The world-wide competition in nanotechnology research has now reached a stage where process technologies, especially self-assembling and printing technologies with better productivity are required rather than poorly reproducible champion data. We have been achieving remarkable results about optoelectronic molecules, conducting polymers, nano-particles, carbon nanotubes, and soft materials, all of which with nanometer size and excellent individual functions. At present, we focus on utilizing these functions in micrometer to millimeter-sized (mesoscopic) assemblies, which can work as realistic interfaces between the nano and real world. Specifically, highly-functional, high-performance and industrially feasible devices such as sensors, memories, and displays are created by the atomic, molecular and mesoscopic level control of structures and properties. Among them, two topics are presented, which are concerned with entirely printed organic thin-film-transistor (TFT) array on plastic substrate by microcontact printing and flexible electrochromic display panel by using nanoparticle ink.
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