Fig. 26

a Schematic of steps involved in fabrication of patterned catalyst array on undoped Si substrates using colloidal lithography. The spheres represent polystyrene spheres with a diameter of 450 nm. Adapted from [197]. b SEM image of the individual SWCNTs connected between catalyst patterned nanoparticle arrays. Adapted from [197]. c, d AFM image of individual SWCNTs with diameter of ~ 2 nm. Adapted from [197]. Green line shows the d corresponding cross-section. Adapted from [197]