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This content will become publicly available on July 23, 2018

Title: Spinel Ferrite Core–Shell Nanostructures by a Versatile Solvothermal Seed-Mediated Growth Approach and Study of Their Nanointerfaces

An easy, low-cost, repeatable seed-mediated growth approach in solvothermal condition has been proposed to synthesize bimagnetic spinel ferrite core–shell heterostructures in the 10–20 nm particle size range. Cobalt ferrite and manganese ferrite nanoparticles (CoFe 2O 4 and MnFe 2O 4) have been coated with isostructural spinel ferrites like maghemite/magnetite, MnFe 2O 4, and CoFe 2O 4 with similar cell parameters to create different heterostructures. The conventional study of the structure, morphology, and composition has been combined with advanced techniques in order to achieve details on the interface at the nanoscale level. Clear evidence of the heterostructure formation have been obtained (i) indirectly by comparing the 57Fe Mössbauer spectra of the core–shell samples and an ad hoc mechanical mixture and (ii) directly by mapping the nanoparticles’ chemical composition by electron energy loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDX) in the scanning transmission electron microscopy mode (STEM). Additionally, chemical-sensitive electron tomography in STEM-EDX mode has been applied in order to obtain detailed 3D images with a sub-nanometer spatial resolution.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ; ORCiD logo [2]
  1. Univ. di Cagliari, Monserrato (Italy); INSTM, Firenze (Italy)
  2. Univ. di Cagliari, Monserrato (Italy); INSTM, Firenze (Italy); Consorzio AUSI, Iglesias (Italy)
  3. Charles Univ. of Prague, Stare Mesto (Czech Republic); AS CR, Husinec Rez (Czech Republic)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-114567-2017-JA
Journal ID: ISSN 1936-0851; R&D Project: 16060; 16060
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 11; Journal Issue: 8; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; tomography; Center for Functional Nanomaterials; core−shell; EDX; EELS; ferrite; Mössbauer; solvothermal
OSTI Identifier:
1409515