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Preparation method for silver-zinc oxide nano-composite structure

A zinc oxide nanotechnology, composite structure technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve mild reaction conditions, easy large-scale industrial production, and high conversion rate.

Inactive Publication Date: 2014-11-26
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Experiments have shown that zinc oxide nanoparticles are positively charged in weakly alkaline or acidic aqueous solutions, and nano-silver particles are negatively charged in aqueous solutions with a pH value less than 2. A report on the formation of silver-zinc oxide nanocomposite structure through electrostatic assembly of ZnO with certain morphology and nano-silver

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  • Preparation method for silver-zinc oxide nano-composite structure
  • Preparation method for silver-zinc oxide nano-composite structure
  • Preparation method for silver-zinc oxide nano-composite structure

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The preparation of embodiment 1 nano silver sol

[0028] Add 0.5mL concentrated ammonia water (26-28%) into 1L deionized water, stir continuously at a speed of 150-250rpm, adjust the pH value of the solution to 11.5 with 0.5M NaOH aqueous solution, add 0.1mM maltose, 0.01mM silver nitrate , and stirred in the dark for 20 minutes to obtain nano-silver sol.

[0029] figure 1 Shown is the transmission electron microscope (TEM) photo of the nano silver particles obtained in this example. It can be seen from the TEM photo that the obtained nano-silver has a uniform appearance, a spherical shape, a uniform size, and a particle diameter of about 20 nm. The zeta potential of the sample was -35.7mV.

Embodiment 2

[0030] The preparation of embodiment 2 nano-silver sol

[0031] Add 0.5mL concentrated ammonia water (26-28%) into 1L deionized water, stir continuously at a speed of 150-250rpm, adjust the pH value of the solution to 11.3 with 0.5M NaOH aqueous solution, add 0.1mM glucose, 0.01mM silver nitrate , and stirred in the dark for 20 minutes to obtain nano-silver sol.

[0032] figure 2 Shown is the transmission electron microscope (TEM) photo of the nano silver particles obtained in this example. It can be seen from the TEM photographs that the obtained nano-silver has a regular shape, a spherical shape, a uniform size, and a particle size of about 60 nm. The zeta potential of the sample was -34.5mV.

Embodiment 3

[0034] Weigh 1.25g of commercial zinc oxide powder (AR, Sinopharm Group, Shanghai), add it to 500ml of the nano-silver sol prepared in Example 1, ultrasonically disperse for 5 minutes, stir mechanically for 1 hour, centrifuge the product, and wash with absolute ethanol 3 times, vacuum-dried at 60°C for 12 hours to obtain Ag-ZnO nanocomposites, and the loading of silver in the sample was analyzed by plasma emission spectroscopy to be 4.34% (w / w),

[0035] image 3 Shown is a scanning electron microscope (SEM) photo of the commercial zinc oxide powder used in this example. It can be seen from the figure that the powder has an irregular shape and a size between 50 and 200 nm. The zeta potential of the sample was 20.8 mV.

[0036] Figure 4 Shown is the TEM image of the Ag-ZnO nanocomposite obtained in the example. It can be seen from the figure that the silver nanoparticles are uniformly loaded on the surface of the zinc oxide particles.

[0037] Figure 5 Shown is the X-ray ...

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Abstract

The invention discloses a preparation method for a silver-zinc oxide nano-composite structure. The method is simple, efficient and environmentally friendly. The method comprises the steps that the characteristic that electric charges carried by zinc oxide and electric charges carried by nano-silver are opposite is utilized, and nano-zinc oxide powder carrying the positive electric charges is added into nano-silver sol with the negative electric charges in a certain proportion; ultrasonic dispersion or mechanical agitation is performed, so that the nano-zinc oxide powder and the nano-silver sol are fully mixed; on the basis of electrostatic interaction, nano-silver particles are loaded onto the surface of the nano-zinc oxide; afterwards, the obtained solid product is separated through centrifugation or filtration, and the solid product is washed several times with ethyl alcohol and dried to obtain the target product. The preparation method is simple and easy and convenient to implement, the range of the raw materials is wide, neither a surface active agent nor a molecular coupling agent needs to be added, the method is low in energy consumption, free of pollution and environmentally friendly, the product is even in load, the size of loaded silver particles and the amount of load can be regulated and controlled, the interface is clean, and the method is beneficial to accurate regulation and control over the antibacterial activity, photocatalytic properties and surface-enhanced Raman scattering properties of silver-zinc oxide nano-composite structure.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a method for preparing a metal-semiconductor nanocomposite structure, in particular to a method for preparing a silver-zinc oxide nanocomposite structure. Background technique [0002] Metal-semiconductor nanocomposite structures have attracted more and more attention due to their unique optical, electrical, magnetic and catalytic properties. The physical and chemical properties of noble metals and semiconductors are significantly different, and the components in the composite nanostructures formed by them can generate strong mutual coupling effects, which can not only enhance the intrinsic characteristics of semiconductors and noble metal materials, but also exhibit many new properties. . Zinc oxide is an important oxide semiconductor material with wide bandgap and high exciton binding energy. It has broad application prospects in ultraviolet lasers, piezoelectri...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 万家齐陈克正骆华锋张冲宇唐婧暴勇超
Owner QINGDAO UNIV OF SCI & TECH
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