Because of the bioconcentration and toxicity, Hg2+is extremely hazardous for both human health and environment. However, the conventional detection methods for Hg2+need complex sample preparation, expensive instruments, and long time for the analysis and so on, they can not meet the needs of the actual analysis. In recent years, gold and silver nano-materials have attracted the attention of many researchers in the application of colorimetric detection for Hg2+because of their unique surface plasmon resonanc...