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Metal organic framework/graphene composite structure and application thereof in identifying gas molecules

A metal-organic framework and graphene composite technology, which is applied in the direction of graphene, single-layer graphene, non-metallic elements, etc., can solve the problems of scarcity of reports on MOF applications and obstacles to applications, and achieve good application prospects, good transparency, and high The effect of conductivity

Active Publication Date: 2020-07-31
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, the transparency of these glassy MOFs can be optimized, but MOF crystals themselves are non-conductive and very brittle. These characteristics greatly hinder their application in the field of transparent electronic devices, making reports on the application of MOF in the field of transparent electronic devices very scarcity

Method used

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  • Metal organic framework/graphene composite structure and application thereof in identifying gas molecules
  • Metal organic framework/graphene composite structure and application thereof in identifying gas molecules
  • Metal organic framework/graphene composite structure and application thereof in identifying gas molecules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: Single-layer graphene is grown on both sides of copper foil by chemical vapor deposition and transferred to a silicon wafer or quartz substrate to epitaxially grow a metal-organic framework structure

[0055] In the first step, in the chemical vapor deposition system, the furnace is heated to 1050 ° C, vacuumed, and then the copper foil is passed through 500 sccm H at high temperature 2 Carry out annealing treatment for 30 min; after the annealing is completed, feed 50 sccm hydrogen and 40 sccm methane to grow single-layer graphene, and cool it out after 30 min;

[0056] In the second step, use O 2 Treat the surface of silicon or quartz substrate with plasma at a power of 50 W for 20 minutes; then react with trichloro(1H,1H,2H,2H-perfluorooctyl)silane (5 μL) for 6 hours in a sealed system at 85°C , so that a self-assembled hydrophobic monolayer film is obtained on the silicon or quartz surface, and then the copper foil is pressed on the silicon wafer or quar...

Embodiment 2

[0058] Example 2: Characterization of Ni-CAT-1 / SLG composite structure obtained by epitaxial growth by transmission electron microscope, scanning electron microscope, atomic force microscope, and grazing incidence small-angle X-ray diffraction

[0059] In the first step, the morphology of the Ni-CAT-1 / SLG composite structure at different thicknesses was characterized by scanning electron microscopy. It can be seen that the graphene surface is uniformly covered by Ni-CAT-1 crystals ( figure 2 (C)); the SEM of the cross-section characterizes the morphology and thickness (25 nm) of the Ni-CAT-1 / SLG composite structure in the cross-section ( image 3 (A));

[0060] In the second step, the Ni-CAT-1 / SLG composite structure was transferred to a TEM copper grid for TEM characterization and analysis; under low magnification, the Ni-CAT-1 crystals were uniformly and densely arranged on the graphene surface ( image 3 (B)), the high-resolution TEM can visually see the one-dimensional c...

Embodiment 3

[0063] Example 3: Using transmission spectroscopy and electrical tests, it is proved that the Ni-CAT-1 / SLG composite structure has good transparency and electrical conductivity

[0064] The first step is to take optical photos of the Ni-CAT-1 / SLG composite structure and graphene at different thicknesses. It can be seen that both the graphene and the composite structure have good transparency ( Figure 7 A); As the thickness of the Ni-CAT-1 / SLG composite structure increases, the transparency gradually decreases;

[0065] In the second step, the transmittance of the Ni-CAT-1 / SLG composite structure and graphene at different thicknesses is quantified by transmission spectroscopy; it can be seen that at 550 nm, the 10 nm Ni-CAT-1 / SLG composite The transmittance of the structure is 95.7%, and as the thickness increases, the transmittance decreases gradually ( Figure 8 );

[0066] The third step is to calculate the conductivity by assembling resistive devices of Ni-CAT-1 / SLG comp...

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Abstract

The invention belongs to the technical field of gas molecule recognition, and particularly relates to a metal organic framework / graphene composite structure and application thereof in recognizing gasmolecules. The metal organic framework / graphene composite structure is a composite structure with high transparency and conductivity, and is obtained by taking single-layer graphene as a template andepitaxially growing a metal organic framework according to a lattice symmetry matching principle; and an electronic chemical device designed on the basis of the material can recognize different gas molecules. The composite structure can monitor gas molecules in real time at the room temperature, and is high in sensitivity and wide in linear range of detection signals. The gas molecules can be further identified by fitting a gas molecule response curve through chemical reaction kinetics. The composite structure is integrated on a flexible transparent substrate, and the device is still kept stable after the composite structure is continuously folded for 200 times. The composite structure can be selected or modified according to different gas molecules so as to realize other selective recognition.

Description

technical field [0001] The invention belongs to the technical field of gas molecule recognition, and in particular relates to a metal organic framework / graphene composite structure and its application in gas molecule recognition. Background technique [0002] Transparency is a popular element in contemporary design and a key feature of many useful materials such as glass, plastic and crystal in people's everyday lives. Due to the increasing consumer demand for electronic smart products, it is important to design transparent electronic products that are compatible with lenses, display panels, floor-to-ceiling windows, and car windshields. Likewise, the integration of transparent electronics into personal portable devices for real-time monitoring of biological signals (such as pulse, respiration, and blood pressure) and external environmental conditions (such as temperature, humidity, and gaseous pollutants in the air) is also very promising. attractive. Key components in tr...

Claims

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Application Information

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IPC IPC(8): C01B32/186C01B32/194G01N27/12C08G83/00
CPCC01B32/186C01B32/194G01N27/125C08G83/008C01B2204/02G01N27/4141G01N27/4146G01N27/126G01N27/127
Inventor 孙正宗邓鹤翔吴洁
Owner FUDAN UNIV
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