A nanoelectrode array is a set of regularly arranged isolated metal electrodes with a small radius, which is comparable with the thickness of the electric double layer. Nanoelectrode arrays are much in demand in electroanalytical chemistry, electrocatalysis, and bioelectrochemistry. One of the promising approaches for the preparation of such systems is templated electrodeposition. In our paper [1], porous anodic alumina templates were used to prepare Au nanoelectrode arrays. Multistage electrodeposition is proposed for the formation of recessed electrodes with the ability to tune the distance between the surface of the porous template and the top surface of the nanoelectrodes. A set of complementary techniques, including chronoamperometry, coulometry, and scanning electron microscopy, are used to characterize the nanoelectrode arrays. It was shown that 45 ± 15% of electrodes have electrical contact with the current collector. The pathways to further improve the recessed nanoelectrode arrays based on anodic alumina templates are discussed.
The work was supported by the Russian Science Foundation (Grant No. 19-73-10176).
[1] E.O. Gordeeva, I.V. Roslyakov, A.P. Leontiev, A.A. Klimenko, K.S. Napolskii, Uniform arrays of gold nanoelectrodes with tuneable recess depth // Beilstein Journal of Nanotechnology, 2021, v. 12, pp. 957–964. DOI: 10.3762/bjnano.12.72.