II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-31
TRANSPARENT CARBON COATINGS OF ULTRA FINE DIAMOND
Patrusheva T.N.
Krasnoyarsk State Technical University, Krasnoyarsk, Russia
e-mail: pat@ire.krgtu.ru
Carbon coatings were widely used in different fields of technology. Diamond-like
coatings are most attractive as they are transparent, inert and stable in aggressive medium.
They are usually obtained by CVD method using different organic gas diluted with hydrogen
as precursor material. Unlike the CDV techniques which require sophisticated equipment, solgel
method of deposition of the films may offer an easy and cost effective technology route
which may allow one to obtain good quality thin films.
Low-temperature method for depositing Ultra Fine diamond (UFD) films by a simple wet
chemical route is presented. UFD is produced from detonation synthesis of explosive
substances. It was prepared in an explosion chamber in inert gas atmosphere and explosive
substance (3-nitrotoluen, trotil) was kept inside the chamber. After explosion the powder
obtained contained about 8 to 20 % of UFD. This powder is undergoes purification by etching
of graphite carbon. Finally powder consists of diamond particles with dimensions of
4 – 20 nm and their aggregates.
Suspension of UFD in organic solvents could be obtained by using physical extraction
method using organic liquids. Nanoparticles have tendency to diffuse in organic phase from
aqua phase. In this process, purification of UFD also takes place because the metal impurities
are not extracted into the organic phase while the ultrafine particles of UFD are crossed in
organic phase. The calculations based on optical investigation showed that the dimensions of
UFD-particles in organic suspensions are in the region of 2-6 nm.
The transparent UFD suspensions in aliphatic and alicyclic carbohydrates were made.
The loading of UFD-suspensions varied between 0,03-0,05 g/dm 3 in hexane, octane, toluene.
The removal of solvent from suspension allowed reaching their concentration 0.6-1.0 g/dm 3 .
At the further evaporating the suspensions was loosed the transparency with the initiation of
precipitation. The specific conditions for stable suspension obtaining were developed.
Different kinds of additions were tested.
Formation of carbon suspensions of the Ultra Fine Diamond (UFD) in organic liquids is a
promising area for obtaining useful carbon coating on different substrates. The organic
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