Water-assisted crystallization and densification of sol?gel-derived TiO<sub>2</sub> films during low-temperature heating
Water-assisted crystallization and densification of sol?gel-derived TiO<sub>2</sub> films during low-temperature heating
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溶胶凝胶法TiO<sub>2</sub>薄膜低温水辅助结晶致密化
DOI：
10.1080/21870764.2022.2039347
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发表时间：
2022
影响因子：
2.3
通讯作者：
Bando Takahiro
中科院分区：
文献类型：
--
作者：
Uchiyama Hiroaki;Bando Takahiro
研究了溶胶-凝胶涂层在400℃以下加热时tio2薄膜的结晶和致密化行为，并讨论了前驱体溶液中H2O含量对锐钛矿在400℃以下低温下成核和晶体生长的影响。采用Ti(OC3H7i)4:HNO3:H2O:C2H5OH溶液制备tio2凝胶膜，在空气中200-400℃加热10 min-6 h，其中H2O/Ti(OC3H7i)4摩尔比(x)在1.0 ~ 8.0之间变化。H2O含量对热处理tio2薄膜的结晶程度和晶粒尺寸影响不显著，但表面结构随浓度的增加而致密。在300 ~ 400℃下加热6 h， x= 8.0的致密tio2薄膜的折射率为2.22 ~ 2.25，高于在800℃下加热x= 1.0的致密tio2薄膜。
The crystallization and densification behavior of TiO2films during heating at below 400°C was studied for sol–gel coatings and the effect of the H2O content in the precursor solutions on the nucleation and crystal growth of anatase at such relatively low temperature was discussed. TiO2gel films were prepared from Ti(OC3H7i)4:HNO3:H2O:C2H5OH solutions, followed by heating at 200–400°C for 10 min–6 h in air, where the H2O/Ti(OC3H7i)4mole ratio (x) was varied from 1.0 to 8.0. The degree of crystallization and the crystallite size of the heat-treated TiO2films were not significantly affected by the H2O content, while the surface structure became denser with an increase inx. The dense TiO2films ofx= 8.0 heated at 300–400°C for 6 h exhibited a refractive index of 2.22–2.25, which was higher than that ofx= 1.0 heated at 800°C.