Non-Volatile Resistive Switching of Coagulated Blood Film Based Biomemristor Under Electric Field and UV Radiation

The use of human body fluids for disease monitoring and development of new diagnostic methods is an important scientific problem. On the one hand, human blood carries information about the health status of the body. On the other hand, the effect of resistive switching has been observed in various body liquids, including blood. In this study, we investigate the electrophysical properties of resistive switching in human blood under the influence of an electric field, short-wave (253 nm) ultraviolet radiation and visible light. We examined three samples from three different donors of different sex and age. The samples consisted of a thin film of coagulated capillary blood smeared onto Al and SiO2 substrates. We demonstrate that all studied blood samples exhibit classic bipolar resistive switching in a vertical electric field. Some blood samples revealed gradual resistive switching during transition from a low-resistance to a high-resistance state demonstrating a number of intermediate states. The most surprising result was that the blood demonstrated a photomemristive effect under ultraviolet light irradiation. In samples studied in a lateral electric field, where the electrodes were placed on the surface of the blood film, an increase in blood conductivity was observed under the influence of both white light and short-wave ultraviolet light.