TY - JOUR
T1 - Size-controlled synthesis of quasi-monodisperse transition-metal ferrite nanocrystals in fatty alcohol solutions
AU - Adireddy, Shiva
AU - Lin, Cuikun
AU - Palshin, Vadim
AU - Dong, Yuming
AU - Cole, Richard
AU - Caruntu, Gabriel
PY - 2009
Y1 - 2009
N2 - Quasi-monodisperse hydrophobic transition-metal ferrite MFe 2O4 (M = Mn, Fe, Co, Ni, Zn) nanocrystals were synthesized by the thermolysis of transition-metal acetates in oleyl alcohol solutions under aerobic conditions. The proposed reaction protocol is simple, rapid, and highly versatile because it takes advantage of the multiple roles of the oleyl alcohol molecules, namely, solvent for the precursors, reaction medium, and capping ligand for the metal oxide nanoparticles. A systematic FT-IR spectroscopy study has indicated that the transition-metal ferrite nanoparticles are precipitated in oleyl alcohol solutions via a thermal decomposition process with no evidence about a potential esterification reaction, involving the long-chain alcohol and the metal acetate salt. A detailed characterization of the oleyl alcohol capped ferrite nanoparticles was performed by XRD, TEM, SAED, EXAFS, FT-IR, and SQUID measurements. The as-prepared transition-metal ferrite nanocrystals are spherically shaped, and their average diameter can be conveniently tuned between 4 and 15 nm by increasing the heating rate of the solution. The surface composition of the nanoparticles can be modified via ligand-exchange reactions through which the nanocrystals can be rendered soluble in polar solvents without altering their morphology. The oleyl alcohol capped ferrite nanocrystals typically exhibit a superparamagnetic behavior with blocking temperatures depending on both the nature of the transition metal and the size of the nanocrystals.
AB - Quasi-monodisperse hydrophobic transition-metal ferrite MFe 2O4 (M = Mn, Fe, Co, Ni, Zn) nanocrystals were synthesized by the thermolysis of transition-metal acetates in oleyl alcohol solutions under aerobic conditions. The proposed reaction protocol is simple, rapid, and highly versatile because it takes advantage of the multiple roles of the oleyl alcohol molecules, namely, solvent for the precursors, reaction medium, and capping ligand for the metal oxide nanoparticles. A systematic FT-IR spectroscopy study has indicated that the transition-metal ferrite nanoparticles are precipitated in oleyl alcohol solutions via a thermal decomposition process with no evidence about a potential esterification reaction, involving the long-chain alcohol and the metal acetate salt. A detailed characterization of the oleyl alcohol capped ferrite nanoparticles was performed by XRD, TEM, SAED, EXAFS, FT-IR, and SQUID measurements. The as-prepared transition-metal ferrite nanocrystals are spherically shaped, and their average diameter can be conveniently tuned between 4 and 15 nm by increasing the heating rate of the solution. The surface composition of the nanoparticles can be modified via ligand-exchange reactions through which the nanocrystals can be rendered soluble in polar solvents without altering their morphology. The oleyl alcohol capped ferrite nanocrystals typically exhibit a superparamagnetic behavior with blocking temperatures depending on both the nature of the transition metal and the size of the nanocrystals.
UR - http://www.scopus.com/inward/record.url?scp=73949140469&partnerID=8YFLogxK
U2 - 10.1021/jp905955k
DO - 10.1021/jp905955k
M3 - Article
AN - SCOPUS:73949140469
VL - 113
SP - 20800
EP - 20811
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 49
ER -