Graphdiyne: A Chelating Carbon for High Selectivity Direct Electrochemical Sensing of Trace Copper Ions

Graphdiyne is firstly explored for high selectivity direct electrochemical sensing of Cu2+, achieving a wide detection range of 0.25–380 μM and a trace level as low as 8 nM. This high performance is attributed to the unique C≡C structure of GDY, which possesses both chelating and reducing abilities to anchor and reduce Cu2+ to Cu+.