Synthesis, Characterization, and Magnetic Properties of Uniform-sized MnO Nanospheres
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報告人 :許祐元 指導教授:王聖璋

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Synthesis, Characterization, and Magnetic Properties of Uniform-sized MnO Nanospheresand NanorodsJongnam 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 AccelerationLaboratory, 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, KoreaReceiVed: 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

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

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

Results and discussion

Inject TPP

Inject TOP

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


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Inject TPP

At 330℃

Inject TOP

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


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MnO (JCPDS, 07-0230)

MnO (JCPDS, 89-4835)

M3O4 (JCPDS, 80-0382)

Figure 4. The powder X-ray diffraction (XRD) pattern of 8 140

nm sized MnO nanorods.


Conclusion

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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inject

Oleylamine 18 mmol at 300 ℃ for 1hr


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inject

Oleylamine 3 mmol at 300 ℃ for 30 min

Mn(HCOO)2 3 mmol+ oleylamine 20 mmol at 340 ℃ for 5-10 min

Chem. Mater., Vol. 18, No. 7, 2006


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MnO (JCPDS 75-1090)


Future work

Future work

  • MnO was dissolved in oleic acid at 300℃ for 30 min.

  • Try different reaction temperature and reaction time

  • Try different surfactant


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Thanks for your attention


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