Abstract
We report in detail the synthesis and characterization of V-shapedIrO2 nanowedges (NWs)with an angle of 110° between the two arms. The NWs were grown on top of rutile (R) phaseTiO2 nanorods (NRs) sitting on a sapphire (SA)(100) substrate viametal-organic chemical vapor deposition (MOCVD) by using(C6H7)(C8H12)Ir and titanium-tetraisopropoxide (TTIP,Ti[OCH(CH3)2]4) as the source reagents. The surface morphology, structural, and spectroscopic propertiesof the as-deposited nanocrystals (NCs) were characterized by field emission scanningelectron microscopy (FESEM), x-ray diffraction (XRD), micro-Raman spectroscopy,transmission electron microscopy (TEM), and selected-area electron diffractometry(SAED). The FESEM images and XRD patterns indicated growth of V-shapedIrO2(101) NWs ontop of R-TiO2 NRs. The Raman spectrum showed the nanosize induced redshift and peak broadening of theIrO2 and rutilephase of TiO2 signatures with respect to that of the bulk counterparts. TEM and SAED characterizations ofIrO2 NCs showed that the nanowedges were crystallineIrO2 with a twin plane of (101) and twin direction of at the V-junction. The probable mechanisms for the formation of well-alignedIrO2 NWs are discussed.
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