Mössbauer studies of core-single-shell and core-double-shell polymer functionalized magnetic nanoparticles

Two different magnetic core–shell nanohybrids, i) single coated magnetic nanoparticles (NPs) with polyacrylonitrile (PAN) and ii) doubly coated with SiO 2 and polyaniline (PANI), were synthesized by a modified chemical co-precipitation method and their structural, vibrational, colloidal, and magneti...

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Bibliographic Details
Published in:Hyperfine interactions 2022-12, Vol.243 (1), Article 27
Main Authors: Rueda-Vellasmin, Renzo, Checca-Huaman, Noemi-Raquel, Passamani, Edson C., Litterst, F. Jochen, Ramos-Guivar, Juan A.
Format: Article
Language:English
Subjects:
Atomic
Chemical precipitation
Chemical synthesis
Condensed Matter Physics
Control surfaces
Ferric oxide
Hadrons
Heavy Ions
Iron 57
Magnetic cores
Magnetic properties
Molecular
Mossbauer spectroscopy
Nanoparticles
Nuclear Physics
Optical and Plasma Physics
Physics
Physics and Astronomy
Polyacrylonitrile
Polyanilines
Silicon dioxide
Spectra
Surface charge
Surfaces and Interfaces
Thin Films
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Summary:Two different magnetic core–shell nanohybrids, i) single coated magnetic nanoparticles (NPs) with polyacrylonitrile (PAN) and ii) doubly coated with SiO 2 and polyaniline (PANI), were synthesized by a modified chemical co-precipitation method and their structural, vibrational, colloidal, and magnetic properties were systematically studied. XRD and Rietveld refinement have shown the coexistence of 7.4(1) nm γ-Fe 2 O 3 NPs, amorphous silica, and the polymeric chains of PANI for the core-double-shell nanohybrid, i.e., γ-Fe 2 O 3 @SiO 2 @PANI NPs. The γ-Fe 2 O 3 NPs in this nanohybrid had reduced their sizes when compared to bare γ-Fe 2 O 3 NPs or to γ-Fe 2 O 3 NPs in the γ-Fe 2 O 3 @PAN nanohybrid. In addition, it has a controlled surface charge potential, i.e., it has been changed from positive in bare γ-Fe 2 O 3 /NPs to negative in γ-Fe 2 O 3 /PAN NPs (or in γ-Fe 2 O 3 @SiO 2 NPs). Raman and Infrared studies have also confirmed the surface functionalization. 57 Fe Mössbauer spectra of the 7.4(1) nm γ-Fe 2 O 3 @SiO 2 @PANI NPs revealed superparamagnetic fluctuations above 150 K, suggesting that the coating with PANI has inhibited particle agglomeration and reduced interparticle magnetic interactions. In contrast, 57 Fe Mössbauer spectra of the γ-Fe 2 O 3 /PAN NPs displayed static sextets, as commonly found in NPs bigger than 10 nm. Considering the small particle sizes (
ISSN:0304-3843
1572-9540
DOI:10.1007/s10751-022-01813-2