Method for preparing titanium dioxide quantum dots by ultrasonication

Abstract

The invention discloses a method for preparing titanium dioxide quantum dots by ultrasonication. The method is characterized in that titanium dioxide quantum dots are obtained by using a titanium dioxide precursor powder as a raw material and subjecting the titanium dioxide precursor powder to liquid nitrogen freeze embrittlement treatment and ultrasonication treatment. Aiming at the fact that theraw material is a titanium dioxide precursor powder with different morphologies and organization structures, the method of the invention realizes preparation of the quantum dots by liquid nitrogen ultra-low temperature freeze embrittlement treatment and ultrasonication treatment, and the process does not need complicated chemical modification and post treatment. The prepared quantum dots are in eigenstate. The preparation process is simple, the equipment requirements are low, operation is convenient and the cost is low, and therefore the method is beneficial to batch preparation of the titanium dioxide quantum dots.

Description

technical field [0001] The invention belongs to the technical field of low-dimensional nanometer materials, and in particular relates to a method for preparing titanium dioxide quantum dots by ultrasonic crushing. Background technique [0002] So far, titanium dioxide is the most widely studied, in-depth and most valuable material in the field of photocatalysis. It has shown excellent performance in photolysis of water to hydrogen production, photocatalytic degradation, and photocatalytic synthesis. In recent years, quantum dots have attracted extensive attention and research because of their quantum size effect, surface effect, variable emission spectrum and good photostability. In the existing reports, the preparation methods of titanium dioxide quantum dots include sol-gel method, metal-organic chemical vapor deposition method and hydrothermal synthesis method. The sol-gel method uses a solvent containing a titanium source and a compound with a highly chemically active c...

AI Technical Summary

Problems solved by technology

The sol-gel method uses a solvent containing a titanium source and a compound with a highly chemically active component as a precursor, and then allows these raw materials to be uniformly mixed in a liquid phase, and then hydrolyzed, condensed, aged, dried, and sintered to make titanium dioxide. Quantum dots, the cost of raw materials used in this method is high, mostly complex organic substances, which are potentially dangerous to human health, and the preparation cycle is long; metal organic chemical vapor deposition method uses carrier gas to bring organic compounds containing titanium into the reaction The chamber is mixed with other gases, and then a chemical reaction occurs on the heated substrate to prepare titanium dioxide quantum dots. This method requires high equipment and raw materials, and the waste gas after the reaction pollutes the environment. The preparation process is complicated; the hydrothermal synthesis method is to The solvent containing titanium source and other active solvents are placed in a sealed container, and titanium dioxide quantum dots are prepared after high temperature and high pressure, separation, washing and drying. This method has high requirements on raw materials and preparation environment, and it is difficult to achieve large-scale production

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