Study of mechanical characteristics of layered structures based on carbon nanomaterials for creation of bioelectronic components

The paper presents the technology of formation of layered structures based on carbon nanomaterials intended for the creation of bioelectronic components. The structures were formed by spray deposition and ordering of layers of single-walled carbon nanotubes and reduced graphene oxide. Vertically ordered complex tree-like structures of single-walled carbon nanotubes and reduced graphene oxide were formed using laser radiation of nanosecond ytterbium fiber laser with a wavelength of 1064 nm and energy density of 0.12 J/cm$^2$. It is shown that the hardness values of the samples of SWCNTs, vOH and hybrid composition of SWCNTs and vOH increased in the range of 1.5–2 times and amounted to 38.56 $\pm$ 4.91 GPa, 34.34 $\pm$ 1.56 GPa and 37.05 $\pm$ 8.30 GPa, respectively. Also, when exposed to laser radiation with energy density of 0.12 J/cm$^2$, the values of elastic modulus of CNT, vOH and hybrid composition of CNT and vOH samples increased by 1.2–1.5 times and amounted to 233.12 $\pm$ 18.70 GPa, 235.89 $\pm$ 3.85 GPa and 281.69 $\pm$ 3.74 GPa, respectively.Also, when exposed to laser radiation with energy density of 0.12 J/cm$^2$, the values of elastic modulus of the samples of SWNTs, vOH and hybrid composition of SWNTs and vOH increased by 1.2–1.5 times and amounted to 233.12 $\pm$ 18.70 GPa, 235.89 $\pm$ 3.85 GPa and 281.69 $\pm$ 3.74 GPa, respectively. The adhesion of samples of CNT-based layered structures and the hybrid composition of CNTs and vOHs was determined. By scratch evaluation, it was obtained that the samples ordered by laser irradiation of 0.12 J/cm$^2$ are able to withstand loads up to 40 mN. The formed ordered layered structures based on carbon nanomaterials are promising for application as bioelectronic components, for example, neurointerfaces for diagnostics or therapy, implanted in the body.