Self-supporting noble metal nanosheet with equal thickness of monatomic layer and preparation method of nanosheet

A single atomic layer, precious metal technology, applied in the field of inorganic functional materials, can solve the problems of unreported synthesis and harsh preparation methods, and achieve the effect of simple process, low cost and good repeatability

Inactive Publication Date: 2013-09-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the tight combination of metal atoms and the substrate, once deposited, they cannot be separated, so research on the intrinsic properties of materials, catalysis, etc. cannot be continued, and the preparation method is harsh.
So far, the synthesis of self-supporting, monoatomically thick noble metal nanosheets has not been reported and remains a challenge

Method used

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  • Self-supporting noble metal nanosheet with equal thickness of monatomic layer and preparation method of nanosheet
  • Self-supporting noble metal nanosheet with equal thickness of monatomic layer and preparation method of nanosheet
  • Self-supporting noble metal nanosheet with equal thickness of monatomic layer and preparation method of nanosheet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step A: Add 6 mg of RhCl 3 ·3H 2 O and 100 mg of polyvinylpyrrolidone with a molecular weight of 20,000-25,000 were added to 5 mL of a mixed solution of methanol and benzaldehyde at a volume ratio of 1:1, and stirred at 30° C. for 60 min;

[0022] Step B: Put the mixed solution prepared in step A into a polytetrafluoroethylene hydrothermal reaction kettle, seal it and keep it at a constant temperature of 150°C for 10 hours, then add 40mL of acetone and leave it for 8 hours, wash it with ethanol for three times, and finally the product is evenly dispersed in ethanol , to obtain self-supporting, monoatomically thick rhodium nanosheets.

[0023] The resulting rhodium nanosheets were subjected to TEM (see figure 1 ), EDX, AFM (see figure 2 ), XAFS (see image 3 ) and other representations. Depend on figure 1 It is confirmed that the synthesized product is a monodisperse nanosheet with a size of (300nm×300nm)-(400nm×400nm)nm. The nanosheets were confirmed to be rhodi...

Embodiment 2

[0026] Step A: Add 6 mg of Pd(acac) 2 and 100 mg of polyvinylpyrrolidone with a molecular weight of 40,000-45,000 were added to 5 mL of a mixed solution of phenethyl alcohol and benzaldehyde at a volume ratio of 5:1, and stirred at 40°C for 60 min;

[0027] Step B: Put the mixed solution prepared in step A into a polytetrafluoroethylene hydrothermal reaction kettle, seal it and keep it at a constant temperature of 180°C for 10 hours, then add 40mL of acetone and leave it for 8 hours, wash it with ethanol for three times, and finally the product is evenly dispersed in dimethyl Self-supporting, monoatomically thick palladium nanosheets were obtained in sulfoxide.

[0028] The self-supporting, monoatomically thick palladium nanosheets prepared above have a size of (300nm×300nm)-(400nm×400nm), a thickness of 0.274nm, and are monodispersed palladium nanosheets with a thickness of a palladium atom; the palladium nanosheets All the atoms of the sheet are surface atoms and are in a s...

Embodiment 3

[0030] Step A: Add 6 mg of NaAuCl 4 2H 2 O and 120 mg of polyvinylpyrrolidone with a molecular weight of 50,000-55,000 were added to 5 mL of a mixed solution of ethanol and isobutyraldehyde at a volume ratio of 1:5, and stirred at 20° C. for 60 min;

[0031] Step B: Put the mixed solution prepared in step A into a polytetrafluoroethylene hydrothermal reaction kettle, seal it and keep it at a constant temperature of 120°C for 10 hours, then add 40mL of acetone and leave it for 8 hours, wash it with ethanol for three times, and finally the product is evenly dispersed in water. Self-supporting, monoatomically thick gold nanosheets were obtained.

[0032] The self-supporting, monoatomically thick gold nanosheets prepared above have a size of (300nm×300nm)-(400nm×400nm), a thickness of 0.288nm, and are monodisperse gold nanosheets with a gold atom thickness; the gold nanosheets All the atoms of the sheet are surface atoms, which are stable in a six-coordination state; the gold na...

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Abstract

The invention discloses a self-supporting noble metal nanosheet with the equal thickness of a monatomic layer and a preparation method of the nanosheet. The self-supporting noble metal nanosheet with the equal thickness of a monatomic layer is prepared by the following steps of: with noble metal salt as a precursor, polyvinylpyrrolidone as a surface active agent and alcohol as a solvent, carrying out adsorption on a special crystal surface of the noble metal by utilizing an aldehyde group of an aldehyde compound, and reducing by utilizing a hydrothermal method to obtain the self-supporting noble metal nanosheet. The utilized reaction precursor is easy to obtain, the technique is simple, the repeatability is good and the cost is low. In a structure for preparing the self-supporting noble metal nanosheet, all noble metal atoms are surface atoms and are stably placed in a hexa-coordinate state, the noble metal nanosheets are uniformly distributed in a polar solvent, and the polyvinylpyrrolidone is adsorbed on the surface of the self-supporting noble metal nanosheets. The self-supporting noble metal nanosheet is of important application prospect in catalysis; and simultaneously, the self-supporting noble metal nanosheet also is an ideal mould material in respect of intrinsic physical property, and can be applied to researching basic physical phenomenon and mechanisms of intrinsic two-dimensioanl metal electronic gas and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, in particular to a preparation method of a self-supporting noble metal nanosheet with a single atomic layer thickness. Background technique [0002] Materials with a monoatomic layer structure have superior properties that are different from other structural materials because all atoms are surface atoms. For example, graphene, which has been booming in recent years, belongs to the single atomic layer structure, which has superior mechanical and electrical properties, and is also an ideal model for studying the basic properties of electricity. In the monoatomic layer structure of noble metals, all metal atoms are surface atoms, which are stable in a six-coordination state and have high activity, so they have important application prospects in catalysis. At the same time, the monoatomic layer structure of noble metals is also an ideal model material in terms of intrinsic phy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 段昊泓李亚栋
Owner TSINGHUA UNIV
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