▎ 摘　　要

NOVELTY - Sensing device (200) comprises many microsensors (220A) configured to detect electrical conductivity, and a graphene layer (240A) coating the microsensors, where the graphene layer prevents biofouling of the microsensors. USE - The device is useful for determining acoustic velocity. ADVANTAGE - The device: is simple, small and cost effective; has longer lifetime; utilizes less power overall than one that would require a pump; and has minimized biofouling and corrosion on surfaces other than electrical conductivity sensors, e.g. ship hulls. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a method (m1) of fabricating the sensing device comprising growing a graphene layer directly on a top surface of each of many electrodes (230A) configured for sensing electrical conductivity, where the graphene layer prevents biofouling and corrosion of the electrodes, and depositing the electrodes, with the graphene grown on the top surface of each electrode, on a top surface of an insulating material, so that a bottom surface of each of the electrodes contacts the top surface of the insulating material; and (2) a method (m2) for fabricating the sensing device comprising growing at least one graphene layer, transferring the graphene layer to a top surface of each of many electrodes configured for sensing electrical conductivity, where the graphene layer prevents biofouling and corrosion of the electrodes, depositing the electrodes on a top surface of an insulator material, so that a bottom surface of each of the electrodes contacts the top surface of the insulator material. DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the sensing device in an aqueous solution. Sensing device (200) Substrate (210) Outer microsensors (220A) Electrode (230A) Graphene layer (240A)