NOVELTY - A nanostructured double-sided supercapacitor device comprises substrate (60'), primary metal catalyst layer (70') on the substrate, electroconductive layer disposed on the primary metal catalyst layer to form finger electrodes and contact pads, secondary metal catalyst layer (80) on the finger electrodes, carbon nanotubes (50), electrolyte filled into the finger electrodes and carbon nanotubes, and encapsulating bottom and top encapsulating the interdigitated finger electrodes (20), carbon nanotubes and electrolyte. The finger electrodes are configured to be interdigitated.    USE - Nanostructured double-sided supercapacitor device. Uses include but are not memory backup device, electric vehicle, military weapon, space equipment and electronic equipment.    ADVANTAGE - The nanostructured double-sided supercapacitor device has excellent durability. The carbon nanotubes in the nanostructured double-sided supercapacitor device have excellent conductivity and high surface area.    DETAILED DESCRIPTION - A nanostructured double-sided supercapacitor device comprises substrate, primary metal catalyst layer disposed on top of the substrate, electroconductive layer disposed and etched on top of the primary metal catalyst layer to form finger electrodes and contact pads, secondary metal catalyst layer disposed on the top of the finger electrodes, carbon nanotubes extending from the exposed primary and secondary metal catalyst layers of the finger electrodes, electrolyte filled into the finger electrodes and carbon nanotubes, and encapsulating bottom and top encapsulating the interdigitated finger electrodes, carbon nanotubes and electrolyte. The finger electrodes are configured to be interdigitated. When the secondary metal catalyst layer is disposed, the substrate is etched to expose the primary metal catalyst layer under the finger electrodes, such that the top and bottom surfaces of the finger electrodes are exposed. An INDEPENDENT CLAIM is included for fabrication of nanostructured double-sided supercapacitor device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of the nanostructured double-sided supercapacitor device.    Interdigitated finger electrode (20)    Carbon nanotubes (50)    Substrate (60')    Primary metal catalyst layer (70')    Secondary metal catalyst layer (80)