• Title/Summary/Keyword: Magnetic powders

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Synthesis of TiO2-Fe2O3 Nanocomposite Powders for Magnetic Photocatalyst (자성광촉매용 TiO2-Fe2O3 나노복합분말의 합성)

  • Lee Chang-Woo;Kim Soon-Gil;Yun Sung-Hee;Lee Jai-Sung;Choa Yong-Ho
    • Korean Journal of Materials Research
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    • v.15 no.8
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    • pp.508-513
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    • 2005

  • [ $TiO_2-Fe_2O_3$ ] nanocomposite powders for magnetic photocatalyst were synthesized by sol-gel process, in which $TiO_2$ photocatalytic layer was formed on the surface of $\gamma-Fe_2O_3$ magnetic core. Transmission electron microscopy (TEM) observation and X-ray diffractometry (XRD) analysis revealed that$\gamma-Fe_2O_3$ nanoparticles, $10\~20nm$ in diameter, were coated by $TiO_2$ shell of 5nm in thickness and $TiO_2$ was anatase phase. Also hydroxyl group (-OH) used to decompose organic compounds was detected by Fourier transformation infrared spectrometry(FT-IR) analysis. UV-Visible spectrophotometry results showed that light absorption occurred in the wavelength range of $400\~700 nm$, and the band gap energy $(E_g)$ of powder was 1.8 eV. Finally it was found that the coercivity $(H({ci})$ and saturation magnetization $(M_s)$ of the powder were 79 Oe and 14.8 emu/g, respectively as experimental vibrating sample magnetometer (VSM) measurements.

  • https://doi.org/10.3740/MRSK.2005.15.8.508 인용 PDF KSCI