CoO/SnO2 sensitive material and preparation method thereof
A technology of sensitive materials and hydrothermal method, applied in the direction of nanotechnology for materials and surface science, analytical materials, material resistance, etc., can solve the problem of compound semiconductor oxides with only uniform morphology, difficult to control reaction conditions, and few research reports to achieve excellent ethanol sensitivity performance, good ethanol response, and simple operation
A technology of sensitive materials and hydrothermal method, applied in the direction of nanotechnology for materials and surface science, analytical materials, material resistance, etc., can solve the problem of compound semiconductor oxides with only uniform morphology, difficult to control reaction conditions, and few research reports to achieve excellent ethanol sensitivity performance, good ethanol response, and simple operation
CN106970118AInactive Publication Date: 2017-07-21JILIN UNIV
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Embodiment 1
[0054] CoO / SnO 2 Sensitive materials are used to make ethanol gas sensors, the specific method is as follows,
[0055] 1) SnCl 2 2H 2 O (0.9g), Na 3 C 6 h 5 o 7 2H 2 O (2.94g) was dissolved in 15mL deionized water with stirring, then 15mL NaOH (0.12g) aqueous solution was added dropwise and then stirred for 20 minutes to form a homogeneous solution;
[0056] 2) Put the homogeneous solution into a 45mL polytetrafluoroethylene kettle and seal it, put it in an oven at 180°C for 12 hours, and then cool it down to room temperature naturally;
[0057] 3) After collecting the sample, centrifuge it with ethanol and deionized water for 3 to 5 times, then put the sample in a petri dish at 80°C for 12 hours, collect the sample, and calcinate the above sensitive material at 500°C for 2 hours to obtain SnO 2 Sensitive materials with flower-like hierarchical structure;
[0058] 4) Take a certain amount of SnO 2 Put the powder into 10mL of a mixed aqueous solution of ammonia and hy...
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Abstract
The invention discloses a CoO / SnO2 sensitive material and a preparation method thereof. The CoO / SnO2 sensitive material is composed of a SnO2 flowerlike hierarchical structure and CoO nanoparticles growing on the surface of the SnO2 flowerlike hierarchical structure. The SnO2 flowerlike hierarchical structure is larger than 1micron in size and formed by nanosheets thinner than 100nm, and the CoO nanoparticles grow on the flowerlike hierarchical structure. The method is simple, and the CoO / SnO2 sensitive material is prepared according to a two-step hydrothermal method. Firstly, the flowerlike hierarchical structure SnO2 is prepared according to the hydrothermal method; secondly, the obtained flowerlike hierarchical structure SnO2 is treated by ammonium hydroxide and hydrogen peroxide mixed aqueous solution; thirdly, the SnO2 treated by the solution serves as a reactant for preparation of the CoO / SnO2 sensitive material according to the hydrothermal method. The CoO / SnO2 sensitive material and the preparation method thereof have advantages that surface active sites are increased, diffusion and permeation of gas on semiconductor oxide surfaces are promoted, and high sensitivity and long-term stability are realized.
Description
technical field [0001] The invention belongs to the technical field of oxide semiconductor gas sensors, and in particular relates to a composition of a CoO / SnO2 sensitive material and a preparation method thereof. Background technique [0002] Ethanol is an important industrial raw material. While making outstanding contributions to the national economy, it is also a polluting organic volatile gas. It is easy to volatilize at room temperature and enter the atmosphere. At present, alcohol-containing beverages and foods are getting more and more expensive. There are more and more alcohols in my country, especially in alcohol, and the number of illegal accidents of drunk driving is increasing day by day, which puts forward new requirements for the strength and level of traffic law enforcement. Therefore, the rapid and accurate detection of ethanol concentration has very important practical significance and practicality. value. [0003] A large number of research reports have con...
Claims
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Patent Timeline
21 Jul 2017
Publication
CN106970118A
- IPC
- G01N27/12; B82Y30/00; B82Y15/00
- CPC
- G01N27/127; B82Y15/00; B82Y30/00
- Inventors
- 王庆吉; 李旭