Photoinduced Formation of Defects and Nitrogen Stabilization of Color Centers in N-Doped Titanium Dioxide
Photoinduced Formation of Defects and Nitrogen Stabilization of Color Centers in N-Doped Titanium Dioxide
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DOI：
10.1021/jp071181v
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发表时间：
2007-07
影响因子：
3.7
通讯作者：
A. Emeline;N. Sheremetyeva;N. V. Khomchenko;V. Ryabchuk;N. Serpone
中科院分区：
文献类型：
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作者：
A. Emeline;N. Sheremetyeva;N. V. Khomchenko;V. Ryabchuk;N. Serpone
第二代光催化剂基于金属氧化物TiO 2并掺杂有各种阴离子（例如，N、S和C）和阳离子的光催化活性最近已经成为严格审查的对象，这是由于TiO 2的吸收边向较长波长的红移，从而相对于仅能吸收UV辐射的原始未掺杂TiO 2，基于吸收的总UV和可见光增加了光催化效率。本文探讨了光学行为（漫反射光谱）的氮掺杂的二氧化钛试样，并探讨了光致缺陷的形成时，N掺杂的试样进行氧化（O2）和还原（H2）应力相对于真空。N掺杂的TiO 2的可见光谱区域（400 nm < λ < 900 nm）中的所得吸收光谱由重叠的单个吸收带组成，每个吸收带反映了组成色心的吸收。这些色心（Ti 3+中心）的形成和积累的动力学进行了评估。埃尔...
Second-generation photocatalysts based on the metal oxide TiO2 and doped with various anions (e.g., N, S, and C) and cations have recently been the object of intense scrutiny as a result of the red-shift of the absorption edge of TiO2 to longer wavelengths, thereby increasing the photocatalytic efficacy based on total UV and visible light absorbed relative to pristine nondoped TiO2 which can only absorb UV radiation. This article examines the optical behavior (diffuse reflectance spectroscopy) of a nitrogen-doped TiO2 specimen and explores the photoinduced formation of defects when the N-doped specimen is subjected to oxidative (O2) and reductive (H2) stresses relative to vacuum. The resulting absorption spectrum in the visible spectral region (400 nm < λ < 900 nm) of the N-doped TiO2 consists of overlapping single absorption bands, each one of which reflects absorption by the constituent color centers. Kinetics of formation and accumulation of these color centers (Ti3+ centers) have been assessed. The el...