Graduated porous titanium dioxide microsphere, and preparation method and applications thereof

Abstract

The invention discloses a graduated porous titanium dioxide microsphere, and a preparation method and applications thereof. According to the preparation method, preparation is completed via one-step hydrothermal reaction; the preparation method is simple and convenient; yield is high; large-scale production can be realized easily; the graduated porous titanium dioxide microsphere possesses a microspheric structure; microsphere diameter ranges from 2 to 5<mu>m; the graduated porous titanium dioxide microsphere is obtained via assembling of truncated-octahedral nanocrystals; the particle size of the truncated-octahedral nanocrystals ranges from 50 to 100nm; anatase phase high-energy (001) crystal faces are exposed; the graduated porous titanium dioxide microsphere possesses a graduated porous structure; pore size ranges from 5 to 20nm. Indirectly-heated gas sensor technology can be adopted for coating, welding, and aging of the graduated porous titanium dioxide microsphere material so as to prepare semi-conductive type gas sensors. It is shown by gas sensitive property testing results that the semi-conductive type gas sensors possesses structural enhanced gas-sensitive property on acetone, and research approach of resistance-type semiconductor gas sensors is widened.

Description

technical field [0001] The invention relates to a graded titanium dioxide microsphere, in particular to a graded porous titanium dioxide microsphere and its preparation method and application. Background technique [0002] Due to the small size effect, surface effect, quantum size effect and quantum tunneling effect of nanoparticles, they have characteristics that conventional materials do not have in terms of magnetism, light, electricity, and sensitivity. Therefore, they are used in electronic materials, optical materials, and catalysis. , sensing, ceramic toughening and other aspects have broad application prospects. However, in the process of actual use, it is found that nanoparticles also have many problems. For example, although their specific surface area is large and their activity is high, their structure is unstable and easy to agglomerate, resulting in a sharp decrease in their actual available specific surface area and activity. Assembling nanoparticles (includi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a hierarchical porous titanium dioxide microsphere and its preparation method and application, which solves the shortcomings of the existing hierarchical porous titanium dioxide material, such as complex preparation methods and the need for subsequent treatment, and constructs this material for the first time. Gas sensor, applied to the detection of acetone gas

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