Optically Active Nanostructured ZnO Films
Optically Active Nanostructured ZnO Films
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光学活性纳米结构 ZnO 薄膜
DOI：
10.1002/anie.201507502
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发表时间：
2015-12-07
影响因子：
16.6
通讯作者：
Che, Shunai
中科院分区：
文献类型：
--
作者：
Duan, Yingying;Han, Lu;Che, Shunai
具有层次化手性的无机纳米材料因其独特的性质，有望在物理理论和应用领域开辟新的天地。在这里，我们报道了在具有从原子到微米尺度的分级纳米结构的石英衬底上涂覆的手性氧化锌薄膜。在氧化锌薄膜中存在三个层次的手性：形成一次螺旋盘状纳米板的螺旋状的氧化锌晶体结构，这些纳米板的二次螺旋堆积，以及由几个堆叠的纳米板形成的三级纳米尺度的环状聚集体。这些薄膜在380 nm和200-800 nm范围内表现出光学活性，并在510 nm处产生圆偏振发光，在50-1400 cm(-1)处产生拉曼散射，这归因于电子跃迁、散射、光致发光和不对称电场中的拉曼散射。这种前所未有的强光吸收可以归因于层次化结构中的多次光散射和吸收增强的光收集。
Inorganic nanomaterials endowed with hierarchical chirality could open new horizons in physical theory and applications because of their fascinating properties. Here, we report chiral ZnO films coated on quartz substrates with a hierarchical nanostructure ranging from atomic to micrometer scale. Three levels of hierarchical chirality exist in the ZnO films: helical ZnO crystalline structures that form primary helically coiled nanoplates, secondary helical stacking of these nanoplates, and tertiary nanoscale circinate aggregates formed by several stacked nanoplates. These films exhibited optical activity (OA) at 380 nm and in the range of 200-800 nm and created circularly polarized luminescence centered at 510 nm and Raman OA at 50-1400 cm(-1), which was attributed to electronic transitions, scattering, photoluminescent emission, and Raman scattering in a dissymmetric electric field. The unprecedented strong OA could be attributed to multiple light scattering and absorption-enhanced light harvesting in the hierarchical structures.