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首页> 外文会议>Symposium on Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures Dec 2-6, 2002 Boston, Massachusetts, U.S.A. >SURFACE MODIFICATION AND OPTICAL BEHAVIOR OF TIO_2 NANOSTRUCTURES
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SURFACE MODIFICATION AND OPTICAL BEHAVIOR OF TIO_2 NANOSTRUCTURES

机译：TIO_2纳米结构的表面修饰和光学行为

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摘要

TiO_2 is a very important material from the perspective of photocatalytic applications, but due to its 3.2 eV bandgap, it is not possible to make this material efficient under visible illumination. Anatase TiO_2 nanoclusters in the 3―30 nm range have been formed by a wet chemical technique and surface modified in order to enhance the absorption of visible light. Nitridation of the highly reactive TiO_2 nanosphere surface has been achieved by a quick and simple treatment in alkyl ammonium compounds and the metallization of this surface has been achieved by electroless plating. Although the structure of the resultant material remains anatase, some of the treated material exhibits strong emission between 550-560 nm, which red shifts and drops in intensity with aging in the atmosphere. Electron Spin Resonance performed on these samples identify a resonance at g=2.0035, which increases significantly with the nitridation step. This resonance is attributed to an oxygen hole center created near the surface of the nanoclusters, which correlates well the noted optical activity.
机译：从光催化应用的角度来看，TiO_2是一种非常重要的材料，但是由于其3.2 eV的带隙，在可见光下不可能使这种材料有效。已经通过湿化学技术形成了3〜30 nm范围的锐钛矿型TiO_2纳米团簇，并对其表面进行了改性，以增强对可见光的吸收。高反应性TiO_2纳米球表面的氮化已通过在烷基铵化合物中进行快速简单的处理而实现，并且该表面的金属化已通过化学镀实现。尽管所得材料的结构保持为锐钛矿型，但某些经处理的材料在550-560 nm之间显示出强发射，随着大气老化，红移并强度下降。在这些样品上执行的电子自旋共振确定了在g = 2.0035处的共振，该共振随氮化步骤显着增加。该共振归因于在纳米团簇的表面附近产生的氧孔中心，该氧孔中心与所述光学活性很好地相关。

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