Shell-mediated control of surface chemistry of highly stoichiometric magnetite nanoparticles

Lavorato, Gabriel C.; Rubert, Aldo A.; Xing, Yutao; Das, Raja; Robles, Joshua; Litterst, F. Jochen; Baggio-Saitovitch, Elisa; Phan, Manh-Huong; Srikanth, Hariharan; Vericat, Carolina; Fonticelli, Mariano H.

doi:10.1039/d0nr02069a

Title: Shell-mediated control of surface chemistry of highly stoichiometric magnetite nanoparticles

Journal Article · Fri Jun 19 00:00:00 EDT 2020 · Nanoscale

DOI:https://doi.org/10.1039/d0nr02069a· OSTI ID:1800502

^[1];

^[1]; Xing, Yutao ^[2]; Das, Raja ^[3]; Robles, Joshua ^[4]; Litterst, F. Jochen ^[5]; Baggio-Saitovitch, Elisa ^[6];

^[4];

^[1];

^[1]

Universidad Nacional de La Plata (Argentina). Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA)
Universidade Federal Fluminense, Niterói (Brasil). Centro de Caracterização Avançada para Indústria de Petróleo (LaMAR/CAIPE)
Phenikaa University, Hanoi (Vietnam). Phenikaa Research and Technology Institute (PRATI)
Univ. of South Florida, Tampa, FL (United States)
Braunschweig Univ. of Technology (Germany)
Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro (Brasil)

Magnetite (Fe₃O₄) nanoparticles are one of the most studied nanomaterials for different nanotechnological and biomedical applications. However, Fe₃O₄ nanomaterials gradually oxidize to maghemite (γ-Fe₂O₃) under conventional environmental conditions leading to changes in their functional properties that determine their performance in many applications. Here we propose a novel strategy to control the surface chemistry of monodisperse 12 nm magnetite nanoparticles by means of a 3 nm-thick Zn-ferrite epitaxial coating in core/shell nanostructures. We have carried out a combined Mössbauer spectroscopy, dc magnetometry, X-ray photoelectron spectroscopy and spatially resolved electron energy loss spectroscopy study on iron oxide and Fe₃O₄/Zn_0.6Fe_2.4O₄ core/shell nanoparticles aged under ambient conditions for 6 months. Our results reveal that while the aged iron oxide nanoparticles consist of a mixture of γ-Fe₂O₃ and Fe₃O₄, the Zn-ferrite-coating preserves a highly stoichiometric Fe₃O₄ core. Therefore, the aged core/shell nanoparticles present a sharp Verwey transition, an increased saturation magnetization and the possibility of tuning the effective anisotropy through exchange-coupling at the core/shell interface. The inhibition of the oxidation of the Fe₃O₄ cores can be accounted for in terms of the chemical nature of the shell layer and an epitaxial crystal symmetry matching between the core and the shell.

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Research Organization:: Univ. of South Florida, Tampa, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46438

OSTI ID:: 1800502

Alternate ID(s):: OSTI ID: 1633936

Journal Information:: Nanoscale, Vol. 12, Issue 25; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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