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Controlling the Sulfidation Process of Iron Nanoparticles: Accessing Iron−Iron Sulfide Core‐Shell Structures
Author(s) -
Heift Dominikus,
Lacroix LiseMarie,
Lecante Pierre,
Fazzini PierFrancesco,
Chaudret Bruno
Publication year - 2018
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201800027
Subject(s) - sulfidation , iron sulfide , sulfide , inorganic chemistry , materials science , iron oxide , hydrogen sulfide , chemical engineering , chemistry , iron nitride , metallurgy , nanotechnology , sulfur , nitride , engineering , layer (electronics)
Iron sulfide nanocomposites have been prepared through reactions of bis[bis(trimethylsilyl)amido]iron(II) or zerovalent iron nanoparticles (NPs) with hydrogen sulfide gas. The chemical composition of these materials was analyzed by TEM, XRD, WAXS and Mössbauer measurements. Decomposition of bis[bis(trimethylsilyl)amido]iron(II) under an H 2 S atmosphere in the presence of palmitic acid produces thin iron sulfide nanoflakes, which seemingly consist of Fe 2 S 2 and Fe 7 S 8 . The sulfidation of 9 nm zerovalent iron NPs with H 2 S yields thin nano flakes exhibiting the same iron sulfide phases and residual iron. Remarkably, treatment of slightly larger iron NPs (13 nm) with H 2 S (or alternatively benzylthiol) yields well‐shaped iron–iron sulfide core‐shell particles. These particles exhibit a crystalline iron core and an amorphous iron sulfide shell, which likely consists of Fe 2 S 2 , Fe 7 S 8 and Fe 1−X S. Magnetic measurements on these core‐shell particles show a decrease of the total magnetization (compared to bulk iron) coming along with the sulfidation process. Owing to the partially preserved ferromagnetic character these iron–iron sulfide core‐shell particles were found to have magnetic heating properties.