Hostname: page-component-586b7cd67f-l7hp2 Total loading time: 0 Render date: 2024-11-25T15:50:42.052Z Has data issue: false hasContentIssue false
  • English
  • Français

Surface Potentials of Conjugated Molecules on Metal Surfaces: Measurements Using Electrostatic Force Microscopy and Calculations using a Preliminary Physically-Based Model.

Published online by Cambridge University Press:  17 March 2011

S. Howell ,
D. Kuila ,
A. W. Ghosh ,
T. Rakshit ,
H. McNally ,
D. Janes ,
S. Datta ,
B. Kashibhatla ,
C. Kubiak  and
R. Reifenberger
S. Howell
Affiliation:
Department of Physics, Purdue University, W. Lafayette, IN 47907, USA
D. Kuila
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
A. W. Ghosh
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
T. Rakshit
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
H. McNally
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
D. Janes
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
S. Datta
Affiliation:
School of Electrical and Computer Engineering, Purdue University, W. Lafayette, IN 47907, USA
B. Kashibhatla
Affiliation:
University of California, San Diego, Department of Chemistry and Biochemistry, La Jolla CA, 92093, USA
C. Kubiak
Affiliation:
University of California, San Diego, Department of Chemistry and Biochemistry, La Jolla CA, 92093, USA
R. Reifenberger
Affiliation:
Department of Physics, Purdue University, W. Lafayette, IN 47907, USA
Get access

Abstract

The electrostatic surface potential of self-assembled monolayers (SAMs) of aliphatic and aromatic thiols has been measured using electrostatic force microscopy. The variation of the surface potential of chemisorbed alkanethiols, with respect to bare Au(111), is observed to increase with increasing chain length. The trend is similar to that observed in the literature. A preliminary theoretical model, based on treating the monolayer as a sheet of dipoles, has been used to calculate the surface potential of alkanethiols. Similar measurements on several aromatic thiols, with a symmetric and non-symmetric molecular structure, reveal that non-symmetric systems have significantly higher potential (≥ 170mV) than the symmetric molecules.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 636: Symposium D – Nonlithographic and Lithographic Methods of Nanofabrication-From Ultralarge Scale , 2000 , D9.38.1
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Bain, C.D., Troughton, E. B., Tao, Y., Evall, J., Whitesides, G. M., and Nuzzo, R. G., J. Am. Chem. Soc. 111, 321 (1989).Google Scholar
[2] Porter, M. D., Bright, T. B., and Allara, D. L., J. Am. Chem. Soc. 109, 3559 (1987).Google Scholar
[3] Joachim, C., Gimzewski, J. K., and Aviram, A., Nature 408, 541 (2000).Google Scholar
[4] Craighead, H. G., Science 290, 1532 (2000).Google Scholar
[5] Piner, R. D., Zhu, J., Xu, F., Hong, S., and Mirkin, C., Science 283, 661 (1999).Google Scholar
[6] Quake, S. R. and Scherer, A., Science 290, 1536 (2000).Google Scholar
[7] Ulman, A., Chem. Rev. 96, 1533 (1996).Google Scholar
[8] Hong, S., Bielefeld, J., Andres, R. P., and Reifenberger, R., in Nanowires, edited by Serena, P. and Garcia, N., pages 351–72, Kluwer Academic, Dordrecht, 1997.Google Scholar
[9] Hong, S., Reifenberger, R., Tian, W., Datta, S., Henderson, J., and Kubiak, C. P., Superlatices and Microstructures 28, 289 (2000).Google Scholar
[10] Nanotec™, Universidad Autonoma de Madrid (Spain).Google Scholar
[11] ThermoMicroscopes™, Non-Contact Ultravers (ULNC-AUHW).Google Scholar
[12] Nonnenmacher, M., O'Boyle, M. P., and Wickramasinghe, H. K., Appl. Phys. Let. 58, 2921 (1991).Google Scholar
[13] Leng, Y. et al. , Appl. Phys. Let. 66, 1264 (1995).Google Scholar
[14] Jacobs, H. O., Leuchtmann, P., Homan, O. J., and Stemmer, A., J. Appl. Phys. 84, 1168 (1998).Google Scholar
[15] Evans, S. D. and Ulman, A., Chem. Phys. Lett. 170, 462 (1990).Google Scholar
[16] Lu, J., Delamarche, E., Eng, L., Bennewitz', R., Meyer, E., and Guntherodt, H., Langmuir 15, 8184 (1999).Google Scholar
[17] Lu, J., Eng, L., Bennewitz'w, R., Meyer, E., Guntherodt, H., Delamarche, E., and Scandelln, L., Surf. Interface Anal. 27, 368 (1999).Google Scholar
[18] Frisch, J. et al. , Gaussian 98, Revision A.7, and Gaussian Inc., Pittsburgh,(1998).Google Scholar
[19] Hay, P. J. and Wadt, W. R., J. Chem. Phys. 82, 270 (1985); Gaussian 98, Revision A.7, and Gaussian Inc., Pittsburgh,, 284 (1985)Google Scholar
[20] Howell, S. et al. , manuscript in preparation.Google Scholar