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Ion-conductive metal-organic framework thin film chemical sensor and preparation method

A chemical sensor and organic framework technology, applied in the field of chemical sensors, can solve problems such as poor sensitivity and selectivity, single mode of action, single carrier characteristics, etc., achieve high sensitivity and selectivity, adjust pore size, and facilitate pore size effect of size

Active Publication Date: 2021-09-03
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface area of ​​the sensing layer is low. At the same time, only a few gas molecules can diffuse and transport inside the film and interact with carriers, and the mode of action is relatively single, so the sensitivity and selectivity are poor.
In addition, the long-term stability of the above-mentioned semiconductors is difficult to guarantee due to the lifetime of organic molecules in an electric field environment.
In addition, chemical sensors based on MOF materials have been developed, but the MOF materials used in existing MOF chemical sensors are generally insulating or electronically conductive, and the use of electronically conductive MOF material carrier (that is, electronic) characteristics Single, which limits the performance and application range of the sensor
In people's daily life, low-cost and easy-to-operate detection methods are needed, and the application of existing detection instruments and methods is limited by many aspects

Method used

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  • Ion-conductive metal-organic framework thin film chemical sensor and preparation method
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  • Ion-conductive metal-organic framework thin film chemical sensor and preparation method

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preparation example Construction

[0029] The present invention also provides a method for preparing an ion-conductive metal-organic framework thin-film chemical sensor for monitoring lithium-ion battery electrolyte leakage, comprising the following steps:

[0030] Step 1, making a substrate 1 .

[0031] Step 2, using acetone and isopropanol to ultrasonically clean the substrate 1 in sequence, then rinsing the substrate 1 with ethanol and deionized water, and finally drying the surface of the substrate 1 with nitrogen to obtain a dried substrate 1 .

[0032] Step 3, using a variety of organic ligands, spray the atomized solution containing 0.1-0.5mM organic ligands evenly on the surface of the 1-5mM deionized aqueous solution that coordinates metal ions, and a metal-organic framework compound film appears on the water surface , and then use a syringe to remove the residual reaction solution on the surface of the metal-organic framework compound film, let the film naturally fall on the surface of the pre-placed ...

Embodiment 1

[0038] figure 2 It is the chemical structure diagram of the organic ligand of the ion-conducting metal-organic framework thin film chemical sensor of the present invention, image 3 It is the metal-organic framework compound material of the ion-conductive metal-organic framework thin film chemical sensor of the present invention, with 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin as the organic ligand, and the copper ion as the metal Chemical structure diagram of nodes as an example.

[0039] figure 2 (a), R = COOH, OH or NH 2 ;M=H 2 , Mn, Fe, Co, Ni, Cu, Zn, etc., are the chemical structure diagrams of carboxyl, hydroxyl or amino porphyrins substituted by various central metals, figure 2 (b) M=H 2 , Mn, Fe, Co, Ni, Cu, Zn, etc., are the chemical structure diagrams of various central metal-substituted pyridyl porphyrins, figure 2 (c) is the chemical structure diagram of trimesic acid, figure 2 (d) is the chemical structure diagram of pyromellitic acid, figure 2 (...

Embodiment 2

[0052] The material, preparation method and preparation process used in this embodiment are the same as those in embodiment 1, but the test method is different from that of embodiment 1, and the capacitance change of the sensor is used as the output signal.

[0053] Figure 5 It is a schematic diagram of the response of the ion-conducting metal-organic framework thin-film chemical sensor in Example 2 of the present invention to different leakages of lithium-ion battery electrolytes based on capacitance changes.

[0054] The testing process is as follows: the metal-organic framework compound thin film chemical sensor 100 is fixed at the bottom of a 6L closed cavity, and the sensor is connected to a TH2827C LCR meter testing instrument through wires. After the test device is adjusted to work, the cavity is filled with air as the background gas, the cover of the cavity is covered, and the capacitance signal of the sensor is tested, and the capacitance signal is used as an electrica...

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Abstract

The invention provides an ion-conductive metal-organic framework thin film chemical sensor and a preparation method thereof. The sensor includes: a substrate, a metal-organic framework compound thin film layer and an electrode; the method includes: making a substrate; ultrasonically cleaning and rinsing the substrate and drying to obtain a dry substrate; using a variety of organic ligands, the atomized solution containing organic ligands is evenly sprayed on the surface of the deionized aqueous solution of the coordinated metal ions, and a metal-organic framework compound film appears on the water surface , and then remove the residual reaction solution on the surface of the film, so that the film naturally falls on the surface of the substrate. After natural drying, the film is heated under vacuum to remove the residual moisture, and a metal-organic framework compound film layer is obtained; use a mask to block the metal -on the top of the metal-organic framework compound thin film layer, and the electrode is vapor-deposited on the upper surface of the metal-organic framework compound thin film layer to obtain an ion-conductive metal-organic framework compound thin film chemical sensor.

Description

technical field [0001] The invention belongs to the field of chemical sensors, and in particular relates to an ion-conductive metal-organic frame film chemical sensor and a preparation method. Background technique [0002] With the continuous development of science and technology, people's demand for ideal power is also increasing. As one of the most ideal power and energy storage systems, lithium-ion batteries have become an indispensable part of new energy systems in modern society due to their high charge and discharge rates and high energy density. However, as a chemical energy storage battery, the safety performance of lithium-ion batteries under conditions such as heating, extrusion, and collision has aroused great concern from consumers. In particular, the explosion of Samsung Galaxy Note 7 mobile phones, and the spontaneous combustion of electric vehicles such as Tesla Model S and NIO ES8 have cast a shadow on the further commercial application of lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/02G01N27/30
CPCG01M3/02G01N27/30
Inventor 黄佳陆洋张诗琦
Owner TONGJI UNIV
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