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⁺.

Keywords:

• Surface plasmon resonance
• Calix[4]arene
• Metali on

ACKNOWLEDGMENT

This work was financially supported by National Natural Science Foundation of China (No.29825112), the Chinese Academy of Sciences (No. KJ 951-AI-507) and the Center of Molecular Science Innovation Project Foundation. We are also grateful to Dr. X. H. Huang for beneficial discussions.