Mixed self-assembled monolayers of highly polar rigid biphenyl thiols

Langmuir

Volumn 15, Issue 6, 1999, Pages 2095-2098

  Kang, Jung F ^a   Ulman, Abraham ^a   Liao, Sheng ^a   Jordan, Rainer ^a  

^a POLYTECHNIC UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

COMPOSITION; COMPUTATIONAL METHODS; FOURIER TRANSFORM INFRARED SPECTROSCOPY; MONOLAYERS; ORGANIC SOLVENTS; PERMITTIVITY; TOLUENE;

BIPHENYL THIOL; DIPOLE MOMENT; HAMMETT EQUATION; SELF-ASSEMBLED MONOLAYERS;

SULFUR COMPOUNDS;

EID: 0345404112     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la9813883     Document Type: Article

References (13)

1. For a review on SAMs of thiols on gold see: (a) Ulman, A. An Introduction to Ultrathin Organic Films: From Langmuir-Blodgett to Self-Assembly, Academic Press: Boston, MA, 1991. (b) Ulman, A. Chem. Rev. 1996, 96, 1533.
2. For a review on SAMs of thiols on gold see: (a) Ulman, A. An Introduction to Ultrathin Organic Films: From Langmuir-Blodgett to Self-Assembly, Academic Press: Boston, MA, 1991. (b) Ulman, A. Chem. Rev. 1996, 96, 1533.
3. Kang, Jung F.; Ulman, Abraham; Liao, Sheng; Jordan, Rainer J. Am. Chem. Soc. 1998, 120, 9662.
4. Kang, Jung F.; Jordan, Rainer; Ulman, Abraham Langmuir 1998, 14, 3983.
5. Glass slides were baked overnight in a vacuum (10B7 Torr) at 300°C. Gold (99.99%) evaporation was carried out at the same temperature, using a constant deposition rate of 3 Å/s, followed by annealing for 18 h. X-ray studies show that these gold substrates have (111) surfaces. Reproducible ellipsometric constants for gold substrates prepared according to this procedure are NS = 0.186 ± 0.01, and KS = 3.400 ± 0.05. Using these gold substrates, SAMs of biphenyl thiols show contact angle hysteresis of ∼5°. In comparison, the same SAMs on gold substrates prepared at room temperature without annealing show a contact angle hysteresis of ∼20°.
6. Thickness was estimated by ellipsometry, using a Rudolph Research AutoEL ellipsometer (He-Ne laser; angle of incidence 70°). Measurements of three separate points were carried out on each sample, using an assumed refractive index of 1.462.
7. -1. The spectra of bulk samples were collected over 200 scans.
8. Handbook of Chemistry and Physics; 75th ed.; Lide, D. R., Ed.; CRC Press: Boca Roton, FL, 1985.
9. March, J. Advanced Organic Chemistry, 3rd edl; Mcgraw-Hill: New York, 1985, p 244.
10. Ulman A. J. Phys. Chem. 1988, 92, 2385.
11. Gordon, A. J.; Ford, R. A. The Chemist's Companion; Wiley-Interscience: New York, 1972; p 146.
12. Debye, P. The Dipole Moment and Chemical Structure; Blackie & Son Limited: London and Glasgow, 1931.
13. Debe, M. K. Appl. Surf. Sci. 1982, 14, 1.