Fig. 1From: Gold nanoparticle-based sensing platform of hydrazine, sulfite, and nitrite for food safety and environmental monitoring a Absorption spectrum of APS-Au NPs in solution. Inset: absorption spectrum of APS-Au NPs film coated on glass slide. b CV curve of the APS-Au NPs electrode recorded in 0.1 M H2SO4, at a scan rate of 50 mVs−1. SEM images of the c APS and d APS-Au NPs filmBack to article page