Study and characterization of diamond surface for biosensoring applications

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Chapter 1 Diamond:“the Biggest and the Best” 1.1 General properties Diamond has been prized for centuries as a gemstone of exceptional bril- liance and lustre. But to a scientist diamond is interesting for its range of exceptional and extreme properties. Indeed, a glimpse at any compendium of material data properties will prove that diamond is almost always ‘the biggest and best’ [24]. Among other properties, diamond is the hardest known material, has the highest thermal conductivity at room temperature, is transparent over a very wide wavelength range, is the stiffest material, the least compressible, and is inert to most chemical reagents. A selection of some of these properties is given in tab.1.1. With such a wide range of exceptional properties, it is not surprising that diamond has sometimes been referred to as ‘the ultimate engineering material’. But what is diamond exactly? Diamond is composed of the single element carbon, and it is the arrange- mentoftheCatomsinthelatticethatgivesdiamonditsamazingproperties. Let us compare the structure of diamond and graphite, the other major al- lotrope of carbon, both composed of just carbon. In diamond we have the hardest known material, in graphite we have one of the softest, simply by re- arranging the way the atoms are bonded together. The relationship between diamond and graphite is a thermodynamic and kinetic one, as can be seen in the phase diagram for carbon (fig.1.1). At normal temperatures and pressures, graphite is only a few eV more stable thandiamond, andthefactthatdiamondexistsatallisduetotheverylarge 7

Anteprima della Tesi di Micaela Castellino

Anteprima della tesi: Study and characterization of diamond surface for biosensoring applications, Pagina 4

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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