“…Digital circuits based on carbon nanotubes depends of the diameter of them, because it is directly proportional to the Schottky barrier height formed by the carbon nanotube and metal contacts of the source and drain terminals (Andriotis et al, 2006(Andriotis et al, , 2007(Andriotis et al, , 2008Javey & Kong, 2009). In addition, larger diameters reduce the I ON /I OFF ratio and voltage swing, which is the key to achieve very high speed operation and high definition of the output signal, respectively.…”