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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 prepare porous gold, the process is relatively complicated, and the composition of Zn-Au alloy is difficult to accurately control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) According to the ratio of 33.4 atomic percent Au and the rest being Al, put the Al-Au alloy into the melting furnace. 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 0.1MPa, and chill it on a high-speed rotating copper roller to obtain a thin alloy strip 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 hour, then heat to 90° C. and react for 0.5 hour until no obvious reaction bubbles are produced, then 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 60-80 nanometers, and the pore structure is evenly distributed...

Embodiment 2

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

[0020] (2) React with 5% hydrochloric acid solution at 25° C. for 0.5 hour, then heat to 90° C. and react for 0.5 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 gold has a bimodal pore distribution.

Embodiment 3

[0023] Other steps are the same as in Example 2, except that argon is replaced by nitrogen, and 5% hydrochloric acid solution is replaced by 5% sulfuric acid solution. The nanoporous gold has a bimodal 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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