Ordered Blue Luminescent Ultrathin Films by the Effective Coassembly of Tris(8-hydroxyquinolate-5-sulfonate)aluminum and Polyanions with Layered Double Hydroxides

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• 作者：Shuangde Li ; Jun Lu ; Hongkai Ma ; Jing Xu ; Dongpeng Yan ; Min Wei ; David G. Evans ; Xue Duan
• 刊名：Langmuir
• 出版年：2011
• 出版时间：September 20, 2011
• 年：2011
• 卷：27
• 期：18
• 页码：11501-11507
• 全文大小：938K
• 年卷期：v.27,no.18(September 20, 2011)
• ISSN：1520-5827

文摘

This article reports a novel method to assemble a small anion with exfoliated Mg鈥揂l-layered double hydroxide (LDH) nanosheets into ordered ultrathin films (UTFs) by employing the layer-by-layer assembly technique. The premixing solution of tris(8-hydroxyquinolate-5-sulfonate)aluminum(III) (AQS^{3鈥?/sup>) with three kinds of polyanions鈥攑oly(acrylic acid), ((C₃H₄O₂)_n, PAA), poly(styrene 4-sulfonate) ([CH₂CH(C₆H₄)SO₃]_m, PSS), and poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylene vinylene] (C₁₂H₁₃O₅S)_n, PPV)鈥攈as been used as building blocks to assemble alternatively with LDH nanosheets. The UV鈥搗is absorption and fluorescence spectroscopy of (AQS-polyanion/LDH)_n UTFs presents stepwise growth upon increasing deposited cycles in comparison with the (AQS/LDH)_n film under the same experimental process. (AQS-PPV/LDH)_n UTF displays complex fluorescence originating from AQS and PPV. The (AQS/LDH)_n and (AQS-polyanion/LDH)_n UTFs exhibit higher blue-polarized photoemission character with a luminescence anisotropy (r) of ca. 0.12鈥?.20 and a longer fluorescence lifetime than that of the Na₃AQS film with r = 0.04. X-ray diffraction, scanning electron microscopy, and atomic force microscopy demonstrated that the UTFs were orderly periodically layered structures with a thickness of ca. 3.0 nm per bilayer. Therefore, this work gives a feasible method for immobilizing small anions into the gallery of LDHs.}