Two-dimensional FeS nanoflakes: synthesis and application to electrochemical sensor for mercury(II) ions

Abstract

We report a facile solvothermal method to prepare troilite FeS two-dimensional nanoflakes. The morphology and size were observed by transmission electron microscopy (TEM), the intrinsic crystallography of the obtained FeS nanoflakes was characterized by powder X-ray diffraction and high-resolution TEM, and the composition was analyzed by X-ray photoelectron spectroscopy. Furthermore, the prepared FeS nanoflakes were successfully modified on an electrode to fabricate a sensor for Hg 2? detection. The electrochemical detection mechanism was expected that Hg 2? ions interact with FeS to form stable HgS in the nanoflakes, which provided a sensitive approach for electrochemical detection of Hg 2? selectively. The detection limit for Hg 2? was 4 nM in a PBS solution. The prepared sensor based on the FeS nanoflakes shows the better performance than that with bulk-FeS materials for the Hg 2? detection. The proposