Articles
  • Structure, Raman, and photoluminescence properties of SnO2/MgO core-shell nanowires
  • Hoon Huha, No-Hyung Parka, Han Gil Nab, Dong Sub Kwakb, Jinho Ahnb, Heon Hamc, Kwang Bo Shimb, Changhwan Choib, Joon-Hyuk Changd, Chongmu Leee, Inpil Kangf, Myung Ho Kongg, Dae-Sup Soh, Joon Woo Leei, Hyoun Woo Kimb,* and Kyoung Hun Kimj
  • a Korea Institute of Industrial Technology, 35-3 HongCheon-ri, Ipjang-myeon, Seobuk-gu, Cheonan-si, 331-825, Republic of Korea b Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Republic of Korea c H & H Co. LTD, Chungju National University, 50 Daehak-ro, Chungju-si, Chungbuk, 330-702, Republic of Korea d School of Electronic Engineering, Hanyang University, Seoul 133-791, Republic of Korea e Division of Materials Science and Engineering, Inha University, Incheon 402-751, Republic of Korea f Department of Mechanical and Automotive Engineering, Pukyong National University, Busan 608-739, Republic of Korea g Korea Institute of Materials Science, Changwon, Gyeongnam 641-831, Republic of Korea h National Nanotechnology Policy Center, Korea Institute of Science and Technology Information, Seoul 130-741, Republic of Korea i Department of Technology Commercialization Information, KISTI, Seoul 130-741, Republic of Korea j Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Korea
Abstract
We prepared MgO-coated SnO2 nanowires, by means of fabricating SnO2 core nanowires and subsequently evaporating an MgB2 powder onto the core nanowires. We investigated changes in the morphological, structural, Raman, and photoluminescence (PL) characteristics resulting from application of the coating process and of a thermal annealing process. The surface of the nanowires became roughened by the MgO coating. While the core nanowires corresponded to the tetragonal rutile SnO2 structure, the shell was comprised of the cubic MgO phase. Raman spectra revealed that the core-shell nanowires exhibited a weak line for MgO-associated with surface phonon modes in a TO-LO phonon gap, in addition to the SnO2-related lines. The room-temperature PL spectrum of core SnO2 nanowires exhibited a 2.1 eV-centered broad band and the peak position was invariant not also by the shell coating but also by the subsequent thermal annealing. The PL intensity was increasd by the MgO coating, being attributed to a diffusion effect. The PL reduction by the subsequent thermal annealing is ascribed to oxygen incorporation into the SnO2 core nanowires.

Keywords: Nanowires, SnO2/MgO, Transmission electron microscopy (TEM), Raman, Photoluminescence

This Article

  • 2011; 12(6): 742-747

    Published on Dec 31, 2011

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