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CN-122011410-A - Two-dimensional conductive metal organic framework material and preparation method and application thereof

CN122011410ACN 122011410 ACN122011410 ACN 122011410ACN-122011410-A

Abstract

The invention discloses a two-dimensional conductive metal organic framework material, a preparation method and application thereof, wherein the metal organic framework material has a chemical formula of Mg 3 (HITP) 2 and a two-dimensional layered stack structure, and magnesium defects and nitrogen vacancies exist in the two-dimensional conductive metal organic framework material. The preparation method comprises the steps of uniformly stirring and mixing hexaaminotoluene hydrochloride solution, magnesium acetate solution and catalyst, stirring and reacting, centrifugally separating, collecting solid precipitate, washing, and drying to obtain the two-dimensional conductive metal organic framework material. The two-dimensional conductive metal organic framework material has a two-dimensional conjugated molecular structure, high conductivity, abundant defect structures and excellent gas adsorption capacity, shows high sensitivity, high selectivity, quick response and good stability to ammonia gas at room temperature, is suitable for flexible and portable gas sensing equipment, and has wide application prospects in the fields of environment monitoring, medical health, internet of things and the like.

Inventors

  • CHEN YUJIA
  • ZHANG RUI
  • REN YUAN
  • TAO LI

Assignees

  • 东南大学

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. A two-dimensional conductive metal organic frame material is characterized in that the chemical formula is Mg 3 (HITP) 2 , the two-dimensional conductive metal organic frame material has a two-dimensional layered stack structure, and magnesium defects and nitrogen vacancies exist in the two-dimensional conductive metal organic frame material.
  2. 2. A preparation method of a two-dimensional conductive metal organic frame material is characterized in that hexaaminotoluene hydrochloride solution, magnesium acetate solution and a catalyst are stirred and mixed uniformly, stirred and reacted, and solid precipitate is collected for washing and drying after centrifugal separation, so that the two-dimensional conductive metal organic frame material is obtained.
  3. 3. The method for preparing the two-dimensional conductive metal organic framework material according to claim 2, wherein the concentration of the hexaaminotoluene hydrochloride solution is 9-15 mmol/L, and the solvent is deionized water.
  4. 4. The method for preparing the two-dimensional conductive metal organic framework material according to claim 2, wherein the concentration of the magnesium acetate solution is 25-40 mmol/L, and the solvent is deionized water.
  5. 5. The method for preparing a two-dimensional conductive metal organic framework material according to claim 2, wherein the catalyst is ammonia water solution or sodium acetate solution, and the solvent is deionized water.
  6. 6. The method for preparing a two-dimensional conductive metal organic framework material according to claim 5, wherein the concentration of the ammonia water solution is 3-6 mol/L, and the concentration of the sodium acetate solution is 2-4 mol/L.
  7. 7. The method for preparing the two-dimensional conductive metal organic framework material according to claim 1, wherein the volume ratio of the hexaaminotoluene hydrochloride solution to the magnesium acetate solution to the catalyst is 10:10:3-5.
  8. 8. The method for preparing the two-dimensional conductive metal organic frame material according to claim 1, wherein the temperature of the stirring reaction is 65-85 ℃ and the time is 2-4 hours.
  9. 9. The use of a two-dimensional conductive metal-organic framework material according to claim 1 in a room temperature ammonia gas sensing device sensing layer.
  10. 10. The application of the two-dimensional conductive metal organic framework material in a room temperature ammonia gas sensor device sensing layer is characterized in that the sensing layer is coated on the surface of a Jin Cha finger electrode, and the response value of the room temperature ammonia gas sensor device to ammonia gas with the ammonia gas concentration of more than 50 to ppm reaches more than 39 percent.

