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Layer‐by‐Layer Assembly of Na 9 [EuW 10 O 36 ]⋅32 H 2 O and Layered Double Hydroxides Leading to Ordered Ultra‐Thin Films: Cooperative Effect and Orientation Effect
Author(s) -
Xu Junhua,
Zhao Shen,
Han Zhenzhen,
Wang Xiaoting,
Song YuFei
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201101062
Subject(s) - monolayer , layered double hydroxides , materials science , luminescence , hydroxide , layer by layer , anisotropy , intercalation (chemistry) , spectroscopy , fabrication , layer (electronics) , absorption (acoustics) , fluorescence spectroscopy , chemical engineering , nanotechnology , fluorescence , optoelectronics , chemistry , inorganic chemistry , optics , composite material , medicine , physics , alternative medicine , quantum mechanics , pathology , engineering
Well‐ordered, ultra‐thin films (UTFs) based on the hybrid assembly of Na 9 [EuW 10 O 36 ] ⋅ 32 H 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.