Photoelectrochemical biosensor for lead ion determination based on complementary strand aptamers

Abstract

Lead ion causes heavy metal pollution, which can cause serious damage to the ecological environment and human health. In this paper, a simple and sensitive photoelectrochemical method was designed for lead ion detection by using ZnO nanorods as the photoactive substrate and complementary strand aptamers as target recognition element. ZnO nanorods with favorable stability and photoelectric activity can provide a biocompatible microenvironment for aptamer loading. In the presence of lead ion, it would combine with the recog-