Carbon nanotubes (CNTs) have attracted considerable
research interest in the last decade because of their
unique optical, electronic, magnetic, mechanical, and
gas adsorption properties. They have been regarded as
promising candidates for versatile applications.
Exhibiting high electrical conductivity and high electron
storage capacity (one electron for every 32 carbon
atoms) (Kongkanand and Kamat 2007; Kongkanand
et al. 2007), CNTs can act as extremely effective
electron sinks. Hence, CNTs supported with metal
oxide nanoparticles are expected to exhibit different
physical properties from those of neat CNTs.