Nanolayers

Nanolayer coatings Nanolithography Nanomaterials Nanometer composites Nanoparticles Nanostrip Nanotechnology Nantokite [14708-85-1] Nantokite [14708-8517] NaOH... 

The number of material systems that can be used for nanolayer coatings is vktuaHy unHmited. Any refractory hard material can be used as the hard material compatible metal can be used as the tough material. Examples of material systems for nanocoatings include the foUowing ... 

Nanolayers of clay interacting with polymers to form nanocomposites with improved material properties relative to the untreated polymer are discussed in Chapter 17. 

Since the main topic of this review is STM imaging, growth properties, surface morphology, and atomic structures of oxide nanosystems are the central themes. Oxide nanolayers on noble metal surfaces often display very complex structural arrangements, as illustrated in the following sections. The determination of the surface structure of a complex oxide nanophase by STM methods is, however, by no means trivial resolution at the atomic scale in STM is a necessary but not sufficient condition for elucidating the atomic structure of an oxide nanophase. The problem... 

The structure of the review is organized as follows. In Section 6.2, we will address experimental aspects concerning apparatus developments and oxide nanolayer preparation methods, and briefly comment on the interplay between experimental and theoretical results. Section 6.3 constitutes the main body of this chapter, where we present case studies of selected oxide-metal systems. They have been chosen according to their prototypical oxide nanosystem behavior and because of their importance in catalysis. We conclude with a synopsis and a brief outlook speculating on future developments. 

In summary, the alumina nanolayers formed by the high-temperature oxidation on NiAl alloy surfaces are structurally and chemically very different from the bulk-terminated surfaces of the various A1203 phases, and they thus provide very prototypical examples of oxide phases with novel emergent properties because of interfacial bonding and thickness confinement effects. 

We refrain here from giving an extensive overview of studies on the surface structure of vanadium oxide nanolayers, as this has already been done for up to year 2003 in our recent review [97]. Instead, we would like to focus on prototypical examples, selected from the V-oxide-Rh(l 1 1) phase diagram, which demonstrate the power of STM measurements, when combined with state-of-the-art DFT calculations, to resolve complex oxide nanostructures. Other examples will highlight the usefulness of combining STM and STS data on a local scale, as well as data from STM measurements, and sample area-averaging spectroscopic techniques, such as XPS and NEXAFS, to derive as complete a picture as possible of the investigated system. 

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