Method for preparing nano porous gold

A nanoporous gold and alloy technology, applied in the field of nanoporous gold preparation, can solve the problems of complex process, high cost, and difficult precise control of Zn-Au alloy composition, and achieve simple operation process, accelerated reaction speed, and suitable for large-scale The effect of industrial production

Inactive Publication Date: 2009-08-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using Ag-Au alloy system to prepare nanoporous gold has a relatively high cost; and Zn-Au surface alloying/dealloying treatment to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example one

[0015] (1) Put the Al-Au alloy into the smelting furnace according to the proportion of 33.4% Au at atomic percentage and the rest being Al. The alloy is heated to a molten state and fully stirred to alloy it. The molten liquid is blown out quickly with argon at a pressure of 0.1MPa, and then chilled on a high-speed rotating copper roller to obtain an alloy ribbon with a thickness of 20-40 microns, a width of 2-5 mm, and a length of 1-5 cm. .

[0016] (2) React with 5% 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, stop heating.

[0017] (3) Collect the reacted products, and rinse them repeatedly with distilled water until the chemical corrosive 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 size and pore wall size are 60-80 nanometers, and the pore structure is evenly distributed....

Example Embodiment

[0018] Example two

[0019] (1) Put the Al-Au alloy into the smelting furnace according to the proportion of 20 atomic percent Au and the rest being Al. The alloy is heated to a molten state and fully stirred to alloy it. The molten liquid is blown out quickly with argon at a pressure of 0.1MPa, and then chilled on a high-speed rotating copper roller to obtain an alloy ribbon with a thickness of 30-50 microns, a width of 2-5 mm, and a length of 5-20 cm. .

[0020] (2) React with 5% 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, stop heating.

[0021] (3) Collect the reacted products, and rinse them repeatedly with distilled water until the chemical corrosive 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 gold has a dual-mode pore distribution.

Example Embodiment

[0022] Example three

[0023] The other steps are the same as in the second embodiment, replacing argon with nitrogen and 5% hydrochloric acid solution with 5% sulfuric acid solution. The nanoporous gold has a dual-mode pore distribution.

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Abstract

The invention belongs to the field of nano-material preparation, in particular to a method for preparing a nano porous gold. In the invention, the nano porous gold is prepared by combining rapid setting and dealloying. The method comprises the following steps: firstly heating pure aluminium and gold to molten state; secondly; rapidly blowing out alloy liquid with inert gases to cause molten liquid metals to rapidly set on a copper roller which rotates at high speed to prepare alloy ribbons; and finally, carrying out dealloying treatment in acid or alkaline solution. After corrosion process, the nano porous gold is washed till neutrality in distilled water. In the method, the nano porous gold can be obtained by selecting corrosion solution with lower concentration, therefore, the nanoporous gold has simple and convenient operating process and is suitable for large-scale industrial production. In the method, the structure and size of the nanoporous gold can be adjusted according to the ingredients and corrosion solution of master alloy.

Description

technical field [0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a preparation method of nanoporous gold. Background technique [0002] Nanoporous metals are materials with nanometer-sized pores, and their pore sizes range from a few nanometers to tens of nanometers. Nanoporous metal is a special kind of porous material. The nanoscale pore size makes it have higher specific surface area and other unique physical, chemical and mechanical properties, such as unique electromagnetic properties, higher chemical activity, higher strength etc. Therefore, nanoporous metals have great application potential, and the current applied research mainly includes catalysis, excitation, sensing, surface-enhanced Raman scattering, etc. [0003] At present, the dealloying method is the main method for preparing nanoporous metals. Most of the selected objects are binary solid solution alloys. By choosing an appropriate corrosion method, the mo...

Claims

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Application Information

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IPC IPC(8): C22C1/08
Inventor 张忠华祁振赵长春
Owner SHANDONG UNIV
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