Photocatalytic chemisorption of water on titanium dioxide thin films obtained by radio frequency magnetron deposition
Photocatalytic chemisorption of water on titanium dioxide thin films obtained by radio frequency magnetron deposition
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DOI：
10.1016/j.apsusc.2004.10.097
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发表时间：
2005-05
影响因子：
6.7
通讯作者：
L. Sirghi;Y. Hatanaka;T. Aoki
中科院分区：
文献类型：
--
作者：
L. Sirghi;Y. Hatanaka;T. Aoki
通过光电流衰减实验研究了水在二氧化钛（TiO 2）薄膜上的光催化化学吸附。采用射频磁控溅射法在石英衬底上制备了TiO 2薄膜。在真空（10 - 2 Torr）下，光催化活性好的薄膜比光催化活性低的薄膜具有更大的感应光电流强度和更长的载流子寿命。良好的光催化膜暴露于水-氩气混合气体在大气压下的光电流衰减强烈依赖于气体湿度，较大的衰减率被观察到在较大的湿度值。由于氧的化学吸附，在空气中的光电流衰减速率大于在相同湿度的水-氩气中。
The photocatalytic chemisorption of water on titanium dioxide (TiO2) thin films was studied by photocurrent decay experiments on the films exposed to water vapour. The TiO2films were deposited on quartz substrates by sputtering of a high purity TiO2target in a radio frequency magnetron discharge in argon–oxygen gas. In vacuum (10−2Torr), the films with good photocatalytic activity had large induced photocurrent intensity and long electrical charge carrier lifetime, when compared to the films with low photocatalytic activity. The photocurrent decay in good photocatalytic films exposed to water–argon gas mixture at atmospheric pressure depended strongly on the gas humidity, larger decay rates being observed at larger humidity values. Because of the oxygen chemisorption, the photocurrent decay rates were larger in air than in the same humidity water–argon gas.