Molecular packing changes of alkanethiols monolayers on Au(111) under applied pressure

Journal of Chemical Physics

Volumn 113, Issue 6, 2000, Pages 2413-2418

  Barrena, E ^a   Ocal, C ^a   Salmeron, M ^b  

^a INSTITUTO DE CIENCIA DE MATERIALES DE MADRID   (Spain)

^b UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC FORCE MICROSCOPY; GOLD; GROWTH (MATERIALS); MATHEMATICAL MODELS; METALLIC FILMS; PRESSURE EFFECTS; SOLUTIONS;

ALKANETHIOLS MONOLAYERS; CHAIN INTERLOCK MODEL;

MONOLAYERS;

EID: 0034249895     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.482057     Document Type: Article

References (28)

1. Y. C. Chan and R. G. Horn, J. Chem. Phys. 83, 5311 (1985).
2. J. Van Alsten and S. Granick, Tribol. Trans. 32, 246 (1990).
3. J. B. Pethica and W. C. Oliver, Phys. Scr., T 19, 61 (1987).
4. B. Bhushan, J. Israelachvili, and U. Landman, Nature (London) 374, 607 (1994).
5. Forces in Scanning Probe Methods, NATO ANSI Series (Kluwer Academic, Dordrecht, The Netherlands, 1995).
6. R. W. Carpick and M. Salmeron, Chem. Rev. 97, 1163 (1997).
7. J. I. Siepmann and I. R. McDonald, Phys. Rev. Lett. 70(4), 453 (1993).
8. K. J. Tupper and D. W. Brenner, Langmuir 10, 2335 (1994).
9. K. J. Tupper, R. J. Colton, and D. W. Brenner, Langmuir 10, 2041 (1994).
10. S. A. Joyce, R. C. Thomas, J. E. Houston, T. A. Michalske, and R. M. Crooks, Phys. Rev. Lett. 68(18), 2790 (1992).
11. J. H. Teuscher, L. Y. Yeager, H. Yoo, J. E. Chadwick, and R. L. Garrell, Faraday Discuss. 107, 399 (1997).
12. E. Barrena, S. Kopta, D. F. Ogletree, D. H. Charych, and M. Salmeron, Phys. Rev. Lett. 82, 2880 (1999).
13. E. Barrena, C. Ocal, and M. Salmeron, J. Chem. Phys. 111, 9797 (1999).
14. P. Fenter, A. Eberhardt, and P. Eisenberger, Science 266, 1216 (1994).
15. G. J. Kluth, C. Carraro, and R. Maboudian, Phys. Rev. B 59, 10449 (1999).
16. W. F. Kolbe, D. F. Ogletree, and M. Salmeron, Ultramicroscopy 42-44. 369 (1992).
17. A. Würger, Phys. Rev. Lett. 83, 1696 (1999).
18. 2 with 5% of vacancy defects, we obtain that only 4% of the total area is involved in the process. This is a large area, however, since the contact area is 0.4% in this case.
19. The length of the molecules is estimated to be 24 Å, assuming bond angles of 110° for both the the Au-S-C and C-C-C and bond lengths 2.21 Å (Au-S from Ref. 28), 1.81 Å (S-C), 1.541 Å (C-C), and a contribution of 1.5 Å from the methyl group.
20. A. I. Kitaigorodskii, Organic Chemical Crystallography (Consultants Bureau, New York, 1961).
21. Tilt angles between 30°and 37° have been reported for monolayers of alkanethiols on gold depending on chain length and technique used.
22. P. Fenter, A. Eberhardt, K. S. Liang, and P. Eisenberger, J. Chem. Phys. 106, 1600 (1997).
23. NN = 3.3 Å).
24. A. Lio, C. Morant, D. F. Ogletree, and M. Salmeron, J. Phys. Chem. 101, 4767 (1997).
25. Preliminary results of surface grazing x-ray diffraction on C16 islands performed by the present authors agree with the value given here for the tilt angle and demonstrate that aged islands grown by the present procedure are single domain. (Work in progress.)
26. M. Liley, D. Gourdon, D. Stamou, U. Meseth, T. M. Fischer, C. Lautz, H. Stahlberg, H. Vogel, N. A. Burnham, and C. Duschl, Science 280, 273 (1998).
27. We have experimentally observed the presence of such domains (to be published). Lateral force data can be sensitive to this fact by showing friction anisotropy, as observed in the case of LB films (Ref. 26).
28. P. Fenter, F. Schreiber, L. Berman, G. Scoles, P. Eisenberger, and M. J. Bedzyk, Surf. Sci. 412/413, 213 (1998).