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Synthesis, Characterization, and Magnetic Properties of
Uniform-sized MnO Nanospheres
and Nanorods
Jongnam Park,† Eunae Kang,† Che Jin Bae,‡ Je-Geun Park,‡ Han-Jin Noh,§ Jae-Young
Kim,§ Jae-Hoon Park,§ Hyun Min Park,| and Taeghwan Hyeon*,
National CreatiVe Research InitiatiVe Center for Oxide Nanocrystalline Materials and School of
Chemical Engineering, Seoul National UniVersity, Seoul 151-744, Korea, Department of Physics
and Institute of Basic Sciences, Sungkyunkwan UniVersity, Suwon 440-746 Korea, Department of
Physics and Pohang Acceleration
Laboratory, Pohang UniVersity of Science and Technology, Pohang, Kyungbuk 790-784, Korea,
and New Material EValuation Center, Korea Research Institute of Standards and Science, Taejon
305-600, Korea
ReceiVed: April 22, 2004; In Final Form: July 5, 2004
報告人：許祐元
指導教授：王聖璋
J. Phys. Chem. B 2004, 108, 13594-13598
Introduction
 MnO2 is currently under extensive investigations for its
capacitance properties.
 manganese oxide nanostructures for their potential
applications such as catalysis, rechargeable batteries, ionsieves
and supercapacitors
 the synthesis of MnO nanospheres and nanorods from the
thermal decomposition of Mn-surfactant complexes
Experimental
Stirring
At 300℃ for 1hr
Mn2(CO)10
0.2 g
Stirring
At 100℃
Trioctylphosphine(TOP)
10 mL
complex
Oleylamine
2 mL
Triphenylphosphine(TPP)
10 mL
J. Phys. Chem. B 2004, 108, 13594-13598
Results and discussion
Inject TOP
Inject TPP
Inject TOP
At 100℃ for 2 days
Figure 1. Transmission electron micrograph of 5-, 10-, and 40-nm
monodisperse MnO nanoparticles.
J. Phys. Chem. B 2004, 108, 13594-13598
Inject TOP
At 330℃
Inject TPP
At 330℃
Figure 2. Low-resolution transmission electron micrographs of
(a) 7 x 33 nm and (b) 8 x 140 nm sized MnO nanorods,
(c) high-resolution transmissionelectron micrograph, and
(d) electron diffraction pattern of 8 140 nm sized MnO nanorods.
J. Phys. Chem. B 2004, 108, 13594-13598
MnO (JCPDS, 89-4835)
MnO (JCPDS, 07-0230)
M3O4 (JCPDS, 80-0382)
Figure 4. The powder X-ray diffraction (XRD) pattern of 8 140
nm sized MnO nanorods.
Conclusion
 we synthesized uniform-sized MnO nanospheres with particle
sizes ranging from 5 to 40 nm from the thermal decomposition
of Mn-surfactant complexes.
 When TOP and TPP were employed as the surfactants, MnO
nanorods with sizes of 7 nm (diameter) x 33 nm (length) and 8
nm (diameter) x 140 nm (length) were produced
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