  Super capacitors are promising energy storage devices due to their capability
of delivering high peak current and storing high amount of energy in a short
time with very low internal power loss. We fabricated the graphene or graphite
oxide super-capacitor using laser Lightscribe technique. We prepared graphite
oxide by modified hummers method and used PET film as a flexible substrate on
which graphite oxide (GO) was coated. Using Lightscribe drive and software, the
super-capacitor configuration was patterned on the GO coated PET film. During
the writing process, the laser converts GO into graphene. We characterized the
fabricated flexible super-capacitor which exhibits high resistance of 20KOhm
with applied voltage of 10V and further increase of voltage (20V) decreases the
resistance to 8KOhm. We also analyzed the frequency response of the capacitor
using impedance measurement which shows high frequency response and estimated
capacitance is 120nF. We optimized the patterns by running the Lightscribe
repeatedly on the GO coated PET substrate.
