Molecular Dynamics Simulations of the Chemical Modification of Polystyrene through CxFy Beam Deposition
نویسندگان
چکیده
The chemical modification of polystyrene through the deposition of a beam of polyatomic fluorocarbon ions (C3F5 and CF3) at experimental fluences is studied using classical molecular dynamics simulations with many-body empirical potentials. To facilitate these simulations, a new C-H-F potential is developed on the basis of the second-generation reactive empirical bond-order potential for hydrocarbons developed by Brenner. Lennard-Jones potentials are used to model long-range van der Waals interactions. The incident energy of the ion beam is 50 eV/ion, and it is deposited normal to the surface. The simulations illustrate the important differences in the chemical interactions of these polyatomic ions with the polystyrene. The CF3 ions are predicted to be more effective at fluorinating the polystyrene than C3F5 ions, and the dissociation of the C3F5 ions produce long-lived precursors to fluorocarbon thin film nucleation.
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