Anatase Titanium Dioxide Crystallization by a Hydrolysis Reaction of Titanium Alkoxide without Annealing

Abstract

The crystallization of anatase titanium dioxide (TiO2) was achieved by a hydrolysis reaction of titanium alkoxide without annealing. The hydrolysis reaction rates of tetraethyl orthotitanate were indicated by a function of the concentration of acetylacetone added. The degree of crystallinity of the product particles was influenced by the amounts of acetylacetone and seed crystals. Anatase TiO2 was crystallized by restraining the rapid increase in supersaturation of TiO2 and the consequent nucleation of amorphous TiO2. The degree of crystallinity of the product particles also changed with the types of seed crystals used, and was strongly influenced by the specific surface areas of the seed crystals.

Biomimetic Random Lasers with Tunable Spatial and Temporal Coherence

“…Such small crystal sizes are typically obtained from TEOT-based precursor solutions. [32,33] In our work, this means that the crystal domains are small enough to provide a detailed replica of the paper template, confirming our observations by SEM.…”

Effect of seed particles on crystallization and crystallite size of anatase TiO2 nanocrystals by solvothermal treatment

“…In comparison, phase transformation from the amorphous TiO 2 to the crystalline or partially crystalline, anatase nano-framework in solutions has received less attention [11][12][13], despite a clear importance of preparing phase-pure anatase nanocrystals at a favorably reduced temperature together with a tailored pore/grain morphology from both technological and environmental viewpoints [14,15]. Use of crystalline seed to facilitate the crystallization of anatase TiO 2 from the amorphous phase in particular has been carried out when nanoparticles [16][17][18][19][20][21], nanotapes/ nanowires [22,23], and thin films [24][25][26] are of interest. Effect of the TiO 2 seeding to the crystallization temperature varies yet considerably, resulting primarily from the interplay between the crystallization and grain growth of the anatase phase in the presence of liquid solution or air atmosphere.…”

Preparation of a Superhydrophilic Thin Film on Glass Substrate Surfaces with Titanium Alkoxide Solution

“…In sol-gel methods, acetylacetone is added in order to decelerate the reaction rates of titanium alkoxide hydrolysis. 19 In the present study, very small amorphous TiO 2 suspended in the solution were deposited on the SiO 2 -coated slide glass substrate surfaces. Consequently, a large number of amorphous TiO 2 , which is metastable compared with anatase TiO 2 , were nucleated in the solution in the initial stages of TEOT hydrolysis operations.…”

“…Therefore, the supersaturations of TiO 2 in the later stages of TEOT hydrolysis operations were low. 19 In the present study, very small amorphous TiO 2 suspended in the solution were deposited on the SiO 2 -coated slide glass substrate surfaces. The amorphous TiO 2 suspended in the solution would adhere onto the surfaces and would grow in the solution during the experiments.…”