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    • Keywords


      Graphene oxide; TiO$_2$ nanotubes; electronic effect; grain boundary.

    • Abstract


      Graphene oxide (GO)-based nanocomposites have received a great attention due to their emerging applications. Here, we thoroughly examined the structural, electronic and surface properties of GO/TiO$_2$ nanotubes nanocomposite. The nanocomposite is prepared by simple impregnation of TiO$_2$ nanotubes (HNT400) with GO dispersion. GO is elaborated byan improved Hummer’s method, while HNT400 is obtained using alkaline hydrothermal treatment of TiO$_2$ P25, followed by calcination at 400$^{\circ}$C. XRD and Raman analyses show that GO nanosheets do not change the structural properties of TiO$_2$ nanotubes. TEM analysis confirms the formation of GO nanosheets assembled to TiO$_2$ nanotubes. XPS and EPR results confirm the electron transfer between GO and TiO$_2$ nanotubes. PL analysis reveals that GO inhibits the recombination of photogenerated electron–hole pairs in the nanocomposite. The ac conductivity measurements suggest the presence of grain and grain boundary effects in GO/HNT400.

    • Author Affiliations



      1. Laboratoire de Chimie des Matériaux et Catalyse (LCMC), Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 El Manar, Tunisia
      2. Laboratoire de Valorisation des Matériaux Utiles (LVMU), Pôle Technologique Borj Cedria, Centre National des Recherches en Sciences des Matériaux, 8027 Soliman, Tunisia
      3. Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering, Institute of Energy Technologies, Universitat Politècnica de Catalunya, EEBE, Eduard Maristany 16, 08019 Barcelona, Spain
      4. Laboratoire Matériaux Organisation et Propriétés (LR99ES17), Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 El Manar, Tunisia
      5. College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia
      6. Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
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