Structure Model Of DLC Film

Structure model of DLC film

The DLC film is in a thermodynamic non-equilibrium state, and its atomic arrangement shows the characteristics of short-range order and long-range disorder. Short-range order is mainly manifested in the structure of sp3 and sp2 hybrid bonds between C-C atoms.
The first model was proposed by Beeman et al., who constructed three models of amorphous carbon films with different sp3 and sp2 hybrid carbon atom contents. This model has two typical features: First, except for the sp2 hybrid structure model, all models correspond to relatively isotropic disordered chaotic network structure, and there is no internal suspension bond; Secondly, all the models are relaxed to minimize the strain energy caused by the bond length and bond angle deviating from the crystalline state.
The second model is the completely suppressed random network model, which was proposed and refined by Phillips et al. The basic idea of the model is that in an amorphous random covalent network, the structure is completely suppressed when the average number of atoms suppressed is equal to the mechanical degrees of freedom of the atoms. Increasing the coordination number can generate more covalent bonds and reduce the system capacity, which can stabilize the solid-state network structure, but the bond stretching and bond Angle deformity will cause more strain energy.

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