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Method for improving gas-sensitive response performance of ZIF-8 to ethanol gas

A ZIF-8 and gas technology, which is applied in the field of improving the gas-sensing response performance of ZIF-8 to ethanol gas, can solve the problems of restricting development, high power consumption and high working temperature, so as to improve the gas-sensing response performance and avoid the decrease of stability. , the effect of reducing the working temperature

Pending Publication Date: 2021-08-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that ZIF-8 has problems such as high operating temperature, poor gas selectivity, high power consumption, and poor stability, which have always restricted its development in the field of gas-sensitive materials.

Method used

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  • Method for improving gas-sensitive response performance of ZIF-8 to ethanol gas
  • Method for improving gas-sensitive response performance of ZIF-8 to ethanol gas
  • Method for improving gas-sensitive response performance of ZIF-8 to ethanol gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of ZIF-8:

[0029] Adopt normal temperature and pressure method to prepare ZIF-8, the specific preparation method is: under room temperature condition, Zn(NO 3 ) 2 ·6H 2 O (1.485 g, 4.99 mmol) was added to 20 ml of methanol solution and stirred ultrasonically for 3 minutes. 2-Methylimidazole (1.642g, 20.00mmol) was added to another beaker containing 20ml of methanol and stirred ultrasonically for 3 minutes, and the two colorless solutions obtained by stirring were mixed and stirred ultrasonically for 2 minutes, then allowed to stand 24h. Next, the mixed solution was put into a centrifuge and washed three times by ethanol centrifugation, and the obtained white product was dried at a constant temperature at 70° C. to finally obtain the product ZIF-8.

[0030] The SEM figure of the ZIF-8 prepared above is as follows figure 1 As shown, the XRD pattern is as figure 2 shown by figure 1 and figure 2 It can be seen that ZIF-8 was successfully synthesized; ...

Embodiment 2

[0035] ZIF-8 tests 200ppm ethanol gas, including the following steps:

[0036] Add ultraviolet light LED light source in four-channel gas-sensitive test instrument, make ultraviolet light LED light source be in passage state, first carry out ultraviolet light excitation to the ZIF-8 that embodiment 1 prepares; Treat that ZIF-8 is in light excitation condition After the chemical equilibrium state, that is, after the resistance value of ZIF-8 does not change under air conditions, the thermal excitation conditions are added to the ZIF-8 material, the temperature is 50°C, and the ultraviolet light excitation is continued during the test period; the test The gas sensitive response of ZIF-8 to the concentration of 200ppm ethanol gas under the low temperature condition of 50℃. Such as Figure 4 shown by Figure 4 It can be seen that under the condition of combined photothermal excitation, ZIF-8 has an excellent gas sensitive response to 200ppm ethanol gas at a low temperature of 50...

Embodiment 3

[0038] ZIF-8 tests 200ppm ethanol gas, including the following steps:

[0039] Add ultraviolet light LED light source in four-channel gas-sensitive test instrument, make ultraviolet light LED light source be in passage state, first carry out ultraviolet light excitation to the ZIF-8 that embodiment 1 prepares; Treat that ZIF-8 is in light excitation condition After the chemical equilibrium state, that is, after the resistance value of ZIF-8 does not change under air conditions, the thermal excitation condition is added to the ZIF-8 material, the temperature is 75°C, and the ultraviolet light excitation is continued during the test period; the test Gas-sensing response of ZIF-8 to 200ppm ethanol gas at a low temperature of 75°C. The results show that under the conditions of combined photothermal excitation, ZIF-8 has an excellent gas-sensing response to 200ppm ethanol gas at a low temperature of 75°C.

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Abstract

The invention discloses a method for improving gas-sensitive response performance of ZIF-8 to ethanol gas, and belongs to the technical field of gas-sensitive materials.The method comprises the following steps that firstly, ultraviolet light excitation is conducted on ZIF-8, and then thermal excitation is increased under the condition that ultraviolet light excitation is kept; by adopting the method disclosed by the invention, the ZIF-8 has excellent gas-sensitive response to ethanol gas with the concentration of 100-300ppm under the low-temperature condition of 25-75 DEG C, the working temperature of the ZIF-8 porous wide-band gap material is reduced, the gas-sensitive response performance of the ZIF-8 porous wide-band gap material to the ethanol gas is improved, and the ZIF-8 porous wide-band gap material can be applied to an ethanol low-temperature gas sensor; and the method provided by the invention provides a thought for subsequent research on the application of the wide bandgap semiconductor gas-sensitive material to the low-temperature sensor.

Description

technical field [0001] The invention belongs to the technical field of gas sensitive materials, and in particular relates to a method for improving the gas sensitive response performance of ZIF-8 to ethanol gas. Background technique [0002] Metal-organic frameworks (Metal-Organic Frameworks), referred to as MOFs, are organic-inorganic hybrid porous materials with high specific surface area and large porosity formed by self-assembly between metal ions or clusters and organic ligands. Material. MOFs not only have a wide variety, variable composition, and adjustable pore size, but also have the characteristics of high specific surface area, unique pore structure, and large porosity. This provides a new idea for the research of gas sensors. Many researchers have applied metal-organic framework materials to gas detection to explore new gas-sensing materials. [0003] Among them, as a series of materials in MOFs, Zeolitic Imidazolate Frameworks (Zeolitic Imidazolate Frameworks,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 杨黎杜倩郭胜惠高冀芸侯明胡途
Owner KUNMING UNIV OF SCI & TECH
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