Positively Charged Gold Nanoparticle - Graphene Oxide Nanohybrid Modified Electrode for Electrochemical Detection of 5-hydroxytryptamine

In this study, positively charged gold nanoparticle - graphene oxide (AuNPs-GO) was synthesized and constructed a sensor for the detection of 5-hydroxytryptamine(5-HT). Various technologies were used to characterize the AuNPs-GO nanohybrid and the proposed sensor. The sensor showed a sufficient linear range from 0.5 to 60 μM 5-HT and the limit was 0.05 μM (S/N = 3). Furthermore, the sensor has been successfully utilized to determine 5-HT in real samples.