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Lamellar flower-like nano-silver as well as preparation method and application thereof

A technology of nano-silver and nano-silver particles, which is applied in the field of nano-materials, can solve the problems of surfactant chemical reagent pollution and complexity in the preparation process, and achieve the effects of simple and reliable methods, high particle purity, and mild reaction conditions

Pending Publication Date: 2022-07-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a lamellar flower-like nano-silver particle and its preparation method and application, which solves the problems that the existing method needs to add chemical reagents such as surfactant and etching solution to the solution to cause pollution and the preparation process is complicated.

Method used

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  • Lamellar flower-like nano-silver as well as preparation method and application thereof
  • Lamellar flower-like nano-silver as well as preparation method and application thereof
  • Lamellar flower-like nano-silver as well as preparation method and application thereof

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preparation example Construction

[0038] The invention provides a preparation method of lamellar flower-shaped nano-silver. In a three-electrode system composed of a cathode, an anode and a reference electrode, modified carbon cloth is used as the cathode, platinum wire is used as the anode, and Ag / AgCl is used as the reference electrode. The specific electrode is put into a solution containing silver ions (free or complex), the entire reaction system is at room temperature, and the three electrodes are respectively connected to the corresponding ports of the electrochemical workstation. The silver ions are deposited on the cathode in the form of lamellar flower-like nano-silver particles.

[0039] The cathode in the above device is made of carbon cloth soaked in a PVA aqueous solution with a certain mass concentration. A certain amount of PVA was weighed to prepare a 1-2 wt% PVA aqueous solution, the carbon cloth was immersed in the above solution for 24 hours, taken out and air-dried as a working electrode. ...

Embodiment 1

[0043] The invention discloses a preparation method of lamellar flower-shaped nano-silver, comprising the following processes:

[0044] In a three-electrode system electrochemical reaction device in constant current polarization mode, platinum wire was used as anode, modified carbon cloth after soaking in 1% concentration PVA solution was used as cathode, and Ag / AgCl was used as reference electrode. The current density is 10μA / cm 2 Under the conditions of figure 1 The lamellar flower-like nano-silver with uniform morphology, uniform size and clear lamellar structure is shown, and the thickness of the lamellar layer is about 100 nm. figure 1 The photo in the middle is partially enlarged to clearly show the thickness of the lamellae.

Embodiment 2

[0046] The invention discloses a preparation method of lamellar flower-shaped nano-silver, comprising the following processes:

[0047] In the electrochemical reaction device of the three-electrode system in the constant current polarization mode, the platinum wire was used as the anode, the cathode was the modified carbon cloth soaked in 2% PVA solution, and Ag / AgCl was used as the reference electrode. Density of 10μA / cm 2 Under the conditions of figure 2 The lamellar flower-like nano-silver with uniform morphology, uniform size and clear lamellar structure is shown, and the lamellar thickness is about 300 nm. figure 2 The photo in the middle is partially enlarged to clearly show the thickness of the lamellae.

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Abstract

The invention belongs to the technical field of nano-materials, and particularly relates to a preparation method of lamellar flower-shaped nano-silver particles, which comprises the following steps: by taking PVA (polyvinyl alcohol) modified carbon cloth as a cathode, a platinum wire as an anode and Ag / AgCl as a reference electrode, putting the three electrodes into an aqueous solution containing silver ions, enabling the whole reaction system to be in a room temperature state, and reacting for 2-3 hours; the three electrodes are respectively connected with corresponding ports of an electrochemical workstation, the electrochemical workstation adjusts the cathode current density to be 5-10 [mu] A.cm <-2 > through constant-current electrolysis, silver ions in the solution are deposited on the cathode after reaction, a deposition layer is obtained, and the morphology of the deposition layer is lamellar flower-shaped nano-silver particles. Only the electrode is modified, no chemical reagent such as a surfactant is added into the solution, heavy metal or organic matter pollution is not generated, and the method has the advantages in the aspects of shape controllability and green chemistry. The reaction conditions are mild, the operation is simple and rapid, the prepared particles are high in purity, and expensive equipment or vacuum conditions are not needed.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a lamellar flower-shaped nanometer silver particle and a preparation method and application thereof. Background technique [0002] In recent years, noble metal nanostructures with different morphologies have attracted much attention due to their outstanding antibacterial, catalytic, optical, and magnetic properties. Among these noble metal materials, silver nanostructures with narrow plasmon resonance, superhydrophobic surface, and high cost performance have attracted the attention of many researchers. The researchers synthesized silver nanostructures with various morphologies, such as rods, cubes, filaments, dendrites, polyhedrons, and triangles, by different methods. Manipulating silver nanostructures to systematically study their antibacterial, catalytic, and optoelectronic properties is the most attractive point. Various methods have been developed to synt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/20C25C7/02
CPCC25C1/20C25C7/02
Inventor 王云海赵舶安蔡文芳蒲开波白纪睿高佳瑶
Owner XI AN JIAOTONG UNIV
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