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welcome my name is Carrie Donnelly and Iamp;#39;m the director of The Chapel Hill analytical and Nano fabrication lab or Channel at UNC today we will be talking about x-ray photoelectron spectroscopy or XPS which can tell us about the surfaces of samples if youamp;#39;ve ever seen rust youamp;#39;ve seen evidence of surface chemistry when iron is exposed to the atmosphere the surface iron atoms will react with water and oxygen to form iron oxide or rust often the surface of a material is very different from the bulk steel is a very strong durable material but the rust that forms on its surface breaks very easily therefore understanding surface chemistry is important especially for nanoparticles as the size of a material decreases a larger percentage of the atoms are found at the surface when working with nanoparticles the properties of the material can be dominated by the surface properties the nanoparticle shown here has a total of 147 atoms and 62 percent of them are at the surfac
