Layer-by-layer assembly of Na9[EuW10O36]·32H2O and layered double hydroxides leading to ordered ultra-thin films: cooperative effect and orientation effect.
Layer-by-layer assembly of Na9[EuW10O36]·32H2O and layered double hydroxides leading to ordered ultra-thin films: cooperative effect and orientation effect.
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DOI：
10.1002/chem.201101062
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
Junhua Xu;Shen Zhao;Z. Han;Xiaoting Wang;Yu‐Fei Song
中科院分区：
文献类型：
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作者：
Junhua Xu;Shen Zhao;Z. Han;Xiaoting Wang;Yu‐Fei Song
采用逐层法制备了基于Na(9)[EuW(10)O(36)]·32H(2)O(记为EuW(10))和剥离的镁铝层状双氢氧化物(LDH)单分子膜的有序超薄膜。通过UV/Vis吸收光谱和荧光光谱测量来监测组装过程，以获得随着沉积周期的增加而逐步规则地生长的UTF。在所得到的(EuW(10)/LDH)(N)UTF中，EuW(10)阴离子插入LDH单分子层允许UTF保持其光学性质。同时，LDH单分子膜为EuW(10)提供了一个受限和保护的微环境，使它们在相邻的层之间相互隔离。UTF呈现出周期性、长程、有序的结构。各向异性发光光谱测量表明，(EuW(10)/LDHs)(N)UTF表现出良好的红色发光，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和取向效应对(EuW(10)/LDHs)(N)UTF的性能改善起着重要的作用。这项工作对基于杂化材料的UTF的新型电光器件的设计和制造具有一定的参考价值。
Well-ordered, ultra-thin films (UTFs) based on the hybrid assembly of Na(9)[EuW(10)O(36)]·32H(2)O (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.