In situ laser-induced fabrication of a ruthenium-based microelectrode for non-enzymatic dopamine sensing

Abstract

In this paper, we propose a fast and simple approach for the fabrication of the electrocatalytically active ruthenium-containing microstructures using a laser-induced metal deposition technique. The results of scanning electron microscopy and electrical impedance spectroscopy (EIS) demonstrate that the fabricated ruthenium-based microelectrode had a highly developed surface composed of 10 µm pores and 10 nm zigzag cracks. The fabricated material exhibited excellent electrochemical properties toward non-enzymatic dopamine sensing, including high sensitivity (858.5 and 509.1 µA mM−1 cm−2), a low detection limit (0.13 and 0.15 µM), as well as good selectivity and stability.