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Hydrophobicity and Nanotribological Properties of Silicon Channels coated by Diamond-like Carbon Films 원문보기

KSTLE international journal, v.10 no.1/2, 2009년, pp.1 - 5  

Pham, Duc Cuong (Nano-Bio Research Center, Korea Inst. of Sci. and Technol.) ,  Na, Kyung-Hwan (Dept. of Mech. Eng., Hanoi Univ. of Technol.) ,  Pham, Van Hung (Dept. of Mech. Eng., Hanoi Univ. of Technol.) ,  Yoon, Eui-Sung (Nano-Bio Research Center, Korea Inst. of Sci. and Technol.)

Abstract AI-Helper 아이콘AI-Helper

This paper reports an investigation on nanotribological properties of silicon nanochannels coated by a diamond-like carbon (DLC) film. The nanochannels were fabricated on Si (100) wafers by using photolithography and reactive ion etching (RIE) techniques. The channeled surfaces (Si channels) were th...

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제안 방법

  • All experiments were conducted in a clean room, at controlled temperature of 24±1o C and relative humidity of 45±5%, respectively.
  • The adhesion force (pull-off force) was calculated based on the acquired force curves and the average value was presented. Friction tests were carried out in lateral force microscope mode (LFM) [10], in the direction that across to the length of the channels. Before the friction measurements, the cantilever was calibrated for a conversion factor that allows converting lateral deflection signals directly into friction force, using the method described by Ruan and Bhushan [10].
  • In order to observe the effect of scale-dependence on adhesion and friction of the patterned surface, measurements were carried out using two different tips with diameter of 5 µm and 10 µm.
  • In this study, we investigate the effects of a combination of two kinds of surface modifications, namely silicon channels overcoated by DLC films, on hydrophobicity and nanotribological properties of silicon surfaces.

이론/모형

  • Water contact angle (WCA) of the modified and unmodified surfaces was examined by using a contact anglemeter (S.E.O) and sessile-drop method. For the channels, WCA was measured in two directions that are parallel and perpendicular to the channels.
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참고문헌 (16)

  1. Bhushan, B., Tribology Issues and Opportunities in MEMS, pp. 85, Kluwer Academic Publishers, Dordrecht, Netherlands, 1998 

  2. Bhushan, B., Springer Handbook of Nanotechnology, pp.983, Springer-Verlag, Berlin, Heidelberg, 2004 

  3. Yoon, E.-S., Singh, R. A., Oh, H. J, Kong, H., 'The effect of contact area on nano/micro-scale friction,' Wear, Vol. 259, pp.1424-1431, 2005 

  4. Kasai, T., Bhushan, B., Kulik, G., Barbieri, L., Hoffmann, P., 'Micro/nanotribological study of perfluorosilane SAMs for antistiction and low wear,' J. Vac. Sci. Technol. B, Vol. 23, pp. 995-1003, 2005 

  5. Robertson, J., 'Diamond-like amorphous carbon,' Materials Science and Engineering, R37, pp. 129-281, 2002 

  6. Pham, D. C., Ahn, H.-S., Oh, J.-E., Yoon, E.-S., 'Tribochemical Interactions of Si-doped DLC Film Against Steel in Sliding Contact,' J. Mech. Sci. Technol., Vol. 21, pp.1083-1089, 2007 

  7. Yoon, E. -S., Singh, R. A., Kong, H., Kim, B., Kim, D. -H., Jeong, H. E., and Suh, K. Y., 'Tribological properties of biomimetic nano-patterned polymeric surfaces on silicon wafer,' Tribology Letters, Vol. 21, pp. 31-37, 2006 

  8. Pham, D. C., Singh, R. A., Yoon, E.-S., 'Dual Surface Modifications of Silicon Surfaces for Tribological Application in MEMS,; KSTLE International Journal, Vol. 8, pp. 26-28, 2007 

  9. Marchetto, D., Rota, A., Calabri, L., Gazzadi, G. C. Menozzi, C., Valeri, S., 'AFM investigation of tribological properties of nano-patterned silicon surface,' Wear , Vol. 265, pp. 577-582, 2008 

  10. Bhushan, B., Handbook of Micro/Nano Tribology, 2^{nd} ed., pp.3-80, CRC Press, Boca Raton, 1999 

  11. Beake, B. D., Leggett, G. J., 'Variation of Frictional Forces in Air with the Compositions of Heterogeneous Organic Surfaces,' Langmuir, Vol.16, pp. 735-739, 2000 

  12. Zhao, Y., Lu, Q., Li, M., Li, Xin.,'Anisotropic Wetting Characteristics on Submicrometer-Scale Periodic Grooved Surface,' Langmuir, Vol. 23, pp. 6212-6217, 2007 

  13. Wenzel, R. N., 'Resistance of solid surfaces to wetting by water,' Ind. Eng. Chem., Vol. 28, pp. 988-994, 1936 

  14. Cassie, A. B. D., and Baxter, S., 'Wettability of porous surfaces,' Trans. Faraday. Soc., Vol. 40, pp. 546-551, 1944 

  15. Johnson, K. L., Kendall, K., Roberts, A. D., 'Surface energy and contact of elastic solid,' Proc. Roy. Soc. Lond. A Mater., Vol. 321, pp. 301-313, 1971 

  16. Bowden, F. P., Tabor, D., The friction and Lubrication of Solids, pp. 90-121, Clarenden Press., Oxford, 1950 

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