| Summary: | The use of surface plasmon resonance (SPR) sensors offers a promising quantitative technique for Pb(II) detection in solutions. This study investigated the SPR response of chitosan/graphene oxide (CS-GO) nanostructured thin films in the presence of Pb(II). Gold (Au) or silver (Ag) films incorporating a CS-GO layer were fabricated and characterized by X-ray diffraction (XRD) analysis. The detection limit of Pb(II) solutions was determined using the SPR sensor on samples from the Saigon River, Vietnam. The XRD analysis revealed little difference in the crystallinity for Au/CS-GO and Ag/CS-GO films. The SPR sensitivity towards the Pb(II) ion solution was 1.332° ppm−1 for Ag/ CS-GO, which was slightly higher than that for the Au/CS-GO, which was 1.222° ppm−1. Compared to the Ag/CS-GO film, the Au/CS-GO film was reusable up to three times for all concentrations of Pb(II). Upon exposure to water samples from the Saigon River, both of the films successfully detected Pb(II) even with the interference of other metals. The CS-GO fabricated on the thin films favours the binding potential with the Pb(II) ions. Thus, the proposed Au/CS-GO film may be an economic solution due to higher reusability and higher sensitivity for the detection of Pb(II) in the polluted water. © 2017 Desalination Publications. All rights reserved.
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