Design of Ni(OH) nanocages@MnO nanosheets core-shell architecture to jointly facilitate electrocatalytic dynamic for highly sensitive detection of dopamine.

In this work, Ni(OH) nanocages@MnO nanosheets core-shell architecture (Ni(OH) NCs@MnO NSs CSA) was successfully prepared through coordinated etching and precipitation (CEP) route followed by hydrothermal reaction, and then tested as sensitive electrode material for detection of dopamine (DA). The three dimensional (3D) hollow Ni(OH) core effectively prevented the aggregation of MnO NSs, leading to high utilization rate of MnO NSs. Meanwhile, the two dimensional (2D) MnO shell endowed Ni(OH) NCs with larger specific area and abundant diffusion channels, facilitating mass transport. Ni(OH) NCs@MnO NSs CSA modified glassy carbon electrode (GCE) exhibited two satisfying sensitivities of 467.1 and 1249.9 μA mM cm within the two linear ranges of 0.02-16.30 μM and 18.30-118.58 μM, respectively. Furthermore, Ni(OH) NCs@MnO NSs CSA/GCE presented low detection limit of 1.75 nM and short response time of 1.14 s. Overall, Ni(OH) NCs@MnO NSs/GCE looks promising for analytical sensing of DA thanks to its prominent electrocatalytic dynamic issued from the 3D hollow structure@2D nanosheets core-shell architecture.