Growth of Well Aligned IrO 2 Nanotubes on LiTaO 3 (012) Substrate
2004; American Chemical Society; Volume: 16; Issue: 12 Linguagem: Inglês
10.1021/cm030668n
ISSN1520-5002
AutoresReui-San Chen, Ying‐Sheng Huang, Dah‐Shyang Tsai, Surajit Chattopadhyay, Chien‐Ting Wu, Z. H. Lan, Kuei‐Hsien Chen,
Tópico(s)Luminescence Properties of Advanced Materials
ResumoSelf-assembled and well-aligned IrO2 nanotubes have been grown on LiTaO3 (LTO) (012) substrates via metal-organic chemical vapor deposition (MOCVD), using (methylcyclopentadienyl)(1,5-cyclooctadiene)iridium(I) as the source reagent. The surface morphology, structural, and spectroscopic properties of the as-deposited nanotubes were characterized using field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and micro-Raman spectroscopy. FESEM and TEM micrographs revealed that the single-crystalline nanotubes were grown with a tilt angle of ∼35° from the normal to the substrate. The IrO2 nanotubes showed square cross-sections and open-end morphology with the long axis toward the [001] direction. The analysis of selected area diffraction (SAD) and XRD patterns indicated the epitaxial growth of IrO2 nanotubes on LTO (012) with the orientation relationship given by IrO2(101)//LTO(012) and IrO2[01̄0]//LTO[100]. The probable mechanism for the formation of nanotubes has been discussed. Micro-Raman spectrum shows the red-shift and peak broadening of the IrO2 signatures with respect to that of the bulk counterpart which may be indicative of a phonon confinement effect for these nanotubes.
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