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+.
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Wang et al. (2001) studied this question.
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