abstract
A new approach for the synthesis of Prussian blue type nanoparticles containing nanocomposites in the form of beads or films, as well as their corresponding aqueous colloids, was developed by using a water-soluble alginate matrix as a template and as a stabilizing agent. This method consists of the step-by-step building of a cyanometallate network in the pores of Mn+/alginate ionotropic gels in order to obtain a large range of nanocomposites containing cyano-bridged coordination polymer nanoparticles Mn+/[M'(CN)(m)](3-)/alginate (where Mn+ = Ni2+, Cu2+, Mn2+, Fe2+, Eu3+ and M' = Fe3+, Cr3+ (m = 6), Mo5+ (m = 8)). The nanocomposite beads and films, as well as the corresponding aqueous colloidal solutions, were studied by infrared (IR), UV/visible spectroscopy, and transmission electron microscopy (TEM) analyses, which reveal the presence of homogeneously dispersed uniformly sized cyano-bridged coordination polymer nanoparticles of 3-7 nm. These nanocomposite beads and films present superparamagnetic, spin-glass or paramagnetic behaviour depending on the nature of the metal ions used. In addition, the Eu3+-containing nanocomposites are room temperature optically active emitters displaying a characteristic D-5(0) -> F-7(0-4) transition.
keywords
COORDINATION POLYMER NANOPARTICLES; MAGNETIC-ORDERING TEMPERATURE; MOLECULAR-BASED MAGNETS; THIN-FILMS; MULTIFUNCTIONAL MATERIALS; MESOPOROUS SILICA; ULTRATHIN FILMS; DRUG-DELIVERY; IONIC LIQUIDS; DEGREES-C
subject category
Chemistry; Materials Science
authors
Tokarev, A; Agulhon, P; Long, J; Quignard, F; Robitzer, M; Ferreira, RAS; Carlos, LD; Larionova, J; Guerin, C; Guari, Y
our authors
Luís Carlos
Full professor
Maria Rute de Amorim e Sá Ferreira André
Full professoracknowledgements
The authors thank Mrs Corine Reibel (PAC ICGM, Montpellier, France) for magnetic measurements and Mr Didier Cot (IEMM, Montpellier, France) for SEM imaging. The authors thank University of Montpellier 2, CNRS, ANR 2010 Blan716 1 and CNano-GSO for financial support.