Thiodisuccinic Acid Functionalized Silver Nanoparticles Used as a Colorimetric Sensor for Lead Ion

Li Wei,Liu Runqiang,Cui Chengxing,Qu Lingbo,Zhang Yuping,Chen Wentao

doi:10.1109/icmtma.2011.824

Abstract

We reported herein the preparation of thiodisuccinic acid-capped silver nanoparticles (TDSA-AgNPs) in water solution and their visual detection for lead ions. The freshly synthesized TDSA-AgNPs were yellow in color due to the intense surface plasmon absorption band. In the presence of Pb 2+ , the yellow TDSA-AgNPs solution turned to a deep orange color accompanying with the peak broadening. However, the sensitivity of TDSA-AgNPs towards other representative metal ions (Cu 2+ , Mn 2+ , Mg 2+ , Fe 3+ , Zn 2+ , Ni 2+ , Ca 2+ , Sr 2+ ) could be negligible. Furthermore, the effect of the concentration of Pb 2+ to the modified AgNPs was investigated and the limit of detection for Pb 2+ was 8×10 -5 mol/L by the naked eye. Meanwhile, the possible mechanism of the aggregated TDSA-AgNPs was discussed by the simultaneous addition of ethylenediaminetetraacetate (EDTA) and Pb 2+ in the TDSA-AgNPs colloids.

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