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.
Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, People's Republic of China.
Ningning
N
Guan
Yaotao
Y
Wang
Dejun
D
Sun
Jian
J
Xu
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