DETECTION OF METAL IONS USING A WAVELENGTH INTERROGATION SURFACE PLASMON RESONANCE SENSOR WITH CALIX[4]ARENE DERIVATIVES AS SENSING FILMS

Abstract

A wavelength interrogation surface plasmon resonance (SPR) sensor with gold substrate modified with calix[4]arene derivative as sensing film was used to detect metal ions in aqueous solutions. We found that only Ag+and Cu2+could be selectively detected with the detection limit of 10−7 mol/L and 10−4 mol/L, respectively. XPS data confirmed the presence of Au-S bond between the calixarene derivative and the gold substrate and complexation between the calixarene derivative and Ag+ or Cu2+.