A mechanism of field electron emission from nanoclustered carbon materialsстатья
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Дата последнего поиска статьи во внешних источниках: 18 декабря 2013 г.
Аннотация:The chemical vapor deposition (CVD) method was used to grow carbon films with different crystalline structures that vary from polycrystalline diamond to nanoclustered graphite. A comparative study of their phase composition, structure, and field electron emission (FEE) properties has shown that the best emissivity takes place for nanoclustered graphite films and is characterized by a threshold electric field of less than 1.5 V/mu m, an emission current density of up to 10 mA/cm(2), and an emission site density of more than 10(6) cm(-2). These graphite nanoclustered films showed cathodoluminescence (CL) bands at photon energies of 2.6 and 3.6 eV. The features of CL and the enhanced FEE are explained by the modification of electron configuration of carbon atoms at the edge of graphite planes in the nanoclusters oriented preferably along the substrate surface normal.