Rattle-type Au@NiCo LDH hollow core-shell nanostructures for nonenzymatic glucose sensing

Herein, a facile procedure is developed to fabricate the rattle-type Au@NiCo layered double hydroxide (LDH) hollow core-shell nanostructures exhibiting remarkably high sensitivity and selectivity for nonenzymatic glucose sensor. The metal-organic frameworks (ZIF-67) is firstly obtained as precursor and template. The ZIF-67 is then etched into a hollow polyhedron and transformed into NiCo LDH nanosheets via the Kirkendall effect under the role of Ni salt during the hydrothermal process. Simultaneously, the Au nanoparticles (NPs) is formed in the cavity to obtain the Au@NiCo LDH with Au NPs as core and NiCo LDH nanosheets as shell. The superior electrocatalytic performance of Au@NiCo LDH towards glucose oxidization indicates that the Au@NiCo LDH modified electrode exhibits high sensitivity of 864.7 mu A mM(1 )cm(-2) in a linear range of 0.005-12 mM, low detection limit of 0.028 mu M (S/N = 3) and excellent anti-interference performance, demonstrating the rattle-type Au@NiCo LDH hollow core-shell nanostructures would be one promising electrode material for nonenzymatic glucose sensor. (C) 2020 Elsevier B.V. All rights reserved.