New synthesis of gold nanocorals using a diazonium compound, and their application to an electrochemiluminescent assay of hydrogen peroxide

摘要

The reaction of hydrogen tetracholoroaurate, sodium borohydride and the diazonium compound prepared from 4-aminobenzoic acid results in the formation of gold nanocorals (Au-NCs) for the first time. Scanning electron microscopy images and transmission electron microscopy images show that the Au-NCs are composed of nanowires with a diameter of 5.3 nm. A glassy carbon electrode modified with Au-NGs is found to trigger intense electrochemiluminescence of the luminol/H2O2 system at a potential of -0.13 V. The effect was exploited to determine H2O2 in the 0.1 to 100 μM concentration range with a 30 nM detection limit.