Growth of well aligned IrO2 nanotubes on LiTaO3(012) substrate

Reui San Chen, Ying Sheng Huang*, Dah Shyang Tsai, Surajit Chattopadhyay, Chien Ting Wu, Zon Huang Lan, Kuei Hsien Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Self-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 IrO 2 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 IrO 2 nanotubes on LTO (012) with the orientation relationship given by IrO2(101)//LTO(012) and IrO2[010]//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.

Original languageEnglish
Pages (from-to)2457-2462
Number of pages6
JournalChemistry of Materials
Issue number12
StatePublished - 15 Jun 2004


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