An acetone-sensitive zinc cobaltate nanomulti-shell yolk-shell film
A zinc cobaltate, sensitive technology, applied in the field of gas sensors, can solve the problems of rare research on nano-multi-shell yolk-shell structure, achieve good application value and prospects, good repeatability, and simple preparation
Active Publication Date: 2020-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0005] ZnCo 2 o 4 The research on the nano-multi-shell yolk-shell structure is rare, and this structure is rarely used for gas detection
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Embodiment 1
[0021] Example 1, 50 milliliters of deionized water was added to glucose (0.5 mol / liter), and stirred to form a clear solution. This solution was subjected to hydrothermal reaction, and the hydrothermal condition was 180° C. for 8 hours. The precipitates formed after the reaction were centrifuged and washed several times with deionized water and absolute ethanol, and then dried in a vacuum oven at 80° C. to obtain carbon sphere particles. Dissolve 100 mg of the above carbon sphere particles in 20 ml of ethanol and sonicate for 15 minutes. Dissolve 0.219 g of zinc nitrate hexahydrate, 0.582 g of cobalt nitrate hexahydrate, and 0.3 g of urea in 5 ml of deionized water and stir evenly, then mix this solution with the above carbon solution evenly. Put the mixed solution in an airtight container, react in a water bath at 80°C for 24 hours, keep stirring during the reaction, and then centrifuge, wash and dry the obtained precipitate. The above precursor powder was placed in a tube...
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Abstract
The invention provides a method for preparing a zinc cobaltate (ZnCo2O4) nano-multi-shell yolk-shell film capable of detecting acetone and belongs to the technical field of gas-sensitive sensors. The method comprises the steps of proportionally mixing zinc nitrate hexahydrate, cobalt nitrate hexahydrate and urea, preparing a ZnCo2O4 nano-multi-shell yolk-shell precursor by taking carbon spheres as a template, then, carrying out heat treatment so as to obtain a ZnCo2O4 nano-multi-shell yolk-shell structure, and finally, preparing a finished film device by a drip coating method. In a detected temperature range (100 DEG C to 300 DEG C), a ZnCo2O4 nano-multi-shell yolk-shell sensor has the highest sensitivity to the acetone of 500ppm at the temperature of 200 DEG C, the sensitivity is 38.2, the response time is 19 seconds, and the recovery time is 71 seconds. Comparing the gas-sensitive response of ZnCo2O4 nanotubes, ZnCo2O4 nanosheets and a ZnCo2O4 multi-shell yolk-shell structure to the acetone, the ZnCo2O4 multi-shell yolk-shell structure has higher sensitivity on the acetone, and the response / recovery time is shorter. The sensor film is simple in preparation method, low in raw material cost, excellent in material film performance and good in repeatability and has very good application values and prospects.
Description
technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to the preparation of a zinc cobaltate nano multi-shell yolk-shell film and the research on its gas-sensing performance to acetone. Background technique [0002] Acetone is a colorless, volatile, toxic liquid and an excellent organic solvent. As an important industrial raw material, acetone is widely used in the pharmaceutical industry such as the preparation of pesticides. On the other hand, due to the toxicity of acetone, when the concentration of acetone is higher than 173ppm, it will cause damage to the eyes, ears, central nervous system, etc. (J. Mater. Sci: Mater. Electron. 2016, 27, 2086). Exceptionally, medical research has shown that the content of acetone in the exhaled breath of diabetic patients is greater than 1.8ppm, which is significantly higher than that of normal people (RSC Adv., 2015, 5, 59976). Therefore, how to develop an acetone gas sensor wit...
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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 薛庆忠熊雅朱纵野丁德恭鲁文博
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)