Study and characterization of diamond surface for biosensoring applications

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1 – Diamond:“the Biggest and the Best” 2. Type Ib These are much rarer than Type Ia diamonds (less than 1% of all Type I). They contain nitrogen atoms that are dispersed through- out the crystal lattice. When N atoms are dispersed, they can absorb light in the blue end of the spectrum, allowing yellowish to fancy yellow stones with stronger color than Type Ia. Type Ib and mixes of Type Ia/Ib can be subjected to high pressure and high temperatures (HPHT) to lose color. • Type II A small number of diamonds are Type II. 1. Type IIa These are rare diamonds with exceptionally pure chemical com- position and contain no nitrogen or boron. They are often very large and usually colorless, though they may be pink, brown or blue-green. They are inert to shortwave ultraviolet radiation and don’t conduct electricity but are efficient conductors of heat. 2. Type IIb These are even rarer than Type IIa diamonds. Boron substitutes for some carbon atoms in Type IIb diamonds. They are elec- trical semiconductors and are extremely sensitive to temperature changes. They phosphoresce to shortwave ultraviolet. Most blue diamonds are Type IIb. Figure 1.2. Diamond structure [26] Figure 1.3. Graphite structure [27] 10

Anteprima della Tesi di Micaela Castellino

Anteprima della tesi: Study and characterization of diamond surface for biosensoring applications, Pagina 7

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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