Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Formation Mechanism of Mesoporous Aluminum Hydroxide Film by Alkali Surface Modification

알칼리 표면개질을 통한 메조포러스 알루미늄 하이드록사이드 필름 형성 기구

  • Seo, Young-Ik (Division of Materials Science and Engineering, Hanyang University) ;
  • Jeon, Yong-Jin (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Young-Jung (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Dae-Gun (Division of Materials Science and Engineering, Hanyang University) ;
  • Lee, Kyu-Hwan (Computational Science Center, Korea Institute of Science and Technology) ;
  • Kim, Young-Do (Division of Materials Science and Engineering, Hanyang University)
  • 서영익 (한양대학교 신소재공학부) ;
  • 전용진 (한양대학교 신소재공학부) ;
  • 이영중 (한양대학교 신소재공학부) ;
  • 김대건 (한양대학교 신소재공학부) ;
  • 이규환 (한국과학기술연구원) ;
  • 김영도 (한양대학교 신소재공학부)
  • Published : 2010.02.27
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Abstract

In this study, a new, relatively simple fabrication method for forming a mesoporous $Al(OH)_3$ film on Al substrates was demonstrated. This method, i.e., alkali surface modification, was simply comprised of dipping the substrate in a $5\times10^{-3}$ M NaOH solution at $80^{\circ}C$ for one minute and then immersing it in boiling water for 30 minutes. After alkali surface modification, a mesoporous $Al(OH)_3$ film was formed on the Al substrate, and its chemical state and crystal structure were confirmed by XPS and TEM. According to the results of the XPS analysis, the flake-like morphology after the alkali surface modification was mainly composed of $Al(OH)_3$, with a small amount of $Al_2O_3$. The mesoporous $Al(OH)_3$ layer was composed of three regions: an amorphousrich region, a region of mixed amorphous and crystal domains, and a crystalline-rich region near the $Al(OH)_3$ layer surface. It was confirmed that the stabilization process in the alkali surface modification strongly influenced the crystallization of the mesoporous $Al(OH)_3$ layer.

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