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MOX-coated NH2-MOFs thin film material as well as preparation method and application thereof

A thin film material and thin film technology, applied in the field of MOX@NH2-MOFs thin film material and its preparation, can solve the problems such as the inability to obtain ultra-fast response and recovery of gas sensors, the difficulty of rapid recovery of room temperature sensors, and the easy recombination of electron holes. Achieve high selectivity and high sensitivity rapid detection, overcome low selectivity and low sensitivity, and improve sensitivity

Pending Publication Date: 2022-07-01
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently, due to the NH 2 -MOFs materials and MOX need lattice matching, and NH 2 -There are difficulties in the continuous epitaxial growth of MOFs materials on the surface of MOX micro-nano materials; most NH 2 -MOFs are non-conductive and the electrons and holes generated by photoexcitation are easy to recombine, directly wrapping them on MOX will seriously affect the transmission of electrical signals in the material; NH 2 - The strong adsorption of nitro explosives by MOFs may make it difficult to quickly recover as a room temperature sensor, and it is impossible to obtain ultra-fast response and recovery of gas sensors
Therefore, there is currently no public information about MOX@NH 2 - MOFs thin film materials used in chemical resistive sensors for the detection of nitro explosive atmospheres under the assistance of light

Method used

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  • MOX-coated NH2-MOFs thin film material as well as preparation method and application thereof
  • MOX-coated NH2-MOFs thin film material as well as preparation method and application thereof
  • MOX-coated NH2-MOFs thin film material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] a TiO 2 The preparation method of the film includes the following steps:

[0057] Dissolve tetra-n-butyl titanate in ethanol, then immerse the clean sapphire substrate in ethanol solution dissolved in tetra-n-butyl titanate for 3 hours, then take it out directly, rinse with ethanol, dry naturally, and then 450 ℃ After calcination for 30min, a layer of TiO 2 A seed layer substrate composed of nanoparticles. Then fix the substrate face down in the Teflon liner, mix 6ml of hydrochloric acid with 6ml of deionized water, add 0.4ml of tetra-n-butyl titanate, and then add it to the Teflon liner together, and finally Tightly cover the inner lining, put it into a stainless steel autoclave, put the autoclave in an oven, keep it at 150°C for 4 hours, take out the substrate, rinse it with ethanol, dry it naturally, and calcine it at 450°C for 30 minutes to obtain a sapphire substrate. by TiO 2 The thin film composed of nanowire arrays, the SEM image is as follows figure 1 sho...

Embodiment 2

[0059] A SnO 2 The preparation method of the film includes the following steps:

[0060] The first solution was obtained by dissolving 3 mmol (357 mg) of KBr in 10 ml of deionized water. 1 mmol (350.6 mg) SnCl 4 .5H 2 O was dissolved in 60 ml of acetic acid to obtain a second solution. The first solution and the second solution were then mixed, and 10 ml of ethanol was added to obtain a third solution. Put the third solution into a teflon liner, add a cut glass slide of 1cm x 2cm, put the liner into a steel sleeve, put it in an oven at 200°C, and the solvent reacts. 24 hours to get SnO 2 film, whose SEM image is as figure 2 shown, is a continuous SnO consisting of an array of nanowires 2 The film is white, has good ultraviolet light absorption, has very obvious photoconductivity under ultraviolet light, and has a fast response speed.

Embodiment 3

[0062] A SnO 2 The preparation method of the film includes the following steps:

[0063] The first solution was obtained by dissolving 3 mmol (357 mg) of KBr in 10 ml of deionized water. 1 mmol (350.6 mg) SnCl 4 .5H 2 O was dissolved in 60 ml of acetic acid to obtain a second solution. The first solution and the second solution were then mixed, and 10 ml of ethanol was added to obtain a third solution. Then, 0.2 mmol Sn powder was added into the third solution to obtain the fourth solution. Then put the fourth solution into the teflon lining, add a cut glass slide of 1 cm × 2 cm, put the lining in the steel sleeve, put it in an oven at 200 ° C, the solvent Reaction for 24 hours to obtain SnO 2 film, whose SEM image is as image 3 shown. from image 3 It can be seen that after adding Sn powder, the morphology changed from the nanowire array in Example 2 to continuous and dense nanoparticles. The color of the powder scraped from the substrate also changed from white in...

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Abstract

The invention discloses an MOX-coated NH2-MOFs thin film material and a preparation method and application thereof, NH2-MOFs uniformly and continuously coats an MOX thin film with obvious photocatalytic activity, and the sensitivity of room-temperature gas-sensitive detection is improved by utilizing the good photocatalytic performance of MOX and introducing a photoactive free radical group. The MOX and the NH2-MOFs are compounded, so that the light absorption range can be widened, electrons can be quickly transferred into the MOX, electron-hole pairs are effectively separated, the photocatalytic activity of the composite material is improved, and the bottleneck problem that an existing chemical resistance type sensor based on metal oxide is low in selectivity and low in sensitivity when being used for testing nitro explosives at room temperature is solved; and high-selectivity and high-sensitivity rapid detection of the nitro explosive atmosphere at the room temperature is realized.

Description

technical field [0001] The invention relates to the field of functional material science and the field of gas-sensing sensing materials, in particular to a MOX@NH 2 -MOFs thin film material and its preparation method and application. Background technique [0002] Explosives play an irreplaceable role in national defense security, space application, and engineering blasting. At the same time, the environmental pollution caused by the explosion of these explosives and the terrorist attacks made by terrorists have always been subject to the entire society. focus on. TNT, DNT, TNP, RDX, etc. are a class of important standard nitro explosives. The saturated vapor pressure at room temperature is very low, such as TNT is 9ppb, DNT is 180ppb, TNP is 0.97ppb, RDX is 4.9ppt, low vapor pressure It is difficult for many technologies and materials to achieve real-time online high-sensitivity detection of their atmosphere at room temperature. Therefore, it is very important to explore ...

Claims

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Application Information

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IPC IPC(8): C08L87/00C08K3/22C08J5/18G01N21/33G01N27/12
CPCC08J5/18G01N27/126G01N21/33C08J2387/00C08K2003/2241C08K2003/2231C08K2201/005C08K2201/004
Inventor 徐刚邓韦华姚明水
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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