Abstracts Book - IMRC 2018

• SA1-O011
NETWORK OF GRAPHENE AUGMENTED CERAMIC NANOFIBERS
Irina Hussainova 1 , Roman Ivanov 1
1 Tallinna Tehnikaülikool, Mechanical and Industrial Engineering, Estonia.
The present paper focuses on development and functionalization of the
nanonet of nanoscaled self-aligned alumina fibers with 10 nm in diameter and
a huge aspect ratio of 10 7 . The network of nanofibers was produced by
controlled liquid phase oxidation under the specific conditions. Targeted
functionalities are achieved by appropriate functionalization and/or attachment
of nanoscale objects. In the present study, a wide variety of carbon
nanostructures was grown on a surface of alumina nanofibers with the help of
a single step catalyst-free chemical vapor deposition method by variation of the
process parameters. It is the first time that (i) the chemically and mechanically
stable 3D network of the highly aligned ceramic nanofibers has been produced
by the simple and cost-effective method; (ii) the distinct morphologies and
dimensionalities of carbon nanostructures (i.e. graphene “wraps” around the
fiber, highly foliated graphene sheets; graphite coating, etc.) have been
synthesized in the hot-wall CVD reactor with no catalyst or additional operations.
The experimental design included temperature, gas ratio and flowing rate, and
deposition time. The procedure facilitates modeling and tailoring different
graphenated structures in dependence on specified requirements. The
produced structures were examined by HR-SEM, Raman spectroscopy and HR-
TEM to identify the morphological features and microstructural peculiarities.
Based on the results of this study, the mechanism of possible graphene layers
formation around a dielectric fiber is proposed. The nanonet allows consistent
and integrated production of multi-materials cross-level (from nano to macro)
structures by utilizing functional properties advancement via engineered
structural and compositional features.
Acknowledgment: This work was supported by research grant PUT1093 (to I.
Hussainova) of the Estonian Research Council as well as Baltic-American
Freedom Foundation under research grant to I. Hussainova.
Keywords: graphene, nanofibers, nanostructure
Presenting authors email: irina.hussainova@ttu.ee