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Method for preparing nano material layer by self-assembling diphenylacetylene on surface of metal single crystal

A technology of diphenylacetylene and nanomaterials, applied in the field of nanomaterials, can solve the problem of inability to prepare two-dimensional porous nanomaterials, and achieve the effect of orderly structure and uniform size of pores

Active Publication Date: 2021-07-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the prior art cannot prepare two-dimensional porous nanomaterials in an ultra-high vacuum cavity using tolanylacetylene as a precursor molecule, and to provide a method based on the self-assembly of tolanylacetylene molecules on the surface of metal single crystals. A method for two-dimensional porous nanomaterials

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  • Method for preparing nano material layer by self-assembling diphenylacetylene on surface of metal single crystal
  • Method for preparing nano material layer by self-assembling diphenylacetylene on surface of metal single crystal
  • Method for preparing nano material layer by self-assembling diphenylacetylene on surface of metal single crystal

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Embodiment 1

[0017] Example 1: In this embodiment, the method for preparing a two-dimensional porous nanomaterial on the surface of a metal single crystal based on the self-assembly of tolanylene molecules is carried out according to the following steps:

[0018] 1. Place the Au(111) single crystal substrate in the ultra-high vacuum preparation chamber of a low-temperature scanning tunneling microscope (LT-STM UNISOKU SPM1200), and the vacuum degree in the chamber is 3.0×10 -10 torr, the temperature is room temperature. At an argon pressure of 1.0 x 10 - 5 Under mbar, there is a discharge electrode in the preparation chamber. The discharge electrode is controlled by the argon chamber controller (PREVAC IS40-PS), and the discharge electrode connected to the vacuum chamber is applied to the voltage by the argon chamber controller (PREVAC IS40-PS). , current, under the condition that the high voltage is 1KeV and the current is 26mA, argon ion sputtering is performed on the surface of Au(111...

Embodiment 2

[0024] Example 2: This implementation mode is different from Example 1 in that: the metal single crystal described in step 2 is heated to 53° C., and the deposition time is 3 s. Other steps and parameters are the same as in Example 1. The nanomaterials have a pore size of 3.39nm, an average height of 120pm, and are uniformly arranged. Diphenylacetylene first forms a disordered monomolecular layer on the surface of the metal single crystal, and then forms a ring-shaped protruding two-dimensional hole-like nanomaterial region on the surface of the first layer. The second layer is composed of The ring area formed by the self-assembly of tolanne molecules through hydrogen bond interaction, the middle of the ring area is the hole that exposes the first layer, and the hole surrounded by the assembled molecules and the assembled molecules (ie the second layer) are on the surface of the first layer The coverage rate is 18%.

Embodiment 3

[0025] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the deposition time in step 2 is 3s. The nanomaterials have a pore size of 3.39nm, an average thickness of 0.95nm, an average height of 120pm, and are uniformly arranged. Diphenylacetylene first forms a disordered monomolecular layer on the surface of the metal single crystal, and then forms a ring-shaped protruding two-dimensional hole-like nanomaterial region on the surface of the first layer. The second layer is composed of The ring area formed by the self-assembly of tolanne molecules through hydrogen bond interaction, the middle of the ring area is the hole that exposes the first layer, and the hole surrounded by the assembled molecules and the assembled molecules (ie the second layer) are on the surface of the first layer The coverage rate is 26%.

[0026] The patent of the present invention is to provide a method for preparing a two-dimensional porous nanomaterial on the surface of a m...

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Abstract

The invention provides a method for preparing a two-dimensional porous nano material based on diphenylacetylene molecule self-assembly. The method aims to prepare the two-dimensional nano material with a uniform porous structure on the surface of the single crystal by utilizing diphenylacetylene molecule self-assembly under an ultrahigh vacuum condition. The method comprises the following steps that 1, argon ion sputtering is carried out on a metal single crystal substrate, then annealing is carried out, and the sputtering and annealing processes are repeated; and 2, the metal single crystal treated in the step 1 is placed in an ultrahigh vacuum preparation cavity and heated to 50-53 DEG C, then diphenylacetylene molecules are deposited on the surface of the metal single crystal under the room temperature condition, the deposition time is 3-5 s, and the two-dimensional porous nanometer material is prepared. The method is simple in process, and the nanometer material with the uniform porous structure can be obtained. The pore size is 3.37 nm to 3.46 nm, the thickness of the pore wall is 0.7 nm to 1.2 nm, the height is 115 pm to 125 pm, and the coverage rate can reach 18% to 30%.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a method for preparing a two-dimensional porous nanomaterial on the surface of a metal single crystal based on the self-assembly of tolanylacetylene molecules. Background technique [0002] The construction of 2D porous nanomaterial networks composed of organic molecules on solid surfaces has attracted extensive attention due to their possible applications including gas storage, heterogeneous catalysis, information storage, and sensor devices. They can be made by the mechanism of molecular self-assembly, in which molecules find themselves in specific positions, and the self-assembly is stabilized by intermolecular interactions. Diphenylacetylene is widely used as a structural fragment in organic synthesis and as a ligand in organometallic chemistry. However, due to its relatively small molecular weight, it is easily pumped away by molecular pumps under ultra-high vacuum, and it is di...

Claims

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Application Information

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IPC IPC(8): C23C14/12C23C14/02
CPCC23C14/12C23C14/022C23C14/02
Inventor 卢慧鄂文龙马志博杨学明
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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