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[en] IrO2 nanocrystals (NCs) were deposited on patterned carbon nanotube (CNT) bundle arrays via metal-organic chemical vapor deposition (MOCVD) using (C6H7)(C8H12)Ir as a source reagent. The structural and spectroscopic properties of the IrO2/CNTs composite were characterized by field-emission scanning electron microscopy, Raman spectroscopy and transmission electron microscopy. The combined effects of the geometrical structure of IrO2/CNTs, and the natural conducting and enhanced resistance to oxidation properties of IrO2 lead to a low turn-on field of 0.9 V/μm at a current density of 0.1 μA/cm2, a low threshold field of 2.7 V/μm at a current density of 1 mA/cm2, a high field enhancement factor of 7.4 x 103, and long-term stability for the IrO2/CNTs composite. The results indicate that the IrO2/CNTs composite can be a potential candidate for field emission devices.