TY - GEN
T1 - Molecular mechanics and dynamics studies of chemisorbed monolayers of alkanethiolates
AU - Shnidman, Yitzhak
AU - Eilers, James E.
AU - Ulman, Abraham
AU - Sellers, Harrell
PY - 1993
Y1 - 1993
N2 - We study ordering within closely packed monolayers of thiol derivatives self-assembled on gold substrates by chemisorption from solution. We discuss constant stress molecular mechanics and dynamics simulations of alkanethiolate monolayers on Au(111) and Au(100) surfaces. In the first case, we use the MM2 force field augmented with classical chemisorption parameters obtained from fitting to results of ab initio quantum mechanical calculations. In the second, the chemisorption to the Au(100) surface was accomplished by using harmonic constraints to restrict the thiolate groups to the square lattice. It is shown that two chemisorption modes of alkanethiolate on Au(111) exist, and that both give closely packed ordered monolayers. In the system on Au(100), rearrangement towards close-packing is achieved at the expense of distortions that increase the intrachain elastic energy.
AB - We study ordering within closely packed monolayers of thiol derivatives self-assembled on gold substrates by chemisorption from solution. We discuss constant stress molecular mechanics and dynamics simulations of alkanethiolate monolayers on Au(111) and Au(100) surfaces. In the first case, we use the MM2 force field augmented with classical chemisorption parameters obtained from fitting to results of ab initio quantum mechanical calculations. In the second, the chemisorption to the Au(100) surface was accomplished by using harmonic constraints to restrict the thiolate groups to the square lattice. It is shown that two chemisorption modes of alkanethiolate on Au(111) exist, and that both give closely packed ordered monolayers. In the system on Au(100), rearrangement towards close-packing is achieved at the expense of distortions that increase the intrachain elastic energy.
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M3 - Conference contribution
AN - SCOPUS:0027238991
SN - 1558991867
T3 - Materials Research Society Symposium Proceedings
SP - 211
EP - 216
BT - Materials Theory and Modelling
PB - Publ by Materials Research Society
T2 - Proceedings of the Materials Research Society Symposium
Y2 - 30 November 1992 through 3 December 1992
ER -