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Organic-inorganic hybrid materials have been widely studied during the past two decades. The capability to combine materials which are completely different has expanded the number of new materials with unique properties that are possible to synthesize. Thus, hybrid materials are nanocomposites where at least one of the components has a domain size of at least several nm [Sanchez, 1994]. In 1985, the first hybrid material was synthesized by the sol-gel process, combining alkoxides with organic monomers or oligomers leading to a hybrid network [Huang et al., 1985; Schmidt, 1985]. At this respect, sol-gel is a feasible, simple and low-cost technique. The hybrid materials obtained are polydisperse in size and locally heterogeneous in chemical composition [Sanchez et al., 2005]. These hybrids are also inexpensive, versatile and present many interesting applications converting them into makertable products as films, powders or monoliths. Among the wide variety of hybrid materials, SiO2-Poly(methylmethacrylate) (SiO2-PMMA), hybrids have shown interesting properties as higher hardness than some common thermoplastics like poly(methyl methacrylate), poly(ethylene terpththalate) and poly(ethylene naphthalate); low surface roughness; low friction coefficient; and high optical transparency. These properties are attractive to be applied as protective coatings as well as in the fabrication of electronic devices on flexible substrates like OLED’s used as both planarization and insulator coatings. Plastic surface roughness lower than 2 nm are required in order to start deposition of ceramic films to assemble the device. This ultra-smooth surface can be achieved by hybrid coatings due to the combination of components at a molecular level. Moreover, SiO2-PMMA hybrids are flexible, a property conferred by the organic component, and thus they can undergo higher deformations before cracking if applied on plastic substrates.

Elastic and Nanowearing Properties of SiO2-PMMA and Hybrid Coatings Evaluated by Atomic Force Acoustic Microscopy and Nanoindentation"