A simple one-pot synthesis of single-crystalline magnetite hollow spheres from a single iron precursor.
This paper presents a facile route using a simple solvothermal reaction to synthesize monodisperse and single-crystalline Fe(3)O(4) hollow spheres. Fe(3)O(4) hollow spheres with a mean diameter of 200 nm are fabricated using the coordination compound [Fe(urea)(6)]Cl(3) as the sole iron source, in the absence of any other additives. TEM, SEM and HRTEM results show that single-crystalline Fe(3)O(4) hollow spheres are composed of well-aligned nanoparticles. The as-prepared hollow spheres have a Brunauer-Emmett-Teller (BET) surface area of about 16.251 m(2) g(-1) with an average pore size of 3.537 nm. The hollow spheres display obvious ferromagnetism at room temperature with a saturation magnetization of 79.58 emu g(-1), a remanent magnetization of 19.1 emu g(-1) and coercivity of 133.5 Oe. The growth mechanism of single-crystalline Fe(3)O(4) hollow spheres is attributed to the cooperation of oriented aggregation and Ostwald ripening.
Guan
Ningning
N
Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, People's Republic of China.
Wang
Yaotao
Y
Sun
Dejun
D
Xu
Jian
J
D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008863:Microspheres; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013499:Surface Properties
D005290:Ferric Compounds; D046911:Macromolecular Substances; C000499:ferric oxide; D007501:Iron; D052203:Ferrosoferric Oxide