Nanocomposites and nanomaterials
Nanocomposites of polymer with carbon nanotubes on silicon structures

O.Lytvynenko1, L.Karachevtseva1, M.Kartel2, O.Bakalinskaya2, Y.Sementsov2
1Department of Photonic Semiconductor Structures, V. Lashkaryov Institute of Semiconductor Physics, NASU, Prsp. Nauki, 41, Kiev-03028, Ukraine.
E-mail: lytvole@gmail.com
2Department of Nanoporous and Nanosized Carbon Materials, O. Chuiko Institute of Surface Chemistry, NASU, 17 General Naymov Street, Kyiv 03164 Ukraine.

Carbon nanotubes are among the most anisotropic materials known and have extremely high values of Young's modulus. The possibilities to enhance the properties of nanostructured surfaces were investigated on “polymer-carbon nanotube” composites. Carbon high purity multiwall nanotubes (CNT) of 2 µm length and 20 nm diameter were obtained by catalytic pyrolysis of unsaturated hydrocarbons and cooled in vacuum. The IR absorption peak dependencies on CNT content in polymer are described by a 1D Gaussian curve for the diffusion equation in the electric field. The electric field intensity between nanotubes and polymer matrix is equal to 6.3103 V/cm at 0.25% CNT. It was established that the effective way to enhance the strength properties of “polymer-multiwall carbon nanotube” composites is the composite crystallization and sp3 C‑C tetrahedrons organization between nanotubes supported by resonance vibrations in the intrinsic electric field 6103 V/cm between nanotube and polymer matrix.
Colloidal solution carbon multiwall nanotubes with polyethylenimine were deposited on silicon structures. The effects of blooming, surface bond passivation and photoluminescence increase were evaluated on macroporous silicon structures with nanocoating CNT-polyethylenimine. Nanocoatings reduce IR absorption of macroporous silicon (the blooming effect) due to surface bond passivation by nanocoating [1]. The photoluminescence intensity of nanocoating CNT- polyethylenimine on substrate of macroporous silicon with microporous layer is 5.6 times higher than that of the single crystalline silicon substrate. It is due to decrease of the proton non-radiative recombination on the boundary CNT-polyethylenimine and microporous layer with positive charge of hydrogen atoms. It’s important for development of "white" light sources, radiation converters and lasers for silicon micro- and nanophotonics.

1.	Karachevtseva L.A., Kartel M.T., Lytvynenko O.O., Onyshchenko V.F., Parshyn K.A., Stronska O.J. Polymer-nanoparticle coatings on macroporous silicon matrix // Advanced Materials Letters –2017.–8, №4.– P. 336-341.