Study and characterization of diamond surface for biosensoring applications

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1 – Diamond:“the Biggest and the Best” the chain, causing this (111)-(2×1) surface to exhibit semi-metallic behavior (fig.1.7). Hydrogenated surface The mono-hydrogenated, (001)-(2×1):H surface is widely accepted to be the most stable under normal conditions [36] [37] [38]. The addition of hydro- gen removes the π and π ∗ states from the electronic structure, as the sur- face dimers change from being double to single bonded. For the (111) ori- entation, mono-hydrogenation of both the SDB (bulk-terminated) and the reconstructed surfaces was investigated, these becoming, respectively, the (111)-(1×1):H and (111)-(2×1):H surfaces (fig.1.7). Figure 1.7. Atomic geometries for the clean and hydrogenated (001)-(2×1) diamond surfaces [35] Oxygenated surface For the (001)-(1×1):O surface, the two most-plausible configurations are the following: (a) the “ketone” arrangement, in which the O atom is double- bonded to a single surface C atom (C=O), with the axis of this carbonyl groupnormaltothesurfaceand(b)the“ether”,inwhichtheOatombridges two surface C atoms and makes a single bond to each (C-O-C). The last one 16

Anteprima della Tesi di Micaela Castellino

Anteprima della tesi: Study and characterization of diamond surface for biosensoring applications, Pagina 13

Tesi di Dottorato

Dipartimento: Dipartimento di Fisica Sperimentale

Autore: Micaela Castellino Contatta »

Composta da 180 pagine.

 

Questa tesi ha raggiunto 84 click dal 22/06/2011.

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