전기수력학적 잉크젯 프린팅을 이용한 SiO2 기반 나노 구조물의 광학적 밴드갭에 따른 구조색 연구

Abstract

In general, when expressing colors, a chemical-based dye and pigment are used. However, structural colors use physical methods. It uses the physical relationship between the arrangement of particles and light. For example, chameleons, Morpho butterfly, and opal show structural color characteristics. Recently, a fruit called Polia condensata known to use the characteristics of structural color. When using the characteristics of structural color, it has the advantage of higher chemical durability than chemical-based color expression. However, in order to express the structural color, a technique of arranging and synthesizing nano and micro-sized particles is required. Currently, lithography and Self-assembl are used among the most commonly used nanotechnology. In this paper, structural color production was performed using Electro-hydrodynamics (EHD) printing. EHD printing technology is one of the most notable technologies to solve the semiconductor shortage that occurred in the industry and could eject nano-microphone sizes by applying a voltage between a nozzle and a substrate. In addition, it includes the advantage of being able to produce a desired shape and model on the substrate. EHD Printing was used to produce structural colors. The experiment was conducted by selecting a material that is the basis of structural color. Silica particles, which are components of opal, have the advantage of being convenient in producing structural colors because they exhibit a spherical shape. In addition, since it has high stability, it was selected as a material to be used for EHD printing ink. When silica particles are ejected from EHD Printing, various parameters occur at the bottom of the nozzle depending on the size of the particles. Therefore, silica particles of different sizes were prepared. Silica particles were produced through the Stöber method. The size and shape of the silica particles produced through the above method were confirmed using FE-SEM and XRD analysis equipment. In addition, a structural color was prepared by dip-coating using silica particles. Through this, the color was observed according to whether a structural color was prepared using silica particles and the size of the silica particles. In order to produce various silica particles, an experiment was conducted by adjusting the mixing ratio of Ammonia and DI water. As a solvent, ethylene glycol and silica nanoparticle were mixed at a ratio of 1:12 to complete a silica particle-based ink to be used for EHD printing. Printing optimization was performed using EHD Printing and silica particle-based ink. In addition, structural color formation was performed inside PDMS with high electrical insulation. Structural colors were formed on the PI film surface using silica particles-based ink and EHD printing. The structural color formed on the surface of the PI film was formed inside the PDMS through the manufacturing process with PDMS.