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Preparation method of doped nanoporous gold (NPG) with small pore diameter and large specific surface area

A technology of large specific surface area and nanoporous gold, which is applied in the field of preparation of doped nanoporous gold, can solve the problems of prone to intergranular fracture, poor toughness of porous film, and hinder the practical application of nanoporous gold, so as to achieve easy structure control , low cost, high toughness effect

Inactive Publication Date: 2015-12-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore diameters of the nanoporous gold catalysts reported in the literature are mainly about 20nm to 40nm, but there are few reports on nanoporous gold with a pore diameter not greater than 10nm.
[0004] In addition, nanoporous gold reported in the literature generally has microcracks and surface defects, making the porous film poor in toughness and prone to intergranular fracture, which seriously hinders the use of nanoporous gold as an electrocatalytic material, biosensor, brake, Raman Practical Applications of Reinforcement Materials

Method used

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  • Preparation method of doped nanoporous gold (NPG) with small pore diameter and large specific surface area
  • Preparation method of doped nanoporous gold (NPG) with small pore diameter and large specific surface area
  • Preparation method of doped nanoporous gold (NPG) with small pore diameter and large specific surface area

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Embodiment 1

[0035] In this embodiment, the preparation method of doped nanoporous gold with small pore diameter and large specific surface area includes the following steps:

[0036] Step 1. Clean the gold alloy foil with a thickness of 50 μm, a width of 10 mm, and a length of 30 mm and dry it for use; the gold alloy foil is Au-x binary alloy foil or Au-x-y ternary alloy Foil, the x is Ag, Cu, Al, Ni or Zn, and the y is Pt or Pd; this embodiment is preferably an Au-Ag binary alloy foil (nominal composition is Au-75Ag);

[0037] Step 2, mixing sodium lauryl sulfate and corrosive inorganic acid in a mass ratio of 0.05:100 to obtain a corrosive medium solution; the corrosive inorganic acid is perchloric acid with a concentration of 0.1mol / L;

[0038] Step 3: Put the gold alloy foil dried in step 1 into the corrosive medium solution described in step 2, use the gold alloy foil as the anode and the platinum sheet as the cathode, at a temperature of 40°C and a voltage of Electrochemical corros...

Embodiment 2

[0046] In this embodiment, the preparation method of doped nanoporous gold with small pore diameter and large specific surface area includes the following steps:

[0047] Step 1. Clean the gold alloy foil with a thickness of 90 μm, a width of 10 mm, and a length of 20 mm and dry it for use; the gold alloy foil is Au-x binary alloy foil or Au-x-y ternary alloy Foil material, said x is Ag, Cu, Al, Ni or Zn, said y is Pt or Pd; The gold alloy foil material preferred in this embodiment is Au-Cu binary alloy foil material (nominal composition is Au-75Cu );

[0048] Step 2, mixing sodium dodecylbenzenesulfonate and corrosive inorganic acid in a mass ratio of 0.5:100 to obtain a corrosive medium solution; the corrosive inorganic acid is nitric acid with a concentration of 3mol / L;

[0049] Step 3: Put the gold alloy foil dried in step 1 into the corrosive medium solution described in step 2, use the gold alloy foil as the anode and the platinum sheet as the cathode, at a temperature ...

Embodiment 3

[0057] In this embodiment, the preparation method of doped nanoporous gold with small pore diameter and large specific surface area includes the following steps:

[0058] Step 1. Clean the gold alloy foil with a thickness of 40 μm, a width of 8 mm, and a length of 20 mm and dry it for use; the gold alloy foil is an Au-x binary alloy foil or an Au-x-y ternary alloy Foil, the x is Ag, Cu, Al, Ni or Zn, and the y is Pt or Pd; the preferred gold alloy foil in this embodiment is Au-Al-Pt ternary alloy foil (nominal composition is Au -65Cu-5Pt);

[0059] Step 2, mixing sodium dodecylbenzenesulfonate and corrosive inorganic acid uniformly in a mass ratio of 0.05:100 to obtain a corrosive medium solution; the corrosive inorganic acid is sulfuric acid with a concentration of 10mol / L;

[0060] Step 3. Put the gold alloy foil dried in step 1 into the corrosive medium solution described in step 2, use the gold alloy foil as the anode and the platinum sheet as the cathode, at a temperatur...

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Abstract

The invention provides a preparation method of doped nanoporous gold (NPG) with a small pore diameter and a large specific surface area. The preparation method comprises the following steps: 1, cleaning gold alloy foils thoroughly, and drying for standby application; 2, mixing lauryl sodium sulfate or sodium dodecyl benzene sulfonate (SDBS) with corrosive mineral acid uniformly to obtain a corrosive medium solution; 3, placing the gold alloy foils in the corrosive medium solution for dealloying treatment; 4, boiling, washing and soaking the gold alloy foils subjected to dealloying treatment by adopting absolute ethyl alcohol as a solvent, drying to obtain the doped nanoporous gold (NPG) with a small pore diameter and a large specific surface area. According to the preparation method of the doped nanoporous gold (NPG) with a small pore diameter and a large specific surface area, provided by the invention, nanoporous gold (NPG) with high toughness, a small pore diameter and a large specific surface area is prepared by adopting the surface active agent-induced electrochemical corrosion dealloying technology, therefore the advantages that the process is simple, the cost is quite low, the structure is easy to control and the toughness is higher are achieved.

Description

technical field [0001] The invention belongs to the technical field of porous metal materials for catalysis, and in particular relates to a preparation method of doped nanoporous gold with small pore diameter and large specific surface area. Background technique [0002] Nanoporous gold has attracted much attention as a new type of catalyst. In terms of catalytic oxidation of CO, it has very good catalytic activity at room temperature or even low temperature, selectivity, humidity enhancement effect and excellent resistance to H 2 S poisoning ability. When used in biosensors to detect DNA molecules, it shows high sensitivity. Nanoporous gold is also a recyclable surface-enhanced Raman scattering matrix material with high activity, stability, tunability, and biocompatibility. [0003] With the deepening of research, researchers have increasingly realized that nanoporous structure and morphology have an important impact on catalytic reactions. The smaller the pore size and...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/10B01J35/04
Inventor 李亚宁康新婷李广忠李爱君
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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