Rare earth erbium molybdate nanoflakes decorated functionalized carbon nanofibers: An affordable and potential catalytic platform for the electrooxidation of phenothiazine

Currently, the sonochemical synthesis method has received considerable attention due to its cost-effectiveness, simplicity, and ease of operation compared to other conventional synthesis methods. Significantly, rare earth metal-doped molybdates are promising materials in the fields of photo- and electrochemical detection. Herein, a flake-like structured erbium molybdate (Er2MoO6)/functionalized carbon black (f-CNF) composite was synthesized via a facile sonochemical synthesis method. The resultant materials were characterized through spectrophotometric techniques, and the f-CNF/Er2MoO6-modified screen-printed electrode (SPE) was fabricated for the electrochemical detection of phenothiazine (PTZ). The electrocatalytic oxidation behavior of PTZ on a modified electrode was tested using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Interestingly, the fabricated f-CNF/Er2MoO6-modified SPE was characterized to have a broad dynamic linear range from 0.025 to 80 mu M, a limit of detection (LOD) of 0.008 mu M, and a sensitivity of 3.707 mu A mu M-1 cm(-2) towards the electrochemical oxidation of PTZ. Moreover, the PTZ sensor exhibited good stability, selectivity, and well precision. The practicality of the PTZ sensor was tested in human urine samples. (C) 2020 Elsevier Ltd. All rights reserved.