Three Dimensional Monolayer of 3‐Mercaptopropionic Acid Assembled on Gold Nanoparticles for Electrochemical Determination of Trace Cu(II)

Abstract

The electrochemical behavior of Cu(II) was investigated on three‐dimensional 3‐mercaptopropionic acid (MPA) assembled on gold nanoparticle‐modified glassy carbon (GNP/GC) electrode. The results demonstrated that the MPA monolayer inhibited the charging current while promoted the response of accumulated Cu(II) on GNP/GC electrode. The effects of pH, scan rate, and accumulation time on the voltammetric behavior of Cu(II) on the MPA/GNP/GC electrode were studied. The MPA modified electrode presented a voltammetric response linearly proportional to the Cu(II) concentration from 0.1 µg/l to 100 µg/l, with a detection limit of 3.2 ng/l. Moreover, this electrode was successfully applied to the determination of Cu(II) in tap water.

Keywords:

• 3‐Mercaptopropionic acid
• gold nanoparticles
• self‐assembled monolayer
• determination of Cu(II)

Notes

This work was supported by Science Research Foundation of Huazhong University of Science and Technology (2006Z002A).