Issue 15, 2013

Flexible and transparent free-standing films with enhanced magnetic and luminescent anisotropy

Abstract

Flexible and robust free-standing films are fabricated via layer-by-layer (LBL) assembly of layered double hydroxide (LDH) nanoplatelets, poly(vinyl alcohol) (PVA) and a styrylbiphenyl derivative (BTBS), and show enhanced magnetic and luminescent anisotropy simultaneously. UV-vis absorption and fluorescence spectra demonstrate a stepwise and regular growth of the films upon increasing the number of deposition cycles. XRD, AFM and SEM indicate that the films possess a periodic layered and uniform surface morphology. In contrast to the disordered LDH/PVA/BTBS film prepared by a solvent evaporation method, the (LDH/PVA/LDH/BTBS)n films with ordered structures exhibit enhanced magnetic and optical properties, including higher saturation magnetization, longer luminescence lifetime and stronger polarized photoemission. Moreover, owing to the highly arrayed 2D-organized structure formed through LBL assembly, the presence of the free-standing film means that the alignment of the spins of the LDH nanoplatelets in random directions is avoided and imparts a high level of dispersion and orientation to the BTBS, which displays enhanced magnetic and luminescent anisotropy. Therefore, this work provides a facile method for the fabrication of anisotropic 2D-organized materials based on the LDH/PVA/LDH/BTBS system, which can be potentially used in magneto-optical sensors, magnetic data storage and magneto-resistive devices.

Graphical abstract: Flexible and transparent free-standing films with enhanced magnetic and luminescent anisotropy

Supplementary files

Article information

Article type
Paper
Submitted
29 Dec 2012
Accepted
07 Feb 2013
First published
07 Feb 2013

J. Mater. Chem. A, 2013,1, 4786-4792

Flexible and transparent free-standing films with enhanced magnetic and luminescent anisotropy

Y. Dou, X. Liu, M. Shao, J. Han and M. Wei, J. Mater. Chem. A, 2013, 1, 4786 DOI: 10.1039/C3TA01674A

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