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A kind of titanium dioxide-metal organic framework array with uniform and continuous coating core-sheath structure and its preparation method and use

A metal-organic framework, titanium dioxide technology, applied in chemical instruments and methods, separation methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of uncontrollable thickness and uniformity, unsatisfactory photocatalytic activity, etc. , to achieve the effect of wide visible light response range, fast response-recovery ability, and high sensitivity

Active Publication Date: 2020-08-28
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

But the photoactive TiO 2 Controllable preparation of @MOFs core-sheath structure one-dimensional array thin film and room temperature gas-sensing application, there is no related report so far
This is mainly due to the following two limitations in the controllable preparation of photoactive MOX@MOFs core-sheath structure one-dimensional array thin films: On the one hand, most MOX@MOFs use ZnO, which is easy to grow but has poor photocatalytic activity. MOF growth points; on the other hand, in TiO 2 Attempts to grow photoactive MOF sheaths on one-dimensional array surfaces fail to effectively control thickness and uniformity at the nanoscale

Method used

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  • A kind of titanium dioxide-metal organic framework array with uniform and continuous coating core-sheath structure and its preparation method and use
  • A kind of titanium dioxide-metal organic framework array with uniform and continuous coating core-sheath structure and its preparation method and use

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preparation example Construction

[0053] As mentioned above, the present invention provides a method for preparing a titanium dioxide-metal organic framework array, the preparation method comprising the following steps:

[0054] 1) Prepare ligand organic solution, titanium source organic solution, ligand organic solution and titanium source organic solution respectively;

[0055] 2) The substrate with the titanium dioxide array is immersed in the ligand organic solution in step 1) for the first seed preparation, and then immersed in the titanium source organic solution for the second seed preparation, and the metal-organic framework seed is prepared. A substrate of a crystalline titania array;

[0056] Optionally, the first seed crystal preparation and the second seed crystal preparation can be repeated in sequence;

[0057] 3) The substrate of the titanium dioxide array with the metal organic framework seed crystal in step 2) is immersed in the mixed solution of the ligand organic solution and the titanium s...

preparation example 1

[0077] Al first 2 o 3The substrate was ultrasonically washed in a solvent of 1:1:1=acetone:isopropanol:water for half an hour, and then ultrasonically washed with deionized water for 10 minutes. Then rinse with ethanol and blow dry with nitrogen. Tetrabutyl titanate solution was repeatedly deposited on Al by pull coating method 3-5 times 2 o 3 After the substrate, a uniform layer of TiO was prepared by pyrolysis at 450°C for 15 minutes 2 seed layer. Then, after stirring and mixing 0.4mL tetrabutyl titanate and 12mL 6M HCl aqueous solution, it was transferred to a 20mL reaction kettle, and the above TiO 2 The seed wafer was immersed in the solution face down, and the reaction vessel was sealed. After reacting at 150°C for 4 hours, the TiO 2 Array substrates were thoroughly washed with deionized water and dried in air.

Embodiment 1

[0079] 0.3mmol organic ligand bdc-(NH 2 ) x (x=0, 1 and 2) were dissolved in 20 mL of a mixed solution of anhydrous dimethylformamide (DMF) and anhydrous methanol (the volume ratio of DMF and methanol was 9:1). Dissolve 0.15 mmol of tetrabutyl titanate in 20 mL of a mixed solution of anhydrous dimethylformamide (DMF) and anhydrous methanol (the volume ratio of DMF and methanol is 9:1). The multi-step thermal seeding method adopts the method of immersing the substrate with the titanium dioxide array in the organic solution of the above ligand and growing it at 150°C for 12 hours for the first seed crystal preparation, and then immersing the substrate with the titanium source organic solution at 150°C for 12 hours for the second seed crystal preparation. Secondary seed crystal preparation, the substrate of the titanium dioxide array with the metal organic framework seed crystal is prepared, which is the substrate of the titanium dioxide array with the metal organic framework se...

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Abstract

The invention discloses a titanium dioxide-metal organic framework array with a uniformly and continuously coated nuclear-sheath structure, and a preparation method and application of the titanium dioxide-metal organic framework array. The titanium dioxide-metal organic framework array is provided with the uniformly and continuously coated core-sheath structure, wherein titanium dioxide is used asa core, and a metal organic framework is used as a sheath layer; the titanium dioxide is titanium dioxide nanowires, and the metal organic framework is a Ti-based bdc-(NH2)x, wherein the x is 0, 1 or2. The number of amino groups in the titanium dioxide-metal organic framework array can be regulated and controlled, and the thickness and uniformity of the metal organic framework which is used as the sheath layer can also be regulated and controlled. Performance of the array structure can be changed through the regulation and control of the thickness and uniformity of the metal organic framework which is used as the sheath layer, and through the regulation and control of the number of amino groups contained in ligands in the metal organic framework which is used as the sheath layer, the change of performance of the metal organic framework can be influenced by regulating the visible light absorption capacity of the metal organic framework.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide-metal organic framework arrays, in particular to a titanium dioxide-metal organic framework array with a uniform and continuous coated core-sheath structure and its preparation method and application. Background technique [0002] Smart sensors are key building blocks for wearables, breath diagnostics, e-skins, smart vehicles, air quality monitoring and smart homes. Among them, the commonly used metal oxides (Metal oxides, MOX) chemical resistance gas sensor has the advantages of low price, long working life, and easy mass production. However, high operating temperature (>200°C) and poor selectivity are two bottlenecks restricting the application of MOX chemical resistance gas sensors in the above fields ([Yao, M.S.; Tang, W.X.; Wang, G.E.; Nath, B.; Xu, G., Adv. Mater. 2016, 28(26), 5229-5234.] and [Zhang, J.; Liu, X.; Neri, G.; Pinna, N., Nanostructured Materials for Room-Temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C08J5/18B01D53/86B01J31/38C08K7/08G01N27/12
Inventor 徐刚姚明水邓韦华
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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