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Size-modulation of functionalized Fe3O4: Nanoscopic customization to devise resolute piezoelectric nanocomposites


Magnetite (Fe3O4), an archetypical relaxor multiferroic material, transpires to possess fundamentally appealing multifaceted size-dependent properties. To appraise such a prototype spinel transition metal oxide (STMO); monodispersed and highly water-dispersible spherical magnetite nanoparticles (MNPs) with enormous variation in size (3.7 – 242.8 nm) are synthesized by a persuadable microwave-assisted and polyol-mediated solvothermal approach at controlled temperature and pressure, using idiosyncratic crystallite growth inhibitors. An exalted long-term colloidal stability in polar environment and Zeta potential insurgence conform the coordinative effect of carboxylate groups contriving the covalent surface functionalization; duly validated from FTIR spectra, TGA and XPS analysis. The optical band-gap (Eg) between crystal-field split-off bands, calculated from absorption spectra, increases gradually against size-contraction enfolding a broad UV-Vis range (1.59-4.92 eV). Red-shifting of asymmetric Raman peaks with smaller size and short-range electron-phonon coupling are explained from the modified phonon confinement model (MPCM); whereas ferrimagnetic nature rejigged by superparamagnetism is verified from Mössbauer analysis. These stoichiometric, non-toxic, polar and magnetic nanocrystals are not only ideal for biomedical applications, but also compliant with electroactive porous host-networks. Size-modulated MNPs are finally incorporated in poly(vinylidene floride) [PVDF] based polytype nanogenerators as an electret filler to reinforce piezoelectric performance (VOC~115.95 V, ISC~1.04 μA), accompanied by substantial electromagnetic interference shielding.

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Article information

27 Mar 2020
14 May 2020
First published
14 May 2020

Dalton Trans., 2020, Accepted Manuscript
Article type

Size-modulation of functionalized Fe3O4: Nanoscopic customization to devise resolute piezoelectric nanocomposites

S. Bhattacharjee, N. Mazumder, S. Mondal, K. Panigrahi, A. Banerjee, D. Das, S. Sarkar, D. Roy and K. K. Chattopadhyay, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/D0DT01167C

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