caa a22 4500 463211642 CHVBK 20180405153142.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s00339-007-4063-0 doi (NATIONALLICENCE)springer-10.1007/s00339-007-4063-0 Electron spin resonance from annealed titania nanotubes [Elektronische Daten] [J.M. Cho, W.J. Yun, J.-K. Lee, H.S. Lee, W.W. So, S.J. Moon, Y. Jia, H. Kulkarni, Y. Wu] Titania nanotubes were prepared using a hydrothermal method. Hydrogen titanate nanotubes (H-TNTs) with an anatase phase changed to anatase nanocrystals at about 500°C, and then a rutile structure at ∼800°C. A sharp and symmetrical electron spin resonance (ESR) signal (g=2.003), attributed to a single-electron-trapped oxygen-vacancy (SETOV), was obtained at the annealed H-TNTs (T<500°C). The SETOV signal increased and maximized remarkably at about 400-500°C. Then, the nanotube structure appeared to be demolished. Yet, when the vacuum-heated H-TNTs were sealed in N2 or Ar ambient, some additional ESR signals appeared besides the SETOV signal. The broad asymmetric ESR signal (g=1.98) was attributed to a surface oxygen vacancy related to the Ti3+ sites in a reduced TiO2 matrix. The vacuum-heated sodium titanate nanotubes (Na-TNTs) showed only the SETOV signal (T<500°C). Springer-Verlag, 2007 Cho J.M. Department of Physics, Chonbuk National University, 561-756, Jeonju, Korea aut Yun W.J. Department of Physics, Chonbuk National University, 561-756, Jeonju, Korea aut Lee J.-K Department of Physics, Chonbuk National University, 561-756, Jeonju, Korea aut Lee H.S. Jeonju Center of Korea Basic Science Institute, 561-756, Jeonju, Korea aut So W.W. Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology, 305-343, Daejeon, Korea aut Moon S.J. Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology, 305-343, Daejeon, Korea aut Jia Y. Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA aut Kulkarni H. Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA aut Wu Y. Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA aut Applied Physics A Springer-Verlag 88/4(2007-09-01), 751-755 0947-8396 88:4<751 2007 88 339 https://doi.org/10.1007/s00339-007-4063-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-4063-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cho J.M. Department of Physics, Chonbuk National University, 561-756, Jeonju, Korea aut NATIONALLICENCE 700 1- Yun W.J. Department of Physics, Chonbuk National University, 561-756, Jeonju, Korea aut NATIONALLICENCE 700 1- Lee J.-K Department of Physics, Chonbuk National University, 561-756, Jeonju, Korea aut NATIONALLICENCE 700 1- Lee H.S. Jeonju Center of Korea Basic Science Institute, 561-756, Jeonju, Korea aut NATIONALLICENCE 700 1- So W.W. Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology, 305-343, Daejeon, Korea aut NATIONALLICENCE 700 1- Moon S.J. Advanced Chemical Technology Division, Korea Research Institute of Chemical Technology, 305-343, Daejeon, Korea aut NATIONALLICENCE 700 1- Jia Y. Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA aut NATIONALLICENCE 700 1- Kulkarni H. Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA aut NATIONALLICENCE 700 1- Wu Y. Department of Physics and Astronomy, University of North Carolina, 27599, Chapel Hill, NC, USA aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/4(2007-09-01), 751-755 0947-8396 88:4<751 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer