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The outstanding field emission characteristics of Carbon Nanotubes (CNT) offer promising potential for a wide range of vacuum electronics applications. In this study, short (1 µm) CNT arrays were grown selectively on SiO2/Si substrates using ferrocene/xylene catalyst source. High field emission current density of 366.7 mA/cm2 was obtained. A common field enhancement factor (β) value of 326 was obtained for CNT bundles with various separation distances.