Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Nano Adhesion and Friction of $DDPO_4$ and $ODPO_4$ SAM Coatings

$DDPO_4$와 $ODPO_4$SAM 코팅의 나노 응착 및 마찰 특성 연구

  • ;
  • ;
  • ;
  • Andrei Ya Grigoriev (Tribology Laboratory, Metal Polymer Research Institute, Gomel, Belarus)
  • 윤의성 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 양승호 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 공호성 (한국과학기술연구원 트라이볼로지연구센터) ;
  • Published : 2002.08.01
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Abstract

Nano adhesion between SPM(scanning probe microscope) tips and DDPO$_4$(octadecylphosphoric acid ester.) and ODPO$_4$(octadecylphosphoric acid ester) SAM(self-assembled monolayer.) was experimentally studied. Tests were performed to measure the nano adhesion and friction in both AFM(atomic force microscope) and LFM(lateral force microscope) modes with the applied normal load. DDPO$_4$ and ODPO$_4$ SAM were formed on Ti and TiOx surfaces. Ti and TiOx were coated on the Si wafer by ion sputtering. Adhesion and friction of DDPO$_4$ and ODPO$_4$ SAM surfaces were compared with those of OTS(octadecyltrichlorosilane) SAM and DLC surfaces. DDPO$_4$ and ODPO$_4$ SAM converted the Ti and TiOx surfaces to be hydrophobic. When the surface was hydrophobic, the adhesion and friction forces were found lower than those of bare surfaces. Work of adhesion was also discussed to explain how the surface was converted into hydrophobic Results also showed that tribological characteristics of DDPO$_4$ and ODPO$_4$ SAM had good properties in the adhesion, friction, wetting angle and work of adhesion. DDPO$_4$ and ODPO$_4$ SAM could be one of the candidates for the bio-MEMS elements.

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References

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