Fig. 5From: Nanosheet composed of gold nanoparticle/graphene/epoxy resin based on ultrasonic fabrication for flexible dopamine biosensor using surface-enhanced Raman spectroscopyFE-SEM images for GNS/EPR2a x = 100,000, b x = 200,000 and for GNS/EPR5, c x = 50,000, d x = 90,000Back to article page