Regioselective Deposition of Colloidal Crystals on 2D-patterned Templates by Depletion-induced Assembly
발표자
()
초록
내용
The colloidal crystals show structural colors through diffraction of a selected wavelength in the visible range. To use the structural colors in various applications, the patterning of the colloidal crystals is prerequisite yet challenging. Here, we suggest the one-step method for simultaneous colloidal crystallization and pattern formation through regioselective epitaxial growth. In a confining space between the 2D pattern of dimple array and planar surface, macromolecules, served as depletants, cause a strong dimple-particle attraction and relatively weak interparticle attraction. Thus, the colloidal particles are first deposited on the dimple array to form a monolayer and further deposited on the monolayer to form multilayered colloidal crystals. As the dimple array guides the crystallization, the structural color is micropatterned along the design of the 2D pattern. This simple yet controlled method will provide a new means to produce structural color patterns for practical uses.