Visual assay for determination of copper ions based on anti-etching of gold nanorods induced by cuprous ions

Plasmonic nanoparticle etching-based optical sensors: current status and future prospects

“…In another approach, an AuNR etching inhibition strategy has been used to detect copper ions (Cu 2+ ) in river water samples. 67 This strategy is based on the blocking of TMB 2+ -mediated etching of the AuNRs by inhibiting HRP enzyme activity by means of Cu + ions. In the reaction medium, the sodium ascorbate reduces Cu 2+ into Cu + , which eventually reduces the activity of the HRP enzyme.…”