Optimal hydrothermal synthesis, characterization, and sensor application of sulfur-doped γ-MnOOH microrods

Abstract

Sulfur-doped γ-MnOOH rods were successfully prepared by employing a one-step hydrothermal process based on thioacetamide (TAA), and their structure was directly confirmed and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The mechanism for the TAA assisted hydrothermal synthesis of γ-MnOOH rods has been preliminarily presented. Furthermore, the synthesized sulfur-doped γ-MnOOH rods were immobilized onto a glassy carbon electrode and applied to construct an electrochemical hydrazine sensor, which exhibited a wide linear range (0.1 μM–1.15 mM and 1.15–45.75 mM), low detection limit (0.079 μM), high selectivity, and long-term stability.