AVS 50th International Symposium
    Biomaterial Interfaces Wednesday Sessions
       Session BI-WeP

Paper BI-WeP3
Adsorption Kinetics of Alkanethiol Self-Assembly on Hydrogenated Ge(111)

Wednesday, November 5, 2003, 11:00 am, Room Hall A-C

Session: Poster Session
Presenter: M.R. Kosuri, University of New Mexico
Authors: M.R. Kosuri, University of New Mexico
R. Cone, University of New Mexico
Q. Li, University of New Mexico
S.M. Han, University of New Mexico
C.B. Bunker, Sandia National Laboratories
T.M. Mayer, Sandia National Laboratories
Correspondent: Click to Email
We have investigated in situ and in real-time the liquid-phase self-assembly of 1-alkanethiols on hydrogenated Ge(111), using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIRS). The water contact angle measurements on thiolated Ge demonstrate that the final packing density is a function of both alkanethiol concentration in 2-propanol and the chain length of thiolate molecules. The absolute saturation coverage of 1-hexadecanethiol is approximately 4.2x10@sup 14@ cm@sup -2@ based on the IR absorbance of C-H stretching vibrational modes near 2900 cm@sup -1@. We also report the adsorption rate constant of 0.1 M 1-hexadecanethiol on hydrogenated Ge(111) at room temperature. The rate constant is 2.1 ± 0.6 cm@sup 3@/mol-sec, based on a Langmuir isotherm.