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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.24 No.8 pp.423-428
DOI : https://doi.org/10.3740/MRSK.2014.24.8.423

Synthesis of Fe-Doped TiO2/α-Fe2O3 Core-Shell Nanowires Using Co-Electrospinning and Their Magnetic Property

Bon-Ryul Koo, Hyo-Jin Ahn
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Korea
Corresponding author
E-Mail : hjahn@seoultech.ac.kr (H.-J. Ahn, Seoul Nat'l Univ.)
2014년 7월 17일 2014년 7월 23일 2014년 7월 24일

Abstract

We synthesized Fe-doped TiO2/α-Fe2O3 core-shell nanowires(NWs) by means of a co-electrospinning method and demonstrated their magnetic properties. To investigate the structural, morphological, chemical, and magnetic properties of the samples, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy were used, as was a vibrating sample magnetometer. The morphology of the nanostructures obtained after calcination at 500 oC exhibited core/shell NWs consisting of TiO2 in the core region and α-Fe2O3 in the shell region. In addition, the XPS results confirmed the formation of Fe-doped TiO2 by the doping effect of Fe3+ ions into the TiO2 lattice, which can affect the ferromagnetic properties in the core region. For comparison, pure α-Fe2O3 NWs were also fabricated using an electrospinning method. With regard to the magnetic properties, the Fe-doped TiO2/α-Fe2O3 core-shell NWs exhibited improved saturation magnetization(Ms) of approximately ~2.96 emu/g, which is approximately 6.1 times larger than that of pure α-Fe2O3 NWs. The performance enhancement can be explained by three main mechanisms: the doping effect of Fe ions into the TiO2 lattice, the size effect of the Fe2O3 nanoparticles, and the structural effect of the core-shell nanostructures.

복합 전기방사법을 이용한 Fe-doped TiO2/α-Fe2O3 이중구조 나노와이어의 합성 및 자성 특성

구본율, 안효진
서울과학기술대학교 신소재공학과

초록


     

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