Preparation of Conductive Color Powders
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1207-N07-21
Preparation of Conductive Color Powders Chin-Cheng Weng*, I-Jein Cheng, Ching-Mao Wu, Yu-Chin Lin, Kuo-Tung Huang Division of Organic Opto-electronic Materials and Applications, Industrial Technology Research Institute, Taiwan, R.O.C
ABSTRACT In this paper, we report that the experimental procedures for the preparation of conductive color powders that were aggregated from color pigment and conductive materials. We first modified the pigment and make the particles surface to have charges (ex: positive) and modified another conductive materials like ITO、Au、Ag particles or conductive polymer to be opposite charges (ex: negative). Then these two kinds of charge particles will aggregate in appropriate processing by static electricity and form a powder. After annealing treatment, the conductive color powder with ITO particles reveals good thermal stability and lower surface resistivity. INTRODUCTION In this few years, many researches about a new type of display with inexpensive, light weight, low power consumption and flexible is attractive in electronic book and paper applications. Electronic paper, also called e-paper such as electrophoretic (Eink), Gyricon or polymer dispersed cholesteric display have received much interest [1,2]. E-paper is a digital display device constructed of a front panel and a backplane panel. Unlike a conventional Flat Panel Display, e-paper doesn’t use a backlight to illuminate its pixels. At present, e-paper, or flexible display technology, is being developed based on a thin, flexible substrate that can be bent, flexed, and rolled without losing functionality. All new e-paper products need full color design and a flexible conductive layer as device fabricating. However, a novel conductive color powders that could be easy used in R2R process is still not ready. The aggregation method is popularly used to make chemical toner [3-6]. Many fundamental understanding of the material parameters that determine particles charging have been studies. Herein, we use a similar concept to generate a conductive color powder that consists with pigment and conductive materials. The procedure is different to mix pigment with conductive materials. The surface charges will attract more particles to aggregate and will improve the interface contact of conductive materials and form well percolation network geometry. After annealing at 200 ℃, conductive materials provide well conductive properties.
EXPERIMENT Dispersion of conductive ITO particles
In a 250 ml PE grinding jar charged with 125ml of zirconium balls of 1mm diameter, 25.8 g of Indium Tin Oxide powder (ELECMAT, 99.99%, 40~70nm), 85g of deionized water , and 12.5g of dispersant BYK-154 (BYK Chemie, 42% active ingredient) were dispersed using a Red Devil mill for 8 hours. Dispersion of pigment (Red 122、 、G36、 、B15:6) In a 250ml PE grinding jar charged with 125ml of zirconium balls of 1mm diameter, 25g of pigment (Sun Chemical), 85g deionized water,4.5 g of dispersant Na-MOT (Commercial) were dispersed using a Red Devil mill for 8 hours. The
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