Method for preparing lattice distortion metal nano material
A lattice distortion, metal nanotechnology, applied in metal material coating process, gaseous chemical plating, coating and other directions, can solve the problems of metal nanomaterials not easy to form, lattice distortion and other problems
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Embodiment 1
[0024] (1) Nanoporous gold (NPG) was prepared by dealloying method.
[0025] 12Ka Au-Ag alloy flakes with a thickness of 100 nm were concentrated HNO in a constant temperature water bath at 30 °C 3 The dealloying treatment was carried out in the solution for 60 minutes to corrode the Ag component therein, and the corroded thin slice was washed three times with ultrapure water, and the obtained material was NPG. figure 1 The low-magnification SEM topography of NPG prepared by the dealloying method, it can be seen that the prepared material is a two-dimensional sheet NPG.
[0026] (2) NPG in step (1) was placed in CH at room temperature 4 In the atmosphere for 30 minutes, the surface of NPG is covered with a layer of amorphous carbon with a thickness of 5nm, and then the temperature is raised to above the melting point of Au (1200°C) at a heating rate of 30°C / min. The amorphous carbon is catalyzed by NPG at 100°C to form graphene. Afterwards, part of the NPG was melted and eva...
Embodiment 2
[0029] (1) Nanoporous gold (NPG) was prepared by electrochemical method.
[0030] First, the Au flakes were degreased in 1 M KOH solution, rinsed with distilled water, and dried in a vacuum oven at 100 °C for 1 h. In this process, the Au sheet was used as the working electrode, and the metal Li foil was used as the auxiliary and reference electrodes. In a non-aqueous mixed solution of ethylene carbonate (EC) and dimethyl carbonate (DMC), the electrolyte is 1M LiPF 6 . The cells were assembled in a glove box filled with Ar gas to isolate water vapor. Discharge treatment was performed at 0.05 mA for 80 hours by a constant current method to form an AuLi alloy. The subsequent charging process was performed at 0.05 mA until the electrode potential reached 3.0 V, Li was removed from the AuLi alloy, and the electrode was taken out and exposed to air for 20 h. Finally, the electrode was immersed in deionized water to remove residual Li. The resulting material is NPG.
[0031] (2...
Embodiment 3
[0033] (1) Nanoporous gold (NPG) was prepared by template method.
[0034] Immerse the prepared porous Cu membrane into KAu(CN) 2 The electrodisplacement reaction was carried out in the aqueous solution, and the generated Au atoms were deposited on the surface of the porous Cu template. After 2 hours of electric displacement reaction, Cu was transformed into Au. Cu atoms diffuse from the porous Cu template into the Au structure to form an Au-Cu alloy. Finally at 0.5M H 2 SO 4And 0.2M NaOH solution, the electrode was subjected to cyclic potential scanning for 8 hours to remove Cu atoms in the alloy. The resulting material is NPG.
[0035] (2) NPG in step (1) was placed in CH at room temperature 4 In the atmosphere for 60 minutes, the surface of NPG is covered with a layer of amorphous carbon with a thickness of 3nm, and then the temperature is raised to above the melting point of Au (1250°C) at a heating rate of 40°C / min. The amorphous carbon is catalyzed by NPG at 300°C t...
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