Fig. 4From: Chemical Vapor Deposition of Vertically Aligned Carbon Nanotube Arrays: Critical Effects of Oxide Buffer LayersPlan-view SEM images of catalyst nanoparticles formed on different buffer layers after annealing at 550 °C in the absence of C2H2: a ALD Al2O3, b EB Al2O3, c sputtered Al2O3, and d SiO2. The image in e shows the amount of catalyst nanoparticles on a different buffer layer with a 200 × 200 nm2 areaBack to article page