CoO/SnO2 sensitive material and preparation method thereof

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...

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Problems solved by technology

The compound semiconductor oxide prepared by one-step hydrothermal method can form many tiny heterojunctions between two semiconductor oxides. One of the disadvantages is that the reaction conditions are difficult to control. It is inconvenient to distinguish the morphology characteristics, and the multi-step hydrothermal preparation of compound semiconductor oxides can better control the respective morphology of semiconductor oxides, forming obvious heterostructures, and the reaction conditions are easy to control

[0004] Oxide nanomaterials of tin and cobalt are widely used in the field of gas sensors due to their high-performance gas-sensing properties. Due to their unique gas-sensing properties, SnO 2 It has been extensively and extensively studied. Due to the multivalence and excellent catalytic properties of cobalt, Co 3 o 4 Attracting the research interests of a large number of researchers, and to Co 3 o 4 A relative amount of research has also been carried out. However, in the process of preparing sensitive materials for sensors, there are relatively few research reports on CoO. In order to improve the performance of ethanol gas sensors, the development of oxide semiconductor sensitive materials with high performance needs to be solved urgently.

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