表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
In2O3-Sn系白色導電粉のカップリング剤処理
長岡 茂好本 昭洋岡崎 直美原田 孝真嶋 宏
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1996 年 47 巻 5 号 p. 433-437

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In a previous paper the authors reported a novel wet preparation method for electro-conductive white powders homogeneously coated with In2O3-Sn film. Further experiments were performed to obtain insight into aging treatment of the suspension after hydrolysis reaction of the ITO compound, and into coupling agent treatment to stabilize the electro-conductivity of the resulting powders. The electro-conductivity of the final product was greatly improved by aging a suspension of fine powders coated with mixed ITO composition hydroxides for 60 minutes at pH 6.5±0.5 and 343K. Generally, the electro-conductivity of ITO-coated powders deteriorates owing to the influence of atmospheric oxygen. Coupling agent treatment of ITO-coated powders was found to be very effective in averting this effect. The applicability of various coupling agents, both silane type and titanate type, were examined. A coupling agent is an insulator by nature, so the use of excess amounts must be avoided. However, a suitable amount of coupling agent treatment exhibited remarkable effectiveness in improving the electro-conductivity of ITO-coated powders. A silane type coupling agent with a mercapto group was particularly effective. The decay of electro-conductivity over time caused by oxygen can be almost completely averted by use of coupling agent.

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