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Structural-Color Patterns Direct-Written with Viscoelastic Colloidal Dispersions
김종빈,채창주,한상훈,이수연,김신현 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Nature has shown us structural-colors on plants or animals, where periodic structures are built in. The periodicity is high or low to make photonic crystals or glasses, and the structures have been artificially fabricated to serve as sensors or anticounterfeiting. Their patterning enhances the uses but it is limited to regioselectivity construct the structures with high reflectance. Here, we direct-write viscoelastic colloidal dispersions to make both photonic crystal or glass patterns. The viscosity of acrylate polymer either allows or frustrates colloidal crystallization, thus making photonic crystals or glasses, respectively. High temperature accelerates the former crystallization, achieving 90% of reflectance in 10 min. The photonic inks are direct-written into either a line or face making complex patterns. The mechanical property is adjusted by polymer types so that the patterns are formed on 3D structures. This study opens a new avenue for the customization of photonic patterns.
Wet-chemically derived inorganic functional materials for electronics and energy applications
정선호,조예진,이은정,오상진,채창주,김성집,서영희,류병환,최영민 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
In the field of electronic applications and energy devices, wet-chemical based functional materials have been of paramount interest and importance. In this talk, I present the inorganic soluble functional materials for thin-film transistors (TFTs), transparent/stretchable electronics, photovoltaics, and batteries. For soluble inorganic conductors, I will explain the chemical/physical requisites (such as oxidation stability, long-term dispersion stability, good adhesion property, work function modulation, and chemical stability) in carbons/metal nanoparticles for various electronics. For soluble amorphous oxide semiconductors (AOSs), I introduce the pathways to resolve the critical problems, a high processing temperature and a low mobility of AOSs annealed at low temperatures. The dependency of TFT performances on the chemical structure of AOSs is compared and contrasted to clarify which factor should be considered to realize the low temperature annealed, high performance AOSs. CI(G)S semiconductor nanoparticles for solutionprocessable, high performance solar cells are presented by discussing how to overcome the critical drawbacks of conventional solution-processed CI(G)S absorber layers. Last, the recent decent result for Li, Naion batteries will be introduced with a novel strategy for synthesizing the anodic materials.