Fig. 7From: Nanosheet composed of gold nanoparticle/graphene/epoxy resin based on ultrasonic fabrication for flexible dopamine biosensor using surface-enhanced Raman spectroscopyRaman spectra of 2 mM of 4-MBA with neat EPR (a), GNS/EPR5 (b), and Au NPs/GNS/EPR5 (c)Back to article page