  Prevalence of electronic gadgets has been on the rise and among several
considerations that are important for furthering frontiers of utility of new
gadgets is mechanical flexibility of electronic systems. Flexible electronics
require functional materials to be held by flexible substrates that can be bent
to small radii of curvature. In addition, the functionality of the active
material has to remain intact during the process of bending. There have been
challenges in the transfer process of functional materials onto flexible
substrates as well as challenges in maintaining the functionality of these
materials during the bending process. Here we demonstrate transfer of carbon
nanotubes, a highly studied electronic material, onto flexible substrates,
mainly kapton. We study the optimum conditions of adhesion, pressure and
temperature required to obtain the strongest transferred layer. We further
study the limits on the radius of curvature that the substrate can be bent to.
