Molecular Dynamic Simulations of Self-Assembled Alkylthiolate Monolayers on an Au(111) Surface
2004; American Chemical Society; Volume: 20; Issue: 8 Linguagem: Inglês
10.1021/la0357256
ISSN1520-5827
AutoresBeena Rai, P. Sathish, Chetan P. Malhotra, Pradip, K. G. Ayappa,
Tópico(s)Advanced biosensing and bioanalysis techniques
ResumoMolecular dynamics simulations incorporating explicit gold atoms in the simulations have been carried out for alkanethiol self-assembled monolayers chemisorbed on the Au(III) surface. The structural properties of the monolayer are evaluated for two force fields: one in which the Au--S--C bond is fixed (FF I), and the other in which it is flexible (FF II). The influence of these force fields on the structural properties of HS(CH2)14CH3 on the structured Au surface is compared at different temperatures. FF I yields greater tilt angles and a smaller film thickness when compared with FF II. Both of the force fields predict that the tilt angles do not follow a monotonic decrease with temperature but show minima around 200 K. Simulations carried out at different chain lengths at 300 K reveal that FF II predicts a greater film thickness than FF I; however, the difference is within 1 A.
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