Planar metallic surfaces substrates

With the advent of synthetic methods to produce more advanced model systems (cluster- or nanoparticle-based systems either in the gas phase or on planar surfaces), we come to the modern age of surface chemistry and heterogeneous catalysis. Castleman and coworkers demonstrate the large influence that charge, size, and composition of metal oxide clusters generated in the gas phase can have on the mechanism of a catalytic reaction. Rupprechter (Chap. 15) reports on the stmctural and catalytic properties of planar noble metal nanocrystals on thin oxide support films in vacuum and under high-pressure conditions. The theme of model systems of nanoparticles supported on planar metal oxide substrates is continued with a chapter on the formation of planar catalyst based on size-selected cluster deposition methods. In a second contribution from Rupprecther (Chap. 17), the complexities of surface chemistry and heterogeneous catalysis on metal oxide films and nanostructures, where the extension of the bulk structure to the surface often does not occur and the surface chemistry is often dominated by surface defects, are discussed. 

Supported model catalysts are frequently prepared by thermally evaporating metal atoms onto a planar oxide surface in UHV. The morphology and growth of supported metal clusters depend on a number of factors such as substrate morphology, the deposition rate, and the surface temperature. For a controlled synthesis of supported model catalysts, it is necessary to monitor the growth kinetics of supported metal... 

Microcontact printing (pCP) is a technique that uses an elastomeric stamp with relief on its surface to generate patterned SAMs on the surface of both planar and curved substrates [87,88]. SAMs are highly ordered molecular assemblies that form spontaneously by chemisorption of functionalized long-chain molecules on the surfaces of appropriate substrates [79,89]. Well-established systems of SAMs include alkanethiolates on coinage metals (Au, Ag, Cu) [90] alkyl-siloxanes on hydroxyl-terminated surfaces (Si/Si02, glass) [91] carboxylic and... 

In flexible displays employing metal foil substrate, planarization is required to reduce the surface roughness of metal foil and electrically insulate TFT array from conductive metal foil. Spin-on glass (SOG) and spin-on polymer (SOP) were selected as planarization dielectric. 2... 

Hence, the capacitance of 1.2 and 2.1 nF/cm for SOG/SiNx and SOP/SiNx, respectively is allowable. Surface root-mean-square (RMS) roughness of bare metal foil was 110 rtm It improved to 12 and 10 nm after the planarization layer such as SOG/SiNx and SOP/SiNx was coated on the metal foil substrate, respectively. 

Self-assembled monolayers (SAMs) are highly ordered molecular assembUes that form spontaneously by chemisorption of functionalized molecules on surfaces, and organize themselves laterally, most commonly by van der Waals interactions between monomers [5]. We consider SAMs to be a type of two-dimensional polymer they are, in a sense, a uniform supramolecular assembly of short hydrocarbon chains covalently grafted onto a macromolecular entity, that is, the surface. In SAMs, individual monomers (usually linear alkyl chains functionalized at one end or both) are not directly linked by covalent bonds to each other, but rather to a common substrate — a metal or a metal oxide surface. SAMs exist in a number of different types homogeneous SAMs on planar and curved substrates, SAMs on metallic liquids, SAMs on nanoparticles, mixed SAMs, and two-dimensionally patterned SAMs. Table 1 compares some characteristics of SAMs and conventional polymers based on bonding and structural type. 

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