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Hierarchical structure ZnO@ZnO nano-composite gas-sensitive material and preparation method thereof

A hierarchical structure and nano-composite technology, which is applied in the direction of analyzing materials, material resistance, and material analysis through electromagnetic means, can solve the problems of easy growth and immature application, achieve low detection limit and increase space active sites , the effect of increasing stability

Active Publication Date: 2018-06-29
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high heat conditions, quantum-sized zinc oxide is easy to grow, and even grows into large aggregates, so quantum-sized zinc oxide cannot be maturely used in the field of gas sensors as a sensor material.

Method used

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  • Hierarchical structure ZnO@ZnO nano-composite gas-sensitive material and preparation method thereof
  • Hierarchical structure ZnO@ZnO nano-composite gas-sensitive material and preparation method thereof
  • Hierarchical structure ZnO@ZnO nano-composite gas-sensitive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 61.5mg of 2-methylimidazole in a mixed solution of 60mL N,N-dimethylformamide (DMF) and water, where DMF: H 2 O=3:1, sonicate for 5 minutes to prepare the precursor solution; weigh 132 mg of zinc oxide nanopowder, add it to the prepared precursor solution, put all the solutions into a 100mL reactor, and heat The reactant was reacted for 24 hours, and then the reactant was taken out, filtered, washed with ethanol for several times, and then dried to obtain a hierarchical structure ZnO@ZnO precursor material; the obtained precursor material was placed in a tube furnace and heated at 500 ℃ calcination, the heating rate is 2 ℃ / min, the temperature is maintained for 1h, and the temperature is naturally lowered to room temperature to obtain a ZnO@ZnO nanocomposite gas-sensing material with a hierarchical structure.

[0029] The SEM image of the prepared hierarchical structure ZnO@ZnO nanocomposite gas-sensing material is shown in the attached figure 1 shown by figu...

Embodiment 2

[0031] Dissolve 61.5mg of 2-methylimidazole in a mixed solution of 60mL N,N-dimethylformamide (DMF) and water, where DMF: H 2 O=3:1, sonicate for 5 minutes to prepare the precursor solution; weigh 132 mg of zinc oxide nanopowder, add it to the prepared precursor solution, put all the solutions into a 100mL reactor, and heat The reactant was reacted for 24 hours, and then the reactant was taken out, filtered, washed with ethanol for several times, and then dried to obtain a hierarchical structure ZnO@ZnO precursor material; ℃ calcination, the heating rate was 2 ℃ / min, the temperature was maintained for 1h, and the temperature was naturally cooled to room temperature to obtain a ZnO@ZnO nanocomposite gas-sensing material with a hierarchical structure. At 375 ℃, the resistance response rate to ethanol with a concentration of 50ppm was 36.8.

Embodiment 3

[0033] Dissolve 30.75mg of 2-methylimidazole in a mixed solution of 60mL N,N-dimethylformamide (DMF) and water, where DMF: H 2 O=3:1, sonicate for 5 minutes to prepare the precursor solution; weigh 132 mg of zinc oxide nanopowder, add it to the prepared precursor solution, put all the solutions into a 100mL reactor, and heat After reacting for 24 hours, the reactant was taken out, filtered, washed with ethanol for several times, and then dried to obtain the ZnO@ZnO precursor material with hierarchical structure; the obtained precursor material was placed in a tube furnace and heated at 600 ℃ calcination, the heating rate was 2 ℃ / min, the temperature was maintained for 1 h, and the temperature was naturally cooled to room temperature to obtain a ZnO@ZnO nanocomposite gas-sensing material with a hierarchical structure. At 375 ℃, the resistance response rate to ethanol with a concentration of 50 ppm was 17.

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Abstract

The invention discloses a preparation method of a hierarchical structure ZnO@ZnO nano-composite gas-sensitive material. The preparation method comprises the following steps: dissolving 2-methylimidazole in an N,N-dimethylformamide and water mixed solution, and performing ultrasonic treatment to prepare a precursor solution; weighing a certain amount of zinc oxide nano-powder, adding the zinc oxidenano-powder into the prepared precursor solution, adding the obtained solution into a reaction kettle, performing a reaction at 70-100 DEG C for 12-48 h, taking out the obtained reaction product, performing suction filtration, washing the reaction product with ethanol multiple times, and drying the washed reaction product to obtain a hierarchical structure ZnO@ZnO precursor material; and placingthe obtained precursor material in a tubular furnace, and calcining the precursor material in an air atmosphere for 1 h to obtain the hierarchical structure ZnO@ZnO nano-composite gas-sensitive material. The preparation method does not produce toxic or harmful substances and facilitates environmental protection; ad the gas-sensitive material prepared in the invention has high sensitivity and selectivity to ethanol.

Description

technical field [0001] The invention relates to a gas-sensing material and a preparation method thereof, in particular to a hierarchical structure ZnO@ZnO nanocomposite gas-sensing material and a preparation method thereof, belonging to the technical field of gas-sensing materials. Background technique [0002] Zinc oxide is a kind of II-VI semiconductor optoelectronic material with high exciton binding energy (60meV) and wide bandgap (3.37eV). It exists stably in a single hexagonal wurtzite structure. Power microwave devices, light-emitting devices, lasers and many other aspects have broad application prospects. Zinc oxide is also one of the earliest studied gas-sensitive metal oxide materials. It acts as a nanoelectrode for H 2 、H 2 Gases such as S, ethanol and methanol have good response and high sensitivity. At present, zinc oxide can be prepared into nanomaterials with various shapes, such as nanoparticles, nanorods, nanoflowers or nanowires. At the same time, ZnO m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 齐天骄杨希左继王慧
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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