Surface graphitization of diamond nanotips induced by field-emission currentстатья
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Дата последнего поиска статьи во внешних источниках: 27 апреля 2022 г.
Аннотация:Surface graphitization as a result of Joule heating by a field-emission (FE) current is revealed for needlelike diamond nanotips. The apex temperatureand electrical resistance of the diamond needles during FE were measured by electron spectroscopy. Transmission electron microscopyindicated that the diamond structure in the near-surface layer was transformed into well-ordered graphene layers after FE with currentsof up to 30 lA. The resulting structure can be viewed as a multi-walled carbon nanotube (MWCNT) having a diamond core. Thus, theobserved FE behavior exhibited by the graphitized diamond needles is qualitatively similar to that of MWCNTs. On the other hand, due toits outstanding thermal conductivity, the diamond core ensures an efficient Joule heat dissipation, which provides better emission stabilityand higher currents, up to at least 225 lA. It makes these graphitized diamond needles promising candidates for high-brightness point electronsources required for various applications, e.g., in electron microscopy or scanning electron lithography.