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Ethanol gas sensor based on ZnO hollow flower ball and CdO nano-particle composite nanomaterial and preparation method of ethanol gas sensor

A technology of composite nanomaterials and gas sensors, which is applied in the fields of analyzing materials, material resistance, and material analysis through electromagnetic means, and can solve problems such as poor gas sensitivity characteristics and lower detection limit

Active Publication Date: 2017-05-31
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to change the morphology of the composite material, increase the carrier concentration and form a potential barrier by constructing a nanostructure based on the composite of ZnO hollow curds and CdO nanoparticles, so as to overcome the shortcomings of the poor gas-sensing properties of the two materials , to improve the sensitivity of ethanol gas detection and reduce the lower limit of detection

Method used

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  • Ethanol gas sensor based on ZnO hollow flower ball and CdO nano-particle composite nanomaterial and preparation method of ethanol gas sensor
  • Ethanol gas sensor based on ZnO hollow flower ball and CdO nano-particle composite nanomaterial and preparation method of ethanol gas sensor
  • Ethanol gas sensor based on ZnO hollow flower ball and CdO nano-particle composite nanomaterial and preparation method of ethanol gas sensor

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Effect test

Embodiment 1

[0035] With the Cd:Zn molar ratio of 0.44:100 (this ratio is within the scope of the raw material dosage described in the summary of the invention, right? Yes), the ZnO hollow flower bulb and CdO nanoparticle composite nanomaterial prepared as a sensitive material to make an ethanol gas sensor, the specific The production process is as follows:

[0036] 1. First, 30mg of ZnO hollow curd powder, 0.003g of Cd(NO 3 ) 2 4H 2 O(cadmium nitrate tetrahydrate), 0.006g of CH 4 N 2 Add S (thiourea) to 30mL DMF one by one, keep stirring until it is completely dissolved, then add 300μL isopropanol to the above solution, continue stirring for 10min, and then sonicate for 30min after stirring;

[0037] 2. The above solution was hydrothermally reacted at 160°C for 10h, cooled to room temperature, and the resulting precipitate was washed with deionized water and ethanol alternately for 7 times, then dried at 80°C, and then calcined at 500°C for 2h , finally obtained the composite nanomat...

Embodiment 2

[0041] Using Cd:Zn molar ratio of 0.88:100 (this ratio is within the range of the amount of raw materials described in the summary of the invention? Yes), the ZnO hollow flower ball and CdO nanoparticles composite nanomaterials are used to make ethanol gas sensors, and the specific manufacturing process as follows:

[0042] 1. First, 30mg of ZnO hollow curd powder, 0.006g of Cd(NO 3 ) 2 4H 2 O(cadmium nitrate tetrahydrate), 0.012g of CH 4 N 2 Add S (thiourea) to 30mL DMF one by one, keep stirring until it is completely dissolved, then add 300μL isopropanol to the above solution, continue stirring for 10min, and then sonicate for 30min after stirring;

[0043] 2. The above solution was hydrothermally reacted at 160°C for 10h, cooled to room temperature, and the resulting precipitate was washed with deionized water and ethanol alternately for 7 times, then dried at 80°C, and then calcined at 500°C for 2h , finally obtained the composite nanomaterial of ZnO hollow curd and C...

Embodiment 3

[0047] Using Cd:Zn molar ratio 2.64:100 (this ratio is within the range of raw materials used in the summary of the invention? Yes), the ZnO hollow flower ball and CdO nanoparticles composite nanomaterials are used to make ethanol gas sensors, and the specific manufacturing process as follows:

[0048] 1. First, 30mg of ZnO hollow curd powder, 0.012g of Cd(NO 3 ) 2 4H 2 O (cadmium nitrate tetrahydrate), 0.024 g of CH 4 N 2 Add S (thiourea) to 30mL DMF one by one, keep stirring until it is completely dissolved, then add 300μL isopropanol to the above solution, continue stirring for 10min, and then sonicate for 30min after stirring;

[0049] 2. The above solution was hydrothermally reacted at 160°C for 10h, cooled to room temperature, and the resulting precipitate was washed with deionized water and ethanol alternately for 7 times, then dried at 80°C, and then calcined at 500°C for 2h , finally obtained the composite nanomaterial of ZnO hollow curd and CdO nanoparticles;

...

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Abstract

The invention discloses an ethanol gas sensor based on a ZnO hollow flower ball and CdO nano-particle composite nanomaterial and a preparation method of the ethanol gas sensor and belongs to the technical field of oxide semiconductor gas sensors. The method comprises the steps of firstly taking zinc acetate dihydrate, glycine, sodium sulfate decahydrate and sodium hydroxide as starting raw materials, and a mixed solution of water and ethanol as a solvent and successfully preparing a ZnO hollow flower ball precursor by using a hydrothermal method; and burning in air to obtain ZnO hollow flower ball powder; and taking the ZnO hollow flower ball powder, cadimium nitrate tetrahydrate and thiourea as the starting raw materials, and a mixed solution of dimethylformamide (DMF) and isopropyl alcohol as the solvent, compounding CdO nano-particles on the ZnO hollow flower balls by using the hydrothermal method and then burning in air to obtain the ZnO hollow flower ball and CdO nano-particle composite nanomaterial. The defect that two materials are relatively poor in gas-sensing characteristics is overcome, and improvement of the detection sensitivity of an ethanol gas and reduction of a lower detection limit are achieved.

Description

technical field [0001] The invention belongs to the technical field of oxide semiconductor gas sensors, and in particular relates to an ethanol gas sensor based on ZnO hollow bulbs and CdO nanoparticle composite nanomaterials and a preparation method thereof. Background technique [0002] We are in the information age with the rise of artificial intelligence and the Internet of Things. In the chain of information acquisition-transmission-processing, sensors, as front-end devices for obtaining information, are equivalent to the complex sensory system of human beings, and play a vital role in the information technology chain. important role. As an important member of the sensor family, gas sensors play a pivotal role in safety, environment, medical and other fields. There are many types of gas sensors, and there are various classification methods. Gas sensors based on oxide semiconductors have outstanding advantages such as high sensitivity, adjustable selectivity, high reli...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 卢革宇王天双孙鹏刘凤敏高原马健揣晓红
Owner JILIN UNIV
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