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A Cobalt Tetroxide/Indium Oxide Nanotube Composite Thin Film Sensitive to Acetone

A technology of cobalt tetroxide and indium oxide is applied in the field of gas-sensing sensors to achieve the effects of low cost of raw materials, simple preparation, good application value and prospect

Active Publication Date: 2021-03-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

At present, based on the electrospinning method, In 2 o 3 The research on nanofibers used in gas sensors is currently focused on C 2 h 5 OH, H 2 For the detection of S, there are few reports on the gas-sensing properties of acetone (Sens.ActuatorsB:Chem.,2009,142,615)

Method used

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  • A Cobalt Tetroxide/Indium Oxide Nanotube Composite Thin Film Sensitive to Acetone
  • A Cobalt Tetroxide/Indium Oxide Nanotube Composite Thin Film Sensitive to Acetone
  • A Cobalt Tetroxide/Indium Oxide Nanotube Composite Thin Film Sensitive to Acetone

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Accurately weigh 0.45g of Co(NO 3 ) 2 ·6H 2 O and dissolved it in 3mL of deionized water, then weighed 5.5g of dimethylimidazole and dissolved it in 20mL of deionized water, after the above two solutions were stirred for 30min respectively, they were mixed together and kept stirring for 6h. Afterwards, the obtained product was washed three times with deionized water and methanol respectively by centrifugation, and placed in a blast drying oven at 80° C. for 24 hours to obtain a purple powder product, namely ZIF-67. Accurately weigh an appropriate amount of In(NO 3 ) 3 ·xH 2 O and an appropriate amount of ZIF-67, ZIF-67 and In(NO 3 ) 3 ·xH 2 The amount of O added is 0.2 g based on the total mass, and the mass percentage of ZIF-67 is 20 wt%. After weighing, add together by 2.21g C 2 h 5 OH and 2.21g DMF in the mixture, magnetically sti...

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Abstract

The invention provides a method for preparing a cobalt tetraoxide / indium oxide nanotube composite film that can be used to detect acetone, and belongs to the technical field of gas sensors. We mixed the metal-organic framework compound ZIF‑67 with an appropriate amount of indium nitrate hydrate and polyvinylpyrrolidone to prepare a precursor solution for electrospinning, and then prepared a ZIF‑67-doped fiber membrane by electrospinning. Cobalt tetraoxide / indium oxide nanotubes were obtained by annealing, and finally a spin-coating method was used to prepare tricobalt tetraoxide / indium oxide nanotube thin film devices, and then a gas-sensing test was performed. In the measured temperature range (100-300°C), the response value of the sample to 100ppm acetone at 300°C is as high as 38.79, and the response / recovery time is 13 seconds / 55 seconds. In addition, the cobalt tetraoxide / indium oxide nanotube thin film can also detect acetone (5-1600ppm) in a wide range of concentrations, and has high selectivity and stability to acetone. The sensor thin film has simple preparation method, low raw material cost, excellent material film performance and good repeatability, and has good application value and prospect.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to an acetone-sensitive tricobalt tetroxide / indium oxide nanotube composite film and a preparation method thereof. Background technique [0002] Acetone (Acetone) is a relatively common volatile organic compound (Volatile Organic Compounds, VOCs), which is widely used in industrial production. It is flammable and explosive, and acetone has certain health hazards. Exposure to acetone for a long time, even at a low concentration, can cause chronic poisoning such as nose, throat and lung inflammation, headache, dizziness, and nausea (Sens.Actuators B: Chem., 2018, 255, 1701). If an acetone leakage accident occurs in a densely populated factory workshop, the consequences will be disastrous. In addition, in the medical field, exhaled acetone has been recognized as a marker of diabetes, and healthy people and diabetics can be distinguished by detecting the content of acetone in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04C01G15/00B82Y40/00B82Y30/00G01N27/30
CPCB82Y30/00B82Y40/00C01G15/00C01G51/04G01N27/30
Inventor 祝磊鲁文博熊雅常晓李坤乔煦容薛庆忠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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