Structural peculiarities of single crystal diamond needles of nanometer thicknessстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 ноября 2016 г.
Аннотация:Diamond is attractive for various applications due to its unique mechanical and optical
properties. In particular, single crystal diamond needles with high aspect ratios and sharp apexes
of nanometer size are demanded for different types of optical sensors including optically sensing
tip probes for scanning microscopy. This paper reports on electron microscopy and Raman
spectroscopy characterization of the diamond needles having geometrically perfect pyramidal
shapes with rectangular atomically flat bases with (001) crystallography orientation, 2–200 nm
sharp apexes, and with lengths from about 10–160 μm. The needles were produced by selective
oxidation of (001) textured polycrystalline diamond films grown by chemical vapor deposition.
Here we study the types and distribution of defects inside and on the surface of the single crystal
diamond needles. We show that sp3 type point defects are incorporated into the volume of the
diamond crystal during growth, while the surface of the lateral facets is enriched by multiple
extended defects. Nitrogen addition to the reaction mixture results in increase of the growth rate
on {001} facets correlated with the rise in the concentration of sp3 type defects.