Method for preparing nanometer porous silver

A technology of nanoporous silver and dealloying, which is applied in the field of preparation of nanoporous silver, can solve the problems of complex process, few reports on the preparation of nanoporous silver, and high cost, and achieve cost reduction, suitable for large-scale industrial production, and simple operation process Effect

Inactive Publication Date: 2009-12-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the preparation of nanoporous silver, and they mainly focus on the preparation method of electrochemical metal deposition-dissolution with complex processes. Fa-Long Jia et al. (Jia, F.L.; Yu, C.F.; Deng, K.J.; Zhang, L.Z.J.Phys.Chem.C 2007, 111, 8424.) Deposit a layer of Zn film on the silver electrode using commercial galvanizing solution, and use the formed Ag-Zn alloy thin layer to prepare nano Porous silver thin layer; I-Wen Sun et al. (Yeh, F.H.; Tai, C.C.; Huang, J.F.; Sun, I.W.J.Phys.Chem.B 2006, 110, 5215.) in Taiwan, China also utilizes in ZnCl-EMIC ionic liquid Nanoporous silver films prepared by a similar electrochemical method
Using this Zn-Ag surface alloying / de-alloying treatment to prepare porous silver has high cost and complicated process, and it is difficult to precisely control the composition of Zn-Ag alloy, and often only forms nanoporous particles attached to the surface of dense substrates. thin layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Put the Al-Ag alloy into the melting furnace according to the ratio of 15% Ag by atomic percentage and the rest being Al. The alloy is heated to a molten state, and it is alloyed after sufficient stirring. Use argon to quickly blow out the molten liquid under a pressure of 0.1 MPa, and chill it on a high-speed rotating copper roller to obtain an alloy thin strip with a thickness of 20-40 microns, a width of 2-5 mm, and a length of 1-20 cm .

[0016] (2) React with 5wt.% hydrochloric acid solution at 25° C. for 0.5 hours, then heat to 90° C. for 0.5 hours until no obvious reaction bubbles are generated, and stop heating.

[0017] (3) Collect the reacted product, rinse it repeatedly with distilled water until the chemical corrosion solution is completely cleaned (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and store at 25°C. The pore diameter and pore wall size are about 90-100 nanometers, and the pore structure is evenly di...

Embodiment 2

[0019] (1) Put the Al-Ag alloy into the melting furnace according to the ratio of 35% Ag by atomic percentage and the rest being Al. The alloy is heated to a molten state, and it is alloyed after sufficient stirring. Use argon to quickly blow out the molten liquid under a pressure of 0.1 MPa, and chill it on a high-speed rotating copper roller to obtain an alloy thin strip with a thickness of 30-50 microns, a width of 2-5 mm, and a length of 5-20 cm .

[0020] (2) React with 5wt.% sulfuric acid solution at 25° C. for 1 hour, then heat to 90° C. and react for 1 hour until no obvious reaction bubbles are produced, then stop heating.

[0021] (3) Collect the reacted product, rinse it repeatedly with distilled water until the chemical corrosion solution is completely cleaned (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and store at 25°C. The nanoporous silver has a pore diameter and a pore wall size of about 190-210 nanometers, and the c...

Embodiment 3

[0023] (1) Put the Al-Ag alloy into the melting furnace according to the ratio of 60% Ag by atomic percentage and the rest being Al. The alloy is heated to a molten state, and it is alloyed after sufficient stirring. The molten liquid is quickly blown out with nitrogen gas under a pressure of 0.1 MPa, chilled on a high-speed rotating copper roller, and an alloy thin strip with a thickness of 30-60 microns, a width of 2-5 mm, and a length of 5-30 cm is obtained.

[0024] (2) React with 37wt.% hydrochloric acid solution at 25°C for 1 hour, then heat to 90°C for 2 hours until no obvious reaction bubbles are produced, then stop heating.

[0025] (3) Collect the reacted product, rinse it repeatedly with distilled water until the chemical corrosion solution is completely cleaned (extensive pH test paper checks that the rinsed distilled water is neutral). Then dry and store at 25°C. The hole wall size of the nanoporous silver is about 400-600 nanometers, and the whole nanoporous si...

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Abstract

The invention belongs to the field of preparing a nanometer material, and particularly relates to a method for preparing nanometer porous silver. In the invention, the nanometer porous silver is prepared by the method combining the rapid solidification and the dealloying, wherein the method comprises the following steps: firstly, heating pure metal aluminum and silver to a molten state; secondly, utilizing inert gas to quickly blow out an alloy liquid and quickly solidifying the molten metal on a copper roller rotating at a high speed, so that an alloy ribbon is prepared; thirdly, performing dealloying treatment in acid etchant solution; and finally, after the corrosion, washing the nanometer porous silver to neutral in distilled water. The method uses the etchant solution in low concentration to obtain the nanometer porous silver, the operating process is simple, and the method is also suitable for mass industrialized production. The method can also control the structure and size of the nanometer porous silver according to compositions of the master alloy and types of the etchant solution.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, in particular to a preparation method of nanoporous silver. Background technique [0002] Nanoporous metals are materials with nanometer-sized pores ranging in size from a few nanometers to hundreds of nanometers. At present, the dealloying method is the main method to prepare nanoporous metals with random pore structure. Most of the selected objects are binary solid solution alloys. By choosing an appropriate corrosion method, the more active metals are dissolved, and the remaining relatively inert metal atoms are diffused and recombined to form a bicontinuous nanoporous structure. Among them, there are many reports on porous gold in the field of nanoporous metal preparation. In 2001, Jonah Erlebacher (Erlebacher J, Aziz M, Karma A, et al.Nature, 2001, 410(22): 450-453.) performed Ag-32at.%Au and Ag-24at.%Au with concentrated nitric acid After dealloying, a nanoporous gold film with a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/00B22D11/06C23F1/44
Inventor 张忠华王孝广祁振赵长春
Owner SHANDONG UNIV
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