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HL: Fachverband Halbleiterphysik

HL 114: Oxides: Bulk, films and interfaces

HL 114.3: Vortrag

Freitag, 4. April 2014, 10:00–10:15, POT 251

Diameter-dependent Absorption Edges of One-dimensional TiO2 Nanotube Arrays by Atomic Layer Deposition — •Ahmed Al-Haddad^1,2, Samar Tarish^1,2, Ranjith Vellacheri¹, Wenxin Wang¹, Fabian Grote¹, Zhibing Zhan¹, and Yong Lei¹ — ¹Ilmenau University of Technology, Institute of Physics & IMN MacroNano (ZIK) Prof. Schmidt-Str. 26, 98693 Ilmena,Germany. — ²Department of Physics, College of Science, The University of Mustansiryah, Baghdad, Iraq.

Free standing one-dimensional (1-D) TiO2 nanotube arrays (TNAs) were fabricated by atomic layer deposition (ALD) with the assistant of anodic aluminum oxide templates at 350 °C. The wall thickness of nanotubes can be precisely controlled using ALD recipe. The intensities of the UV-Vis absorption were enhanced with increasing the diameter of nanotube while the thickness of the nanotubes walls was kept constant. A blue-shift was observed when decreasing the diameter of nanotubes, indicating a change of band gap and the shift of absorption edges towards shorter wavelengths were ascribed to the quantum effect of nanotube wall. Furthermore, the structure and surface morphology of the TNAs were examined by Raman spectroscopy and scanning electron microscopy, respectively.