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Synthesis and magnetic properties of organic multilayer films based on the layer‐by‐layer assembly
Author(s) -
Luo Jin,
Wang Yanhua,
Ren Rong,
Sun Weilin,
Shen Zhiquan
Publication year - 2015
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3438
Subject(s) - materials science , paramagnetism , polymer , ferromagnetism , layer by layer , layer (electronics) , fourier transform infrared spectroscopy , substrate (aquarium) , polyelectrolyte , polymerization , infrared spectroscopy , magnetic field , infrared , nanotechnology , chemical engineering , condensed matter physics , composite material , optics , organic chemistry , chemistry , oceanography , physics , quantum mechanics , geology , engineering
Two polymers containing pyridine rings were prepared by free‐radical polymerization and confirmed by Fourier transform infrared and 1 H NMR spectra. The preparation of four multilayer films that were obtained by self‐assembly of the polymer and the transition metal neutralized polyelectrolyte on PE substrate was described. UV–vis spectra and atomic force microscopy images were applied to characterize these films and indicate the uniform assembling process. The driving force for building up the multilayer films was identified by infrared spectroscopy to be the coordination interaction. The magnetic behavior was examined as a function of magnetic field strength at 30 kOe and as a function of temperature (5–300 K). All films display strong soft ferromagnetic properties and higher than those of the bulk materials. The magnetic results show that the layer‐by‐layer self‐assembling approach is beneficial to the ordered alignment of adjacent paramagnetic spins and induces better magnetic phenomena. Copyright © 2015 John Wiley & Sons, Ltd.