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Undoped and Cr-doped TiO_2 thin films obtained by spray pyrolysis

机译：喷雾热解法制备未掺杂和Cr掺杂的TiO_2薄膜

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Undoped and chromium doped titanium oxide thin films were fabricated by spray pyrolysis by using a solution of titanium tetrachloride and ethyl alcohol. The films have been deposited on heated glass substrates at 373 K. After annealing for 90 min at 723 K, the initially amorphous films became polycrystalline with a predominant anatase structure and average crystallite sizes depending on dopant (Cr) concentration. The repartition of chromium impurities in the matrix of titanium oxide films, analyzed by electron paramagnetic resonance and X-ray photoelectron spectroscopy showed that the entrance of chromium into the anatase structure is mainly achieved by substitution. A decrease in unit cell parameters ratio (c/a) with the increase of chromium content sustains this assertion. The wetting properties of the titanium oxide films were evaluated from contact angle measurements between de-ionized water and films surface during- and post-irradiation with UV light. The correlation between the concentration of the dopant, film structure, surface morphology and wettability characteristics is discussed.
机译：通过使用四氯化钛和乙醇的溶液进行喷雾热解来制备未掺杂和铬掺杂的氧化钛薄膜。薄膜已在373 K的温度下沉积在加热的玻璃基板上。在723 K的温度下退火90分钟后，最初的无定形薄膜变成具有主要的锐钛矿结构和平均晶体尺寸（取决于掺杂剂（Cr）浓度）的多晶。通过电子顺磁共振和X射线光电子能谱分析，铬杂质在氧化钛膜基质中的重新分配表明，铬进入锐钛矿结构主要是通过取代实现的。随着铬含量的增加，晶胞参数比率（c / a）的降低维持了这一主张。氧化钛膜的润湿性能是通过在紫外线照射过程中和照射后的去离子水与膜表面之间的接触角测量来评估的。讨论了掺杂剂浓度，薄膜结构，表面形态和润湿性之间的关系。

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