Magnetic, structural, and electronic properties of iron sulfide Fe3S4 nanoparticles synthesized by the polyol mediated process

Iron (III) sulfide particles produced by a polyol method

“…The S atoms occupy a face-centered-cubic (fcc) lattice, and Fe atoms occupy only Oh position in pyrrhotite FeS, whereas Fe atoms occupy both Oh and Td positions in Fe 3 S 4 . It has been proposed that Fe 2 S 3 has a spinel structure analogous to maghemite γ -Fe 2 O 3 [10]. In this case, cation vacancies occur in the Oh position of the greigite Fe 3 S 4 .…”

“…The magnetic properties and structures of metastable Fe 2 S 3 embedded in pyrrhotite have been discussed [8], and it has been proposed that Fe 2 S 3 has a hexagonal structure with ferromagnetic properties. Recently, Lyubutin et al prepared Fe 1−x S nanoparticles by thermal decomposition of a mixture of iron-oleylamine and sulfur oleylamine [9], and Fe 3 S 4 nanoparticles were also synthesized by a polyol process [10]. It was further reported that small particles (<9 nm) of γ -Fe 2 S 3 have a spinel structure and exhibit paramagnetic properties down to 90 K. We have produced various iron sulfide particles using a polyol method, and obtained a mixture of FeS, Fe 3 S 4 , and Fe 2 S 3 by varying the ratios of starting materials [11]: a mixture of ferrocene, 1,2-hexadecanediol (HD), and 1-octadecanethiol (OT) in oleylamine (OA).…”

HMTA-assisted One-pot Synthesis of Greigite Nano-platelet and Its Magnetic Properties

“…However, a single iron source, whether Fe 2+ or Fe 3+ , often produces multiple iron sulfide phases [32,33] . If choosing Fe 3+ , a gentle reductant such as formic acid [24] or ascorbic acid [16] is necessary to be introduced to yield Fe 2+ ; while if using Fe 2+ , weak inorganic or organic oxidants like elemental sulfur [21,22,34,35] , polysulfide anions [35,36] , an appropriate amount of oxygen [14,35] , cysteine (possibly in the form of cystine) [4,17,20,35] and other organic species [19] are needed to produce Fe 3+ . A protein macromolecule can also act as an oxidant.…”

“…As a result, the growth of pure Fe3S4 crystals in the laboratory often requires strictly defined conditions, toxic reagents, extreme temperatures and, in some cases, time consuming post-synthetic processing [14][15][16] . The most frequently used method is hydrothermal reaction between iron salts and sulfur-bearing compounds in aqueous or organic solvents at temperature between about 150 and 300°C [4,[17][18][19][20][21][22][23][24] . In those studies, different organic reactants and additives were used and particles with a variety of sizes and shapes were produced.…”

Intensification of the separation of CuO nanoparticles from their highly diluted suspension using a foam flotation column with S type internal

“…Due to their extremely high specific surface areas, nanoparticles possess unexpected optical, electric, thermal, magnetic, or chemical properties, so they have wide applications in biomedical, optical, food, and electronic fields (Qiang et al 2006;Rehman et al 2011;Aresta et al 2013;Lyubutin et al 2013). However, nanoparticles also result in serious environmental pollution and harm to human health (Donaldson et al 2006), because they readily diffuse to air and water and become suspended in them (Stone et al 2007;Valcárcel 2011).…”