| 초록 |
Here, we have developed a new method that incorporates solution-mediated crystallization into nanoscale 3D printing. The key idea is to exploit a femtoliter solution meniscus formed on a nanopipette to guide evaporation-induced crystallization in mid-air. Evaporative loss of solvent rapidly creates a supersaturated field of solutes inside the femtoliter meniscus, leading to nucleation and growth of nanocrystals. Furthermore, omnidirectional guiding of the meniscus with moving the nanopipette realizes freeform 3D nanostructures with excellent crystallinity. By employing this method, we have successfully demonstrated nanoscale 3D printing of two promising material systems: (1) organic-inorganic metal halide perovskites and (2) diphenylalanine. In this talk, we will present the theoretical and experimental results including examples of 3D printed crystalline structures and discuss prospects of our work for potential applications in electronics and optoelectronics. |
