Nonlinear optical and magnetic properties of BiFeO3 harmonic nanoparticles

Abstract

Enhanced magnetic behavior, exchange bias effect, and dielectric property of BiFeO3 incorporated in (BiFeO3)0.50 (Co0.4Zn0.4Cu0.2 Fe2O4)0.5 nanocomposite AIP Advances 4, 037112 (2014) Second Harmonic Generation (SHG) from BiFeO 3 nanocrystals is investigated for the first time to determine their potential as biomarkers for multiphoton imaging. Nanocrystals are produced by an auto-combustion method with 2-amino-2-hydroxymethyl-propane-1,3-diol as a fuel. Stable colloidal suspensions with mean particle diameters in the range 100-120 nm are then obtained after wet-milling and sonication steps. SHG properties are determined using two complementary experimental techniques, Hyper Rayleigh Scattering and nonlinear polarization microscopy. BiFeO 3 shows a very high second harmonic efficiency with an averaged hdi coefficient of 79 6 12 pm/V. From the nonlinear polarization response of individual nanocrystals, relative values of the independent d ij coefficients are also determined and compared with recent theoretical and experimental studies. Additionally, the particles show a moderate magnetic response, which is attributed to c-Fe 2 O 3 impurities. A combination of high nonlinear optical efficiency and magnetic response within the same particle is of great interest for future bio-imaging and diagnostic applications. V C 2014 AIP Publishing LLC.[http://dx

Cellular uptake and biocompatibility of bismuth ferrite harmonic advanced nanoparticles

“…We have shown recently their potential in the context of advanced non-linear optical imaging. 37 Recently BFO-NP were employed in vitro in a pilot study where they proved to be able to locally induce DNA damages by deep UV generation. 12 The cytotoxicity, haemolytic response and internalization mechanisms evidence here reported for coated BFO-NP suggested good biocompatibility and a great potential Figure 5.…”

Harmonic nanoparticles: noncentrosymmetric metal oxides for nonlinear optics

“…These works were mainly motivated by the specific multiferroics properties of bismuth ferrite. However, in terms of magnetic properties, the response of pure BFO is too weak [34] for being competitive with commonly employed magnetic nanoparticles (e.g. iron oxide NPs) in health-care applications [36].…”

“…Finally BFO nanoparticles have been prepared by different methods including solvent evaporation [32], microwave hydrothermal conditions [33], combustion [34], and decomposition of glyoxylate precursor [35]. These works were mainly motivated by the specific multiferroics properties of bismuth ferrite.…”

“…This approach has been used by several authors, both for orientation retrieval or vice versa for determination of χ (2) tensor elements for a given crystal symmetry. Specifically, in the literature, one can find polarization resolved emission traces for Fe(IO 3 ) 3 [72], BBO [73] KTP [27,28,74], LiNbO 3 [41,75], BaTiO 3 [38,76], ZnO [38], BFO [34]. One remarkable observation, mutual to several of these studies, is that the bulk tensorial elements χ ijk (2) can be safely applied to describe the response of these nanoobjects [37,41], even though for materials less characterized in their macroscopic form some discrepancies are present in the literature [34].…”

Correlation between electrospinning parameters and magnetic properties of BiFeO3 nanofibers

“…For example, in one study [19] values of Ms between 0.4 and 0.09 emu/g for particles between 4 and 40 nm were found, while in another one [20] values of Ms between 1.55 and 0.35 emu/g for particles between 14 and 245 nm were measured. Other studies report Ms of 0.41 emu/g for particle size of 77 nm [24], of 0.04875 emu/g for particles of 43 nm [41] and of 3.5 emu/g for particles between 100-200 nm [42]. All these nanoparticles were practically isolated from each other, with no interface between them, which makes the surface effects more prominent.…”