Growth of Well Aligned IrO2 Nanotubes on LiTaO3(012) Substrate
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- 作者：Reui-San Chen ; Ying-Sheng Huang ; Dah-Shyang Tsai ; Surajit Chattopadhyay ; Chien-Ting Wu ; Zon-Huang Lan ; and Kuei-Hsien Chen
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：June 15, 2004
- 年：2004
- 卷：16
- 期：12
- 页码：2457 - 2462
- 全文大小：388K
- 年卷期：v.16,no.12(June 15, 2004)
- ISSN：1520-5002
文摘
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 characterizedusing field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and micro-Raman spectroscopy. FESEM and TEMmicrographs 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-sectionsand open-end morphology with the long axis toward the [001] direction. The analysis ofselected area diffraction (SAD) and XRD patterns indicated the epitaxial growth of IrO2nanotubes on LTO (012) with the orientation relationship given by IrO2(101)//LTO(012) andIrO2[0
0]//LTO[100]. The probable mechanism for the formation of nanotubes has beendiscussed. Micro-Raman spectrum shows the red-shift and peak broadening of the IrO2signatures with respect to that of the bulk counterpart which may be indicative of a phononconfinement effect for these nanotubes.
from the normal to the substrate. The IrO2 nanotubes showed square cross-sectionsand open-end morphology with the long axis toward the [001] direction. The analysis ofselected area diffraction (SAD) and XRD patterns indicated the epitaxial growth of IrO2nanotubes on LTO (012) with the orientation relationship given by IrO2(101)//LTO(012) andIrO2[00]//LTO[100]. The probable mechanism for the formation of nanotubes has beendiscussed. Micro-Raman spectrum shows the red-shift and peak broadening of the IrO2signatures with respect to that of the bulk counterpart which may be indicative of a phononconfinement effect for these nanotubes.