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首页> 外文期刊>Chemistry: A European journal >Layer-by-layer assembly of Na_9[EuW_(10)O _(36)]·32 H_2O and layered double hydroxides leading to ordered ultra-thin films: Cooperative effect and orientation effect
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Layer-by-layer assembly of Na_9[EuW_(10)O _(36)]·32 H_2O and layered double hydroxides leading to ordered ultra-thin films: Cooperative effect and orientation effect

机译：Na_9 [EuW_（10）O _（36）]·32 H_2O与层状双氢氧化物的分层组装导致有序超薄膜的形成：协同效应和取向效应

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摘要

Well-ordered, ultra-thin films (UTFs) based on the hybrid assembly of Na_9[EuW_(10)O_(36)]·32 H_2O (denoted as EuW_(10)) and exfoliated MgAl layered double hydroxide (LDH) monolayers have been fabricated by utilising a layer-by-layer (LBL) technique. The assembly process was monitored by UV/Vis absorption and fluorescence spectroscopy measurements to get a stepwise and regular growth of the UTFs upon increasing the deposited cycles. In the resulting (EuW_(10)/LDH) _n UTFs, the intercalation of EuW_(10) anions into LDH monolayers allows the UTFs to retain their optical properties. Meanwhile, LDH monolayers provide EuW_(10) with a confined and protective microenvironment to isolate them from each other between adjacent layers. The UTFs exhibit a periodic, long-range, ordered structure. Anisotropic luminescence spectroscopy measurements show that the (EuW_(10)/LDHs)_n UTFs display well-defined red luminescence with an anisotropy value, r, of about 0.15. Therefore, the cooperative and orientation effects between the host layers and guest anions play significant roles for the improved properties of the (EuW_(10)/LDHs)_n UTFs. This work could benefit the design and fabrication of novel electro-optical devices based on the UTFs of hybrid materials.
机译：基于Na_9 [EuW_（10）O_（36）]·32 H_2O（表示为EuW_（10））和脱落的MgAl层状双氢氧化物（LDH）单层的混合组装的有序超薄膜（UTF）具有通过使用逐层（LBL）技术制造的产品。通过UV / Vis吸收和荧光光谱测量监测组装过程，以在增加沉积周期时逐步且有规律地生长UTF。在所得的（EuW_（10）/ LDH）_n UTF中，将EuW_（10）阴离子插入LDH单层使UTF保留了它们的光学特性。同时，LDH单层为EuW_（10）提供了受限的保护性微环境，使它们在相邻层之间彼此隔离。 UTF具有周期性的，远程的，有序的结构。各向异性发光光谱测量结果显示（EuW_（10）/ LDHs）_n UTF显示清晰的红色发光，其各向异性值r约为0.15。因此，主体层和客体阴离子之间的协同作用和取向效应对于（EuW_（10）/ LDHs）_n UTF的改进性质起着重要作用。这项工作可能有益于基于混合材料UTF的新型电光器件的设计和制造。

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