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Sulfidation of Magnetite Nanoparticles – Following the Polysulfide Pathway
Author(s) -
Bendt Georg,
Saddeler Sascha,
Schulz Stephan
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201801075
Subject(s) - sulfidation , oleylamine , polysulfide , chemistry , nanoparticle , spinel , x ray photoelectron spectroscopy , sulfur , pyrite , magnetite , inorganic chemistry , greigite , phase (matter) , thiosulfate , nuclear chemistry , chemical engineering , mineralogy , metallurgy , organic chemistry , materials science , electrode , engineering , electrolyte
The in‐situ sulfidation of sub‐10 nm sized Fe 3 O 4 and partial‐substituted Co x Fe 3– x O 4 ( x = 0.25–0.75) nanoparticles by hot‐injection of sulfur dissolved in oleylamine (OA) is strongly time‐ and temperature dependent. Fe 3 O 4 nanoparticles are completely converted within 5 minutes into Fe 3 S 4 nanoparticles with preservation of the spinel structure at 250 °C, whereas higher reaction temperatures and prolonged reaction times result in additional sulfur uptake and formation of pyrite FeS 2 nanoparticles. The formation of the cubic (Co,Fe)S 2 phase was observed in sulfidation reactions of Co x Fe 3– x O 4 , even with low Co substitution levels ( x = 0.25). The chemical composition, morphology, and phase purity of the resulting nanoparticles were investigated by EDX, XRD, TEM, and XPS.