Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Pretreatment and Ag Coating Processes Conditions on the Properties of Ag-Coated Cu Flakes

Ag 코팅 Cu 플레이크의 제조에서 전처리 및 Ag 코팅 공정 변화의 효과

  • Kim, Ji Hwan (Department of Materials Science & Engineering, Seoul National University of Science & Technology) ;
  • Lee, Jong-Hyun (Department of Materials Science & Engineering, Seoul National University of Science & Technology)
  • 김지환 (서울과학기술대학교 신소재공학과) ;
  • 이종현 (서울과학기술대학교 신소재공학과)
  • Received : 2014.10.09
  • Accepted : 2014.10.13
  • Published : 2014.11.27
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Abstract

To elucidate the effects of a pretreatment process on the uniformity of Ag electroless plating on Cu flakes, pretreatment time was mainly considered with a mixed solution of 0.15 M ammonium hydroxide and 0.0375 M ammonium sulphate. Optical inspection of Ag-coated Cu flakes determined that the optimal pretreatment time is 120 s. Repetition of the sequence in which Ag plating was done immediately after the pretreatment of 120 s clearly enhanced the plating uniformity. Scanning electron microscopy revealed that holes were formed irregularly on some Cu flakes during the period from the asdropping of an Ag precursor solution to 5 min. The hole formation was judged to be due to continuous removal of Cu on the local surfaces by the repetitive formation and elimination of $Cu_2O$ or $Cu(OH)_2$ layers. However, the increase of the amount of Ag coating suppressed the hole creation and increasingly enhanced the antioxidant property.

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