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Method for preparing dendritic clusters of silver nanoparticles by cyclic voltammetry

A technology of silver nanoparticles and cyclic voltammetry, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of cumbersome process, large environmental pollution, expensive equipment, etc., and achieve simple process , low cost and simple equipment

Active Publication Date: 2020-04-21
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods for preparing nano-silver can be roughly divided into physical methods, chemical methods and biological methods, but these methods generally have problems such as cumbersome processes, expensive equipment, and large environmental pollution.

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  • Method for preparing dendritic clusters of silver nanoparticles by cyclic voltammetry
  • Method for preparing dendritic clusters of silver nanoparticles by cyclic voltammetry
  • Method for preparing dendritic clusters of silver nanoparticles by cyclic voltammetry

Examples

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Embodiment 1

[0028] Ag 35.5 Zn 64.5 The alloy was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the cyclic voltammetry redox treatment was carried out in 0.5mol / L KOH solution. After applying 100 cycles at a scanning speed of 50 mV / s in the voltage range of -1.5 to 0.9 V, the working electrode was taken out, and after cleaning and drying, an alloy flake loaded with silver nanoparticle dendritic clusters was obtained.

[0029] figure 1 is the electrochemical cyclic voltammetry curve, figure 1 The cyclic voltammetry curves of the first cycle, the 50th cycle and the 100th cycle are given. On the one hand, the curve shows the implementation process of cyclic voltammetry redox; Comparing the electrochemical data after treatment and after 1 cyclic voltammetric redox treatment, it can be clearly seen that the surface area of ​​the material increases significantly after 100 cyclic voltammetric redox treatments.

[0030] The surface morphology of all...

Embodiment 2

[0032] Ag 35.5 Zn 64.5 The alloy was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the cyclic voltammetry redox treatment was carried out in 0.5mol / L KOH solution. After applying 100 cycles at a scanning speed of 25mV / s in the voltage range of -1.5 to 0.9V, the working electrode was taken out, and after cleaning and drying, alloy flakes loaded with silver nanoparticle dendritic clusters were obtained.

[0033] The microstructure of the alloy flakes supported by silver nanoparticle dendritic clusters prepared according to this method is as follows: Figure 4 As shown, a large number of silver nanoparticles with a particle size of about 110nm are attached to the surface of the alloy flakes in the form of dendritic clusters, which have a high specific surface area.

Embodiment 3

[0035] Ag 35.5 Zn 64.5 The alloy was used as the working electrode, the platinum sheet was used as the auxiliary electrode, and the cyclic voltammetry redox treatment was carried out in 0.5mol / L KOH solution. After applying 100 cycles at a scanning speed of 100 mV / s in the voltage range of -1.5 to 0.9 V, the working electrode was taken out, cleaned and dried, and alloy flakes loaded with silver nanoparticle dendritic clusters were obtained.

[0036] The surface morphology of alloy flakes supported by silver nanoparticle dendritic clusters prepared according to this method is as follows: Figure 5 As shown, a large number of silver nanoparticles with a particle size of about 90nm are attached to the surface of the alloy flakes in the form of dendritic clusters, which have a high specific surface area.

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Abstract

The invention discloses a method for preparing a silver nanoparticle branched cluster by using a cyclic voltammetry method. The method comprises the following steps: by taking Ag-Zn alloy thin piecesas a working electrode, a platinum sheet as an auxiliary electrode, and Ag|AgCl|saturated KCl as a reference electrode, carrying out multi-period cyclic voltammetry scanning in a KOH solution; settingthat a scanning electric potential increased to 0.9V from 1.5V and is further reduced to minus 1.5V as one cyclic period, setting a scanning velocity as 10-100mV / s, activating the working electrode in the cyclic process, carrying out continuous repeated oxidation reduction on the working electrode, and finally cleaning and drying after multiple cyclic periods, thereby obtaining an alloy sheet onwhich silver nanoparticle branched clusters about 100nm are supported. The method is simple in process, green and environmentally friendly and simple in equipment.

Description

technical field [0001] The application relates to a method for preparing silver nanoparticle dendritic clusters on the surface of an alloy by cyclic voltammetry, and belongs to the technical field of preparation of nanometer metal functional materials. Background technique [0002] Nano-silver has the macroscopic quantum tunneling effect, quantum size effect, small size effect and surface effect of nanomaterials, and also has excellent electrical conductivity, excellent optical properties, chemical stability and catalytic performance, good biocompatibility and antibacterial properties Wait. At present, it has been widely used in the fields of catalysis, optics, biomedicine, new energy and electronic devices. [0003] At present, the methods for preparing nano-silver can be roughly divided into physical methods, chemical methods and biological methods, but these methods generally have problems such as cumbersome processes, expensive equipment, and large environmental polluti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25F3/02
Inventor 淡振华罗家钰常辉梁永锋
Owner NANJING TECH UNIV