Effect of oxide layers of Ni-free stainless-steel on silane coupling agent immobilization

Masaru Soya, Tomohiko Yoshioka, Kazuo Shinozaki, Junzo Tanaka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This study is concerned with the characterization of oxide layers formed on Ni-free stainless-steel and the immobilization of a silane coupling agent, i.e. γ-aminopropyltriethoxysilane (APS). The Ni-free stainless-steel was oxidized at three different temperatures, 800 K, 1000 K and 1200K in air, and then the APS molecules were immobilized on the surface at room temperature. The surface of the samples was characterized by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The composition of surface oxides formed through the oxidizing treatment was identified to be two types of oxide, namely Fe2O3 and Cr2O3. The atomic ratio of Cr to Fe+Cr increased with an increase in the oxidizing temperature. The amounts of APS immobilized on each surface followed the sequence of 1200K < 1000K < 800 K of the oxidizing temperature. It was found that the surface oxide formed at 800 K is the best carrier of APS under these conditions. It is apparent that Fe2O3 is more easily fixed by APS than Cr2O3.

Original languageEnglish
Pages (from-to)1318-1321
Number of pages4
JournalMaterials Transactions
Issue number6
Publication statusPublished - Jun 2009
Externally publishedYes


  • Depth profile
  • Nickel-free stainless-steel
  • Silane coupling agent
  • Surface oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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