Resonance light scattering sensor of the metal complex nanoparticles using diethyl dithiocarbamate doped graphene quantum dots for highly Pb(II)-sensitive detection in water sample.

This study was aimed to detect Pb using diethyl dithiocarbamate-doped graphene quantum dots (DDTC-GQDs) based pyrolysis of citric acid. The excitation maximum wavelength (λ ex = 337 nm) of the DDTC-GQDs solution was blue shift from bare GQDs (λ ex = 365 nm), with the same emission maximum wavelength (λ em = 459 nm) indicating differences in the desired N, S matrices decorating in the nanoparticles. Their resonance light scattering intensities were peaked at the same λ, ex/em = 551/553 nm without any background effect of both ionic strength and masking agent.