Structural properties of TiO2 nanocrystallites condensed in vapor-phase for photocatalyst applications
Structural properties of TiO2 nanocrystallites condensed in vapor-phase for photocatalyst applications
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DOI：
10.1007/s00339-014-8378-3
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Takehito Yoshida;N. Yagi;Riki Nakagou;A. Sugimura;I. Umezu
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文献类型：
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作者：
Takehito Yoshida;N. Yagi;Riki Nakagou;A. Sugimura;I. Umezu
我们采用脉冲激光烧蚀法在氧气背景气体中合成了二氧化钛纳米晶。改变O2背景气体压力或衬底靶距离（λ），可以将λ/金红石混合物中的λ相的重量分数从0.2改变到1.0。沉积的TiO 2薄膜的孔隙率随沉积温度的升高而增大。从汽相冷却过程的角度解释了工艺参数与晶相形成的关系。此外，快速热退火（RTA）进行后退火，抑制烧结的纳米微晶。TiO 2纳米晶的光催化活性取决于RTA温度和随后的结晶度恢复以及晶相：金红石或金红石。
We have synthesized titanium dioxide (TiO2) nanocrystallites by pulsed laser ablation (PLA) in oxygen (O2) background gas for photocatalyst applications. Varying O2background gas pressureor substrate target distance (DTS), it was possible to change weight fraction of anatase phase in the anatase/rutile mixture from 0.2 to 1.0. Porosity of the deposited TiO2films increased with increasingandDTS. Relation between the process parameters and the formed crystal phases was explained from the point of cooling process in vapor-phase. Furthermore, rapid thermal annealing (RTA) was performed as post-annealing, suppressing sintering of the nanocrystallites. Photocatalytic activities of the TiO2nanocrystallites depended on the RTA temperature and following crystallinity restoring as well as the crystal phase: anatase or rutile.