Nanotechnologies, Nanomaterials and Metamaterials

Electrically conductive properties of graphene–nanotube hybrid/aluminium oxide interfaces

M. M. Slepchenkov^a, D. T. Murashko^b, A. V. Kuksin^b, R. M. Ryazanov^c, E. A. Lebedev^b, Yu. P. Shaman^cd, E. P. Kitsyuk^c, A. Yu. Gerasimenko^be, O. E. Glukhova<sup>ae

a</sup> Saratov State University
^b National Research University «Moscow Institute of Electronic Technology»
^c Scientific-Manufacturing Complex “Technological Centre”
^d Institute of Nanotechnology of Microelectronics of Russian Academy of Sciences
^e I. M. Sechenov First Moscow State Medical University

Abstract: Background and Objectives: Currently, carbon nanostructure/metal oxide interfaces are becoming one of the key components of nanoelectronic devices, including tunnel field-effect transistors. Among carbon nanomaterials, special attention is paid to graphene, the increase in structural stability and control of electrical conductivity of which is an urgent scientific task. One of the solutions to this problem, which has been experimentallytested, is a combination of graphene with carbon nanotubes(CNT) in a hybrid nanostructure. Inthis work, we experimentally obtained for the first time 2D/0D interface samples in the form of a hybrid film of reduced graphene oxide (RGO) and single-walled carbon nanotubes (SWCNTs) with deposited aluminum oxide (Al$_2$O$_3$) nanoparticles. Materials and Methods: Samples with an Al$_2$O$_3$ nanoparticle layer thickness of 5 nm and 20 nm were synthesized. Due to pulsed laser radiation with an energy density of 0.24 J/cm$^2$ (laser processing power of 70 mW), the effect of binding Al$_2$O$_3$ nanoparticles to the surface of RGO/SWCNT nanostructures, as well as the effect of forming SWCNT nanostructures oriented at an angle to the silicon substrate, was achieved. Results: Electrical conductivity measurements were performed for the synthesized samples at temperatures of –50, –10, +20, +60, +140, +200$^\circ$C. It has been found that with increasing temperature, the electrical conductivity of the sample with a layer thickness of Al2O3 nanoparticles of 5 nm increases by 2.5 times, and the sample with a thickness of 20 nm – by 4.2 times. At the same time, for the sample with a layer thickness of Al$_2$O$_3$ nanoparticles of 20 nm, higher electrical conductivity values are characteristic at all temperatures. Conclusion: Based on the obtained results, the synthesized samples of the RGO/SWCNT/Al$_2$O$_3$ interface can be recommended for use in nanoelectronic devices.

Keywords: graphene–nanotube hybrid films, aluminum oxide, electrical conductivity, laser action.

UDC: 538.9

Received: 11.04.2025
Revised: 29.08.2025
Accepted: 15.05.2025

DOI: 10.18500/1817-3020-2025-25-3-356-368