The Influence of the Dipolar Field Effect on the Photochemical Reactivity of Sr2Nb2O7 and BaTiO3 Microcrystals
The Influence of the Dipolar Field Effect on the Photochemical Reactivity of Sr2Nb2O7 and BaTiO3 Microcrystals
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DOI：
10.1007/s11244-008-9067-2
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发表时间：
2008-05
影响因子：
3.6
通讯作者：
J. Giocondi;G. Rohrer
中科院分区：
文献类型：
--
作者：
J. Giocondi;G. Rohrer
先前已经表明，偶极场效应在空间上将光化学反应产物定位在宏观铁电晶体的表面上。本文利用光化学反应在BaTiO_3和Sr_2Nb_2O_7微晶表面形成不溶物存款的方法研究了它们的偶极场效应。在这两种情况下，表面上的还原银的图案与样品内的铁电畴的取向一致。结果表明，偶极场与小颗粒中的铁电畴相关联，可以分离光生载流子并使反应产物在空间上局域化。
It has previously been shown that the dipolar field effect spatially localizes photochemical reaction products on the surfaces of macroscopic ferroelectric crystals. In this work, photochemical reactions that deposit insoluble products on the surface have been used to study the dipolar field effect in microcrystals of BaTiO3and Sr2Nb2O7. In both cases, the patterns of reduced silver on the surface were consistent with the orientations of the ferroelectric domains within the samples. The results show that dipolar fields associated with the ferroelectric domains in small particles can separate photogenerated charge carriers and spatially localize reaction products.