## 4 Conclusions  
A laser technology for creating nanocomposites from alternating layers of albumin and collagen with SWCNT was developed. For this purpose, a setup with a diode laser (810 nm) and temperature feedback system was used. This was necessary to control the temperature of the area affected by the radiation. Nanocomposites of two types SWCNT1 and SWCNT2 with different morphologies and concentrations of 0.001 and 0.01 wt.% were created. SWCNT1 had small dimensions (diameter and length) and were represented mainly in the form of isolated nanotubes. The diameter and length of SWCNT2 were larger, while they were mainly presented in the form of bundles. Nanocomposites were created by applying alternating layers of aqueous dispersions with albumin/collagen proteins and nanotubes, followed by laser irradiation using the developed device with temperature control. Using Raman spectroscopy, it was determined that the initially more defective SWCNT2 inside the nanocomposite showed the least defectiveness. The decrease in defectiveness is explained by the formation of branched 3D networks from nanotubes with covalent bonds between carbon atoms in the defective regions. An increase in the concentration of SWCNT2 to 0.01 wt.% provided a decrease in defectiveness from \(\mathrm{I_{D}}\)/\(\mathrm{I_{G}}\)\(\sim\)0.076 to \(\mathrm{I_{D}}\)/\(\mathrm{I_{G}}\)\(\sim\)0.035. It was revealed that during the manufacture of nanocomposites, SWCNT absorbed laser radiation, thereby creating thermal heating of proteins. As the temperature rised, the number of damage to the weak bonds of the tertiary proteins structure increased, which allows the molecule to change its conformation. This process promoted the adhesion of proteins to branched 3D networks of SWCNT in the nanocomposite. The results of Raman spectroscopy were confirmed by the values of the electrical conductivity. The electrical conductivity of nanocomposites based on large SWCNT2 nanotubes at concentrations of 0.001 and 0.01 wt.% was 3.2 and 4.3 S/m compared to the specific electrical conductivity for nanocomposites based on SWCNT1 with the same concentrations--1.1 and 1.8 S/m. The created nanocomposites of both types of SWCNT with both concentrations are suitable for the creation of electrically conductive interfaces of stimulating devices or tissue-engineered structures for myocardial restoration (myocardial conductivity 0.03-0.6 S/m). High porosity values were obtained for all types of nanocomposites. Higher concentration of nanotubes provided an increase in the porosity of nanocomposites. For nanocompositesbased on SWCNT1, the porosity was 44-61% compared to 68-77% for SWCNT2. At the same time, the morphology of isolated SWCNT1 provided a large proportion of open pores. A significant number of mesopores were found in nanocomposites, especially for samples based on SWCNT1. For this type of nanocomposites, the largest specific surface area and specific volume of mesopores with sizes up to 50 nm were obtained. The presence of nanopores in materials can provide adsorption of nanoscale drugs molecules and biomolecules. Nanocomposites ensured the viability of heart fibroblasts in their structure. The best biocompatibility was observed for SWCNT1-based nanocomposites with a low concentration (0.001 wt.%). Thus, nanocomposites based on SWCNT1 with low concentration (0.001 wt%) can be used for implantable devices or materials. At the same time, nanocomposites based on SWCNT2 with a concentration of 0.01 wt.% will be the optimal choice for skin devices with high electrical conductivity. Conceptualization, A.Y.G. ; Formal analysis, O.E.G. ; Investigation, A.Y.G., U.E.K., I.A.S., M.V.M. and O.E.G. ; Methodology, A.Y.G., I.A.S., M.V.M., A.V.Z., M.I.S. ; Supervision, A.Y.G. ; Validation, A.Y.G., A.V.Z. and M.I.S. ; Visualization, A.Y.G., U.E.K. ; Writing --original draft, A.Y.G., U.E.K. ; Writing --review & editing, A.Y.G., A.V.Z. and M.I.S. All authors have read and agreed to the published version of the manuscript.