A conductive metal-organic framework for resistive gas sensors

A gas sensor and organic framework technology, applied in the fields of materials, electronics, and chemistry, can solve problems such as slow response speed, non-room temperature operation, and long recovery time, and achieve good stability, good repeatability, and simple preparation methods.

Inactive Publication Date: 2020-07-28
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of common gas sensing materials such as poor selectivity, slow response speed, long recovery time, and non-room temperature operation, and provide a new type of metal organic framework gas sensor with room temperature operation, fast response, and high selectivity. Sensitive material and its preparation method
And use this material to assemble a resistive gas sensor to detect harmful gases with high selectivity

Method used

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  • A conductive metal-organic framework for resistive gas sensors
  • A conductive metal-organic framework for resistive gas sensors
  • A conductive metal-organic framework for resistive gas sensors

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of new conductive metal-organic framework materials: Take 0.08mmol In(NO 3 ) 2 4H 2 O, 0.016mmol 9,10-bis(ethynylpyridine)anthracene was added to the reaction vessel, and 2.4×10 -3 mol N,N'-dimethylformamide (DMF) and 1.6×10 -3 mol HNO 3 , and then put the bottle into an oven at 100°C to react for 120 hours to obtain a crude indium metal organic framework; wash the crude indium metal organic framework with DMF and dry at 100°C to obtain an orange flake crystalline metal organic framework, The yield was 70% (calculated based on the amount of organic ligand).

[0029] The unit cell parameters of the novel indium metal organic framework material are 12.954(2), 14.453(5), 18.956(4), 102.510(12), 94.165(8), and 109.364(7). The novel indium metal organic framework material belongs to the triclinic crystal system and the P-1 space group.

[0030] The structural schematic diagram of the novel indium metal organic framework material is shown in figure 1 , whic...

Embodiment 2

[0035] Take 0.018mmol In(NO 3 ) 2 4H 2 O, 0.009mmol 9,10-bis(ethynylisophthalic acid)anthracene was added to the vial, and 2.4×10 -3 mol N,N'-dimethylformamide (DMF) and 1.6×10 - 3 molHNO 3 , and then put the reaction container in an oven at 100°C for 120h to obtain the crude indium metal organic framework; wash the crude indium metal organic framework with DMF and dry at 60°C to obtain orange-yellow strip crystals—purified The indium metal organic framework material has a yield of 25% (calculated based on the amount of organic ligands).

Embodiment 3

[0037] Take 0.018mmol In(NO 3 ) 2 4H 2 O, 0.036mmol 9,10-di(ethynyl isophthalic acid)anthracene was added to the reaction vessel, and 2.4×10 -3 mol N,N'-dimethylformamide (DMF), and 1.6×10 - 3molHNO 3 , and then put the reaction container into an oven at 100°C for 120 hours to react to obtain the crude indium metal organic framework; wash the crude indium metal organic framework with DMF and dry at 60°C to obtain orange-yellow strip crystals—purified The indium metal organic framework material has a yield of 35% (calculated based on the amount of organic ligands).

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Abstract

The invention relates to an indium-based conductive metal organic framework material applied to a resistance type gas sensor, and a preparation method thereof, and belongs to the crossing field of study of chemistry, material science, electronic science and the like. Novel indium-based conductive metal organic framework material synthesized by the invention has a regular periodicity framework structure and adjustable and controllable particle dimension. The method has the advantages that the operation is simple and convenient; the cost is reduced; the important application is realized to the technical fields of assembly of the resistance type gas sensors and the like. The assembled resistance type gas sensor has the characteristics of wide response range, high response speed, good repeatedperformance, room temperature operation and the like, and can be particularly used for selectively sensing and detecting volatile organic amine harmful substances.

Description

technical field [0001] The invention belongs to the technical fields of chemistry, material and electronics, and in particular relates to a preparation method of a stable conductive metal organic framework material and gas sensing application. Background technique [0002] Gas sensing has important applications in industrial production, process control, environmental monitoring, food quality testing, and medical analysis. At present, there are many kinds of gas sensing materials, such as: ceramic materials, semiconductor materials, polymer materials and so on. However, exploring highly responsive gas-sensing materials suitable for practical applications remains a challenge, especially in the commercial field. Semiconductor and ceramic materials have strong response and recovery capabilities, but the linear relationship between concentration and impedance is not ideal. Compared with this, the response and recovery of other materials are relatively slow. Therefore, the devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 邢宏珠王思萍魏红霞
Owner NORTHEAST NORMAL UNIVERSITY
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