Annealing Temperature Effect on the Physical Properties of Titanium Oxide Thin Films Prepared by the Sol-Gel Method

Titanium dioxide nanoparticles were successfully synthesized using the hydrothermal method in an autoclave at 100 °C. The onset of the formation of the rutile phase from 400 to 700 °C was investigated through the morphology, structure and thermal properties. X-ray diffractometer and Raman spectroscopy confirmed the formation of a hybrid anatase (A) and rutile (B) phase at 400 °C. The nanoparticles formed spherical structures with an average size between 19.799 and 38.685 nm. Thermogravimetric analysis confirmed that a TiO 2 nanocrystal subjected to higher temperatures undergoes four degradation stages involving the desorption of water molecules, the loss of organic compounds, and the phase change from amorphous to crystalline anatase.

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“…This further indicates that the number of Ti-O-Ti vibrations also increases with the annealing temperature. (46) Fig. 7.…”

Section: Ftir Analysismentioning

confidence: 99%

Transformation from anatase to rutile titania using hydrothermal method: Investigation of morphology and thermal stability

Ntsikelelo¹,

Thembinkosi²,

Koao³

et al. 2020

Sensors and Materials

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“…Структура таких пленок является аморфной сразу после синтеза [11]. Кристаллизация тонких пленок начинается при температурах выше 700 • С, если их отжигать в атмосфере кислорода или на воздухе [12,13]. Такой отжиг оксида титана изменяет фазовый состав, морфологическую структуру и содержание дефектов.…”

Section: Introductionunclassified

Изменение Оптических Свойств Оксида Титана При Кристаллизации

Булярский¹,

Koiva²,

Гусаров³

et al. 2021

Оптика И Спектроскопия

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Crystallization of amorphous titanium oxide films synthesized by magnetron sputtering was carried out at temperatures of 700, 800, and 900 oC in an oxygen atmosphere. The refractive index of the films increases during crystallization with a time constant that depends on temperature, which made it possible to determine the activation energy of the crystallization process on the order of 0.6 eV. The growth kinetics model for the titanium oxide nanocrystals, which is used in this work, showed that the indicated activation energy corresponds to the diffusion energy of oxygen vacancies. This process is decisive for the growth of titanium oxide nanocrystals upon annealing in an oxygen atmosphere. The study of photoluminescence has shown that crystallization leads to a change in the ratio of intensities of different emission bands. The bands that are associated with the oxygen vacancy are extinguished. A decrease in the concentration of these vacancies in films leads to an increase in their resistance and stabilization of the films in time.

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