| 초록 |
Reflective electrochromic display (R-ECD) based on the viologen-modified polymeric microspheres was prepared, and the influence of particle size on the electro-optical characteristics was investigated. At first, the functionalized polymeric microspheres were produced through the seeded polymerization, and then viologen moieties were refluxed on the surface in toluene (Scheme 1). In order to control the diameter of viologen-modified polymeric microspheres, the size of polystyrene seed particles was altered using the solvency of medium. The color efficiency and switching time of R-ECD maybe depended largely on the size of polymeric microspheres due to their specific area. The particle size and morphology were monitored utilizing an optical microscope (OM), and a scanning electron microscope (SEM), respectively. The existence of viologen pendants was confirmed using energy dispersive X-ray spectroscopy (EDAX). Redox reactions of the R-ECD were examined by cyclic voltammetry. Reflectance of the R-ECD cell was observed by a spectrophotometer. Response times were recorded using a white LED array spectrophotometer in combination with a digital multimeter as shown in Scheme 2.
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