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Self-assembled monolayers (SAMs) are molecular layers that assemble on a surface by adsorption, usually from solution. Their formation is mediated by a specific functional group that has a strong affinity for a particular surface. SAMs have been used for studies and applications in many areas. A few examples include surface wetting, non-fouling property, electrochemistry, surface passivation, protein binding, DNA assembly, corrosion resistance, biological arrays, cell interactions, and molecular electronics.