Photochemical activity of nitrogen-doped rutile TiO2(111) in visible light
Photochemical activity of nitrogen-doped rutile TiO2(111) in visible light
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DOI：
10.1021/jp031267y
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发表时间：
2004-05-13
影响因子：
3.3
通讯作者：
Yates, JT
中科院分区：
文献类型：
--
作者：
Diwald, O;Thompson, TL;Yates, JT
已经发现，在870 K下通过NH3处理用氮掺杂的TiO 2（110）单晶在低至2.4 eV的光子能量下表现出光活性，这比金红石TiO 2的带隙能量低0.6 eV。负责该效应的间隙氮的活性掺杂剂状态表现出399.6eV的N（Is）结合能，并且是由于可能与氢结合的氮的形式，其不同于具有396.7eV的N（Is）结合能的替代氮化物状态。光学吸收测量还显示，对于NH3处理的TiO 2（110），吸收增强至2.4 eV。氮和氢之间的共掺杂效应被假定为负责氮掺杂的TiO2材料在可见光范围内的增强的光活性。
TiO2 (110) single crystals, doped with nitrogen via an NH3 treatment at 870 K, have been found to exhibit photoactivity at photon energies down to 2.4 eV, which is 0.6 eV below the band-gap energy for rutile TiO2. The active dopant state of the interstitial nitrogen that is responsible for this effect exhibits an N (Is) binding energy of 399.6 eV and is due to a form of nitrogen that is probably bound to hydrogen, which differs from the substitutional nitride state with an N (Is) binding energy of 396.7 eV. Optical absorption measurements also show enhanced absorption down to 2.4 eV for the NH3-treated TiO2 (110). A co-doping effect between nitrogen and hydrogen is postulated to be responsible for the enhanced photoactivity of nitrogen-doped TiO2 materials in the range of visible light.