Method for preparing superfine hollow titanium dioxide nanospheres with diameter smaller than 100 nm

Abstract

The invention provides a method for preparing superfine hollow titanium dioxide nanospheres with diameter smaller than 100 nm. The method comprises the steps of using nanocarbon sphere particles as a template; evenly dispersing the nanocarbon sphere particles (CSs) with different grain sizes in an organic solvent to form a carbon sphere sol system, and then adding a titanic acid tetra-n-butyl solution diluted by the organic solvent dropwise to obtain nano CSs@TiO2 sol with wall thickness and grain size controllable through reaction; conducting centrifugal treatment on the CSs@TiO2 sol, and drying and calcining obtained solid, wherein residues left after calcination are the target product. The hollow titanium dioxide nanospheres with integral form and high monodispersity and capable of being stored stably are prepared, the grain size of the hollow titanium dioxide nanospheres is uniform and controllable under 100 nm, and the wall thickness of the hollow titanium dioxide nanospheres is uniform and controllable under 10 nm; the whole preparing process is easy to operate and high in controllability and repeatability, the template material is widely available, low in price, low in production cost, safe and environmentally friendly, and the method is suitable for large-scale production.

Description

Technical field [0001] The application belongs to the field of preparing nano microspheres, and particularly relates to a method for preparing ultrafine hollow titanium dioxide nanospheres with a diameter of less than 100 nm. Background technique [0002] As a nano-semiconductor material with high specific surface area and low density, hollow titanium dioxide nanospheres not only have good permeability, adsorption characteristics, high stability, non-toxicity, transparency, photocatalytic properties, etc., especially for nano-sized materials smaller than 100nm. Within the limits, the ultrafine hollow titanium dioxide nanospheres have obvious quantum effects and surface effects. It not only involves physics, chemistry, materials, biology and other disciplines, but also has wide application value and prospects in optoelectronic devices, molecular detection, biomedicine and catalysis, such as biocontrollable drug transportation, disease diagnosis, micro-nano containers , Biological...

AI Technical Summary

Problems solved by technology

However, the traditional hard template method mainly uses materials such as polymers as template materials. Not only does a large amount of organic solvents and catalysts be used in the template preparation process, but also the resulting templates often have agglomeration, which needs to be alleviated by adding a large amount of surfactants. In order to make the shell material well coated, these templates often need additional surface activation, and this method is difficult to obtain titanium dioxide hollow nanospheres below 100nm, with good monodispersity and controllable particle size and wall thickness (J. Am.Chem.Soc., 2005, 3928; Chem., 2006, 749; J.Colloid.Interface Sci., 2006, 370; Langmuir., 2001, 3579.)

Images