Description

Two-dimensional conductive metal organic framework material and preparation method and application thereof Technical Field The invention belongs to a frame material and a preparation method and application thereof, and particularly relates to a two-dimensional conductive metal organic frame material and a preparation method and application thereof. Background Ammonia (NH 3) is widely used in industry and agriculture, but is toxic, irritating and corrosive, and long-term exposure to low-concentration ammonia can cause harm to human health. Currently, conventional ammonia gas sensors are mostly based on metal oxide semiconductors or solid-state electrolytes, and have problems of high operating temperature, large power consumption, poor selectivity, structural rigidity, and the like, and are difficult to meet the requirements of flexible and portable electronic devices (ACS cent. Sci. 2022, 8, 1196.; chi. Chem. Lett. 2021, 32, 1994). Most metal organic framework Materials (MOFs) are insulators, with low electrical conductivity, limiting their application in electrical sensing. The existing ammonia gas sensing needs to be further improved in defect regulation and performance optimization, and is poor in sensitivity, stability and selectivity. Disclosure of Invention The invention aims to: in order to overcome the defects in the prior art, the invention aims to provide a two-dimensional conductive metal-organic frame material with low power consumption, high selectivity, high sensitivity and quick response, and another aim of the invention is to provide a preparation method of the flexible and portable two-dimensional conductive metal-organic frame material, and further aims to provide an application of the two-dimensional conductive metal-organic frame material in a room temperature ammonia sensing device sensing layer. The chemical formula of the two-dimensional conductive metal organic frame material is Mg 3(HITP)2, and the two-dimensional conductive metal organic frame material has a two-dimensional layered stack structure, and magnesium defects and nitrogen vacancies exist in the two-dimensional conductive metal organic frame material. According to the preparation method of the two-dimensional conductive metal organic framework material, hexaaminotoluene hydrochloride solution (HATP & 6 HCl), magnesium acetate solution and catalyst are stirred and mixed uniformly, stirred and reacted, and solid precipitate is collected for washing and drying after centrifugal separation, so that the two-dimensional conductive metal organic framework material is obtained. Further, the concentration of the hexaaminotoluene hydrochloride solution is 9-15 mmol/L, and the solvent is deionized water. The concentration of the hexa-amino triphenylene hydrochloride solution is lower than 9 mmol/L, so that the yield is obviously reduced, and the concentration of the hexa-amino triphenylene hydrochloride solution is higher than 15 mmol/L, so that the sensing performance of the material is greatly reduced. Further, the concentration of the magnesium acetate solution is 25-40 mmol/L, and the solvent is deionized water. The concentration of the magnesium acetate solution is lower than 25 mmol/L, so that the yield is slightly reduced, and the concentration of the magnesium acetate solution is higher than 40 mmol/L, so that the sensing performance of the material is slightly reduced. Further, the catalyst is ammonia water solution or sodium acetate solution, and the solvent is deionized water. The catalyst is favorable for delaying the ineffective combination of the ligand and the metal precursor, regulating the ordered self-assembly process of metal ions and the organic ligand, exposing more active sites of MOF and improving the sensing performance of the material. Further, the concentration of the ammonia water solution is 3-6 mol/L, and the concentration of the sodium acetate solution is 2-4 mol/L. Further, the volume ratio of the hexaaminotoluene hydrochloride solution to the magnesium acetate solution to the catalyst is 10:10:3-5. Further, the temperature of the stirring reaction is 65-85 ℃ and the time is 2-4 hours. Further, the magnesium acetate solution and the catalyst are mixed, and after being stirred uniformly, the hexaaminotoluene hydrochloride solution which is equal to the magnesium acetate solution in volume is added rapidly, and the mixture is stirred and mixed at room temperature. The invention provides application of a two-dimensional conductive metal organic framework material in a room temperature ammonia gas sensor sensing layer. Further, the sensing layer is coated on the surface of the Jin Cha finger electrode, and the ammonia response value of the room temperature ammonia sensing device to more than 50 and ppm reaches more than 39 percent. The preparation principle is that ammonia water or sodium acetate is used as a synthesis catalyst, and abundant metal defects and nitrogen vacancies are introduced into the mater