour. Other conditions are with embodiment 1.

Embodiment 3

[0039] The reaction time was changed to 2 hours. Other conditions are with embodiment 1.

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Abstract

The invention discloses a carbon-wrapped polyhedron silver nano-particle and a controllable self-assembly preparation method thereof. A one-step water heating technology is adopted, glucose serves as a reducing agent and a carbon source, and polyvinylpyrrolidone (PVP) serves as a morphological control agent for metallic silver growth and triggers self-assembly of composite particles. The method for preparing the carbon-wrapped polyhedron silver nano-particle comprises the following steps: sequentially dissolving 1.0-2.0g of glucose, 0.25-2.80g of PVP and 0.02-0.04g of silver nitrate in 100ml of deionized water, and ultrasonically dissolving a solid for 20 minutes until the solid is completely dissolved; transferring 40ml of mixed solution into a 50ml reaction kettle, performing constant-temperature reaction for 6 hours at a certain temperature of 160-200 DEG C, and cleaning and drying a product. According to the self-assembly of the composite nano-particles, other conditions are unchanged, the concentration of the PVP is increased to reach a certain value, and the suspension liquid of the cleaned product is directly added to the surface of a carbon film, a silicon chip or other carriers dropwise. The method has a simple process, is low in cost and easy to industrialize, and can be popularized to preparation and industrialized production of other core-shell structure nano-particles and self-assembly structures.

Description

technical field [0001] The invention relates to the preparation method of shape control and self-assembly of noble metal nanoparticles applied in the fields of micro-optical devices, waveguides and biological detection, especially the one-step synthesis of carbon-wrapped polyhedral Ag core-shell nanocomposite particles, or the synchronous realization of this self-assembly of Ag / C composite particles; the self-assembly form can be regulated by adjusting the concentration of surfactant. Background technique [0002] Noble metal nanoparticles have very broad application prospects because they exhibit many optical, electrical, magnetic, catalytic, and sensing properties different from those of bulk materials. These properties strongly depend on the shape and size of the particles, so the shape control of metal nanoparticles has become one of the current research hotspots. Realizing the preparation of noble metal nanoparticles with specific morphology (such as polyhedron) is the...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
Inventor 唐少春李谷骏赵伟博施巍啸林烈雄孟祥康
Owner NANJING UNIV
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