Supercapacitor has a high power density and holds great promise for printed electronics. Thin film supercapacitors based on SWCNT networks in combination with a printable gel electrolyte have great potential as printed charge storage devices. High performance supercapacitors use carbon nanotubes to have very high capacitances due to the high surface area and amorphous carbon materials are typically used as the active material to store charge. However, the poor conductivity of the particle networks makes a metallic current collector a requirement. Stanford University scientists have developed a printable power source using nanotechnology. Here two SWCNT thin films serve as electrodes and the thin films are fabricated by suspending purified SWCNTs in water and then using an air brush pistol to spray it on hot PET substrate. Two of these films are then sandwiched together with the gel electrolyte in the middle. Such printable supercapacitors can be used as an on-chip power source for printed electronics and will be very usefull for portable electronic applications.