Nanocomposites and nanomaterials

Vacuum synthesis of high-temperature polymeric axially symmetric nanostructures

Svavil’nyi M.Ye., Panarin V.Ye.

G.V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, blvd. Acad. Vernadsky 36, Kyiv-03142, Ukraine.
E-mail: myksvavil@gmail.com

It follows from the well-known Ferrari-Robertson diagram [1] that, depending on the ratio between the components of the mixture of carbon elements with sp2, sp3 phases and hydrogen, various either carbon or polymer materials can be synthesized from this three-component mixture. Technological conditions for the implementation of possible synthesis options i.e. the specific type of material from this diagram does not follow. Vacuum synthesis of carbon nanotubes (CNTs) in a wide range of technological conditions has shown that in some modes, polymer structures are formed that are very similar to conventional CNTs. A typical view of such polymers is shown in Fig. 1a. With a relatively long exposure of individual sections of such polymers under an electron beam of a microscope (~ 20 sec), they increase their size, as can be seen in Fig. 1b, i.e. they melt under the action of an electron beam, although their synthesis was carried out at a temperature of ~7000C. At these temperatures, and even when the substrate was heated to 8000C, there was no noticeable destruction of the structures.
 Fig.1а        Fig.1в 
The technology of CNT synthesis processes, setup, and experimental conditions are described in detail earlier in [2].

1. Robertson J. Diamond-like amorphous carbon. // Materials Science and Engineering. -2002.-R37.-Р.129-281.
2. Panarin V.Ye., Svavil’nyi M.Ye., Khominich A.I., Shkola A.A. On the analogy of physical and chemical processes of the directed growth of crystals and carbon nanotubes // Applied Nanoscience. -2020. -10.-Р.2885-2895.