STUDY OF THE ELECTROPHYSICAL PROPERTIES OF MULTISCALE STRUCTURES BASED ON CARBON NANOMATERIALS FOR NEURAL INTERFACES
Denis T. Murashko1, Boris M. Putrya1, Krisitina D. Efremova1,2, Ulyana E. Kurilova1,2, Pavel N. Vasilevsky1, Irina A. Suetina3, Marina V. Mezentseva3 ,Alexander Yu. Gerasimenko1,2
1National Research University of Electronic Technology MIET, Shokin Square 1, 124498 Zelenograd, Moscow, Russia;
2I.M. Sechenov First Moscow State Medical University, Bolshaya Pirogovskaya street 2-4, 119991 Moscow, Russia;
3National Research Center for Epidemiology and Microbiology Named after the Honorary Academician N.F. Gamaleya, Gamaleya Street 18, 123098 Moscow, Russia
Abstract
This paper presents the results of a study of the electrophysical properties of multiscale structures based on carbon nanomaterials intended for use as neural interfaces. The multiscale structures were formed on the surface of AISI 316L surgical steel using laser microstructuring followed by the deposition of single-walled carbon nanotubes (SWCNTs). Surface morphology analysis revealed the formation of an ordered microtopography with arrays of protrusions and depressions. Scanning electron microscopy confirmed the uniform distribution of the SWCNT coating.
The electrical conductivity of all studied samples remained comparable to that of the control sample, indicating that the surface modification did not negatively affect the conductive properties of the material. Electrochemical studies showed that the highest areal capacitance (125.7 μF/cm²) and cyclic voltammetry stability (98.7%) were achieved for the sample treated with 4.0 W laser radiation followed by SWCNT deposition. The formation of the multiscale structure also reduced the impedance modulus in the 20 Hz–1 kHz frequency range, with a 1.6-fold decrease at 1 kHz compared to the control sample. Phase angle and Nyquist plot analyses indicated a predominantly capacitive electrochemical response associated with an increased effective surface area and double-layer capacitance. Cell studies confirmed the biocompatibility of the developed structures. The obtained results demonstrate the potential of the developed multiscale structures as electrode materials for implantable neural interfaces.
The work was carried out as part of a major scientific project with financial support from the Russian Federation represented by the Ministry of Science and Higher Education of the Russian Federation under agreement No. 075-15-2024-555 dated April 25, 2024.
Speaker
Denis T. Murashko
National Research University of Electronic Technology MIET
Russia
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