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報告人 ：許祐元 指導教授：王聖璋

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報告人 ：許祐元 指導教授：王聖璋

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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.

  7. 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

  8. inject Oleylamine 18 mmol at 300 ℃ for 1hr

  9. 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

  10. MnO (JCPDS 75-1090)

  11. Future work • MnO was dissolved in oleic acid at 300℃ for 30 min. • Try different reaction temperature and reaction time • Try different surfactant

  12. Thanks for your attention

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