▎ 摘　　要

NOVELTY - The method involves providing a substrate with a predetermined pattern or circuit of three-dimensional structural features in the thickness of the substrate to create three-dimensional open or closed microchannels in directions of any of the length, width, and thickness of the substrate. The microchannels has surfaces. Some of microchannel surfaces of selected microchannels are coated. Flow of a liquid is controlled that provides viscous or solution-form carbon-based conductive materials or nano-materials. The electrically-conductive components of the liquid at a controlled thickness and coverage of the surfaces of the selected microchannels are adhered. A polymer solution is placed over the conductive three-dimensional pattern. The conductive three-dimensional pattern is transferred to the second substrate by separating the second substrate from the first substrate. USE - Method for fabricating a two dimensional or three dimensional conductive pattern or circuit in a substrate. ADVANTAGE - Method represents a substantive departure from the status quo by developing not only direct fabrication of graphene-based circuits on patterned surfaces but also enables the fabrication of polymeric flexible electronics with precise control of 3D microstructural and mechanical properties and with high resolutions of graphene patterns. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) A flexible electronic device made according to a process; (2) A system for fabricating 2D or 3D milli- or micro scale circuits on a substrate;