One-step synthesis of highly water-dispersible Mn(3)O(4) nanocrystals.
Highly water-dispersible Mn(3)O(4) nanocrystals with well-controlled size, size distribution and high crystallinity have been successfully synthesized through a modified polyol process. Poly(acrylic acid) is used as the capping agent, conferring upon the particles high water-dispersion, of which the carboxylate groups partially bind to the nanocrystal surface and the uncoordinated carboxylate groups extend into water. The water-dispersible Mn(3)O(4) nanocrystals can be further transferred to nonpolar solvent by linking oleylamine molecules through electrostatic interaction. The as-prepared Mn(3)O(4) nanocrystals exhibit ferromagnetic behavior at low temperature and weak paramagnetic behavior at room temperature. The Curie-Weiss temperature and the blocking temperature are 40 K and 32 K, respectively.
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China.
Ying
Y
Zhao
Chunguang
C
Li
Feifei
F
Li
Zhan
Z
Shi
Shouhua
S
Feng