Pulsed laser deposition (PLD) was employed to grow MoS x –WSe y composite films, where x = 1.18, y = 0.78. Scanning electron micrographs show that the films have a dense granular morphology. Crystallization, d-spacing and hexagonal sheet curvature within the film were studied with X-ray diffraction, electron diffraction and transmission electron microscopy. A predominant hexagonal MoS x phase was formed but contained W and Se, which were most likely present as substituents for Mo and S. There was no evidence for two separate crystalline phases. MoS x –WSe y composite films exhibited a larger expansion along the c-axis (d-spacing between basal planes) than PLD MoS2 and WSe2 films grown by laser ablation of pure targets. The lattice spacing along the a-axis was expanded in comparison to the MoS2 film, and compressed in comparison to the WSe2 film. X-ray photoelectron spectroscopy showed a significant sulfur deficiency, and verified both of S and Se bonding in the film. High-resolution electron microscope images exhibited significant curvatures of the (002) basal planes in the films. The bending behavior of basal planes was explained by S vacancies and Se substitution on the atomic site of S layers. The tribological properties of the composite films were measured in dry and wet conditions using a ball-on-disc tribometer. The reduced friction was correlated with the increased crystallinity and increased separation of basal planes in the composite films.
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References
A. R. Lansdown, Molybdenum Disulphide Lubrication, D. Dowson ed. (Elsevier, Amsterdam, 1999).
A.J. Haltner, C.S. Oliver, Nature, 188 (1960) 308
S.F. Calhoun, F.S. Meade, G.P. Murphy, R.L. Young, Lubric. Eng. 21 (1965) 97
R.P. Pardee, ASLE Trans. 15 (1972) 130
M.T. Lavik R.D. Hubbell B.D. McConnell, Lubric. Eng. 31 (1975) 20
P.W. Centers, Wear, 122 (1988) 97
P.W. Centers, Trib. Trans. 31 (1988) 149
C.J. Klenke, Trib. Intl. 23 (1990) 23
J.S. Zabinski, M.S. Donley, V.J. Dyhouse, N.T. McDevitt, Thin Solid Films, 214 (1992) 156.
J.S. Zabinski, M.S. Donley, S.D. Walck, T.R. Schneider, N.T. McDevitt, Tribol. Trans. 38 (1995) 894
B.C. Stupp, Thin Solid Films, 84 (1981) 257.
T. Spalvins, Thin Solid Films, 118 (1984) 375.
M.R. Hilton, R. Bauer, S.V. Didziulis, M.T. Dugger, J.M. Keem, J. Scholhamer, Surf. Coat. Technol. 53 (1992) 13.
K.J. Wahl, L.E. Seitzman, R.N. Bolster, I.L. Singer, Surf. Coat. Technol. 73 (1995) 152
D.G. Teer, J. Hampshire, V. Fox, V. Bellido-Gonzalez, Surf. Coat. Technol. 94–95 (1997) 572
M.C. Simmonds, A. Savan, E. Pfluger, H. Van Swygenhoven, Surf. Coat. Technol. 126 (2000) 15
A. Savan, H. Haefke, M.C. Simmonds, C.P. Constable, J. Vac. Sci. Technol. A 20 (2002) 1682
V. Buck, Wear, 91 (1983) 281.
H. Dimigen, H. Hubsch, P. Willich, K. Reichelt, Thin Solid Films, 129 (1985) 79
C. Muller, C. Menoud, M. Maillat, H.E. Hintermann, Surf. Coat. Technol. 36 (1988) 351
J. Moser, F. Levy, Thin Solid Films, 228 (1993) 257.
J.L. Grosseau-Poussard, H. Garem, P. Moine, Surf. Coat. Technol. 78 (1996) 19
M. Regula, C. Ballif, J.H. Moser, F. Levy, Thin Solid Films, 280 (1996) 67
W. Lauwerens, J. Wang, J. Navratil, E. Wieers, J. D’haen, L.M. Stals, J.P. Celis, Y. Bruynseraede, Surf. Coat. Technol. 131 (2000) 216
P.D. Fleischauer, J.R. Lince, P.A. Bertrand, R. Bauer, Langmuir, 5 (1989) 1009.
P.D. Fleischauer, J.R. Lince, Tribol. Int., 32 (1999) 627.
M.S. Donley, P.T. Murray, S.A. Barber, T.W. Haas, Surf. Coat. Technol. 36 (1988) 329.
J.S. Zabinski, M.S. Donley, P.J. John, V.J. Dyhouse, A.J. Safriet N.T. McDevitt, Mat. Res. Soc. Symp. Proc. 201 (1991) 195.
V.Yu. Fominskii, A.M. Markeev, V.N. Nevolin, Vacuum, 42 (1991) 73
V.Yu. Fominskii V.N. Nevolin R.I. Romanov I. Smurov, J. Appl. Phys., 89 (2001) 1449.
Pulsed Laser Deposition of Thin Films, ed. D.B. Chrisey and G.K. Hubler (Wiley-Interscience, New York, 1994)
JCPDS Powder Diffraction File, International Center for Powder Diffraction Data, Swarthmore, PA, 1998, PDF Card#37–1492
JCPDS Powder Diffraction File, International Center for Powder Diffraction Data, Swarthmore, PA, 1998, PDF Card#08–0237
JCPDS Powder Diffraction File, International Center for Powder Diffraction Data, Swarthmore, PA, 1998, PDF Card#29–0914
JCPDS Powder Diffraction File, International Center for Powder Diffraction Data, Swarthmore, PA, 1998, PDF Card#38–1388
JCPDS Powder Diffraction File, International Center for Powder Diffraction Data, Swarthmore, PA, 1998, PDF Card#06–0696
NIST X-ray Photoelectron Spectroscopy Database, Version 3.4, copy right by the U.S. Secretary of Commerce on behalf of the U.S.A., 2003
Lange’s Handbook of Chemistry, ed. J.A. Dean, 13th ed (McGraw-Hill Book Company, New York, 1985)
N. Takahashi, M. Shiojiri, S. Enomoto, Wear, 146 (1991) 107
D.N. Dunn, L.E. Seitzman, I.L. Singer, J. Mater. Res. 12 (1997) 1191
D.N. Dunn, L.E. Seitzman, I.L. Singer, J. Mater. Res., 13 (1998) 3001.
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The Air Force Office of Scientific Research (AFOSR) is gratefully acknowledged for financial support. Thanks to Dr. J.T. Grant and B. Philips for helpful discussion and assistance on XPS.
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Hu, J., Zabinski, J., Bultman, J. et al. Structure characterization of pulsed laser deposited MoS x –WSe y composite films of tribological interests. Tribol Lett 24, 127–135 (2006). https://doi.org/10.1007/s11249-006-9063-2
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DOI: https://doi.org/10.1007/s11249-006-9063-2