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The study of the electrical conductivity of layers of biological composite nanomaterials

The specific electrical conductivity of the layers of composite nanomaterials in the composition of biological materials (bovine serum albumin (BSA), microcrystalline cellulose (MC)) and single-wall carbon nanotubes (SWCNT) was investigated. Aqueous dispersions of biological composite nanomaterials contained ∼25 wt.% BSA and ∼0.47 wt.% SWCNT, ∼7 wt.% CMC and ∼0.19 wt.% SWCNT. The dispersion was applied by screen printing on biopolymer substrates. After drying, the formed layers had area ∼10×10 mm2, thickness ∼10 µm. Samples were subjected to laser radiation from ytterbium fiber pulsed laser (a wavelength of 1064 nm, a pulse duration 100 ns). Non-irradiated samples were considered controls. From the dimensions of the layer and from the measured resistance R, the conductivity was determined. The following results were obtained. Samples that were not laser irradiated showed lower conductivity values. The layers of biological composite nanomaterials irradiated with a laser have acceptable values of electrical conductivity, good adhesion to the substrate surfaces and are promising for use in medical practice, for example, to create strain sensors for various parts of the body.