Carbon heterostructures based on carbon nanotubes and graphite formed by laser radiation

Abstract

A method for laser formation of electrically conductive carbon heterostructures in a polydimethylsiloxane matrix has been developed. The heterostructures were networks of covalently linked multiwalled carbon nanotubes (MWCNT) and graphite particles. Samples with different weight concentrations of carbon nanomaterials were formed. It was found that a composite based on an MWCNT/graphite composition with concentrations of 3/5 wt.%, respectively, had the lowest resistance. Pulsed laser treatment (1064 nm, 100 ns, 30 kHz) made it possible to form carbon heterostructures in a polymer matrix with a given geometry. This led to a 5-fold decrease in resistance to 200 Ohm. The structural, electrical, and mechanical properties of the composites were studied. The structure of the samples was investigated using Raman spectroscopy. The obtained changes in the ID/IG ratio as a result of laser treatment confirm local rearrangements of the electronic structure of MWCNT with the formation of new bonds. Mechanical properties studies showed that a composite based on PDMS/MWCNT/graphite heterostructures after laser processing withstood a load of 7.9 N and stretched to 9.4 mm before breaking. The resulting composites formed the basis for strain-sensitive sensors and dry electrode interfaces for recording motor activity and biopotentials in the human body. The results confirm that the developed carbon heterostructures are suitable for continuous monitoring of physiological parameters of the human body as part of smart wearable devices.
The study was supported by the Russian Science Foundation (RSF No. 25-29-00938 dated 12/26/2024).

Speaker

Artem V. Kuksin
National Research University of Electronic Technology MIET
Russia

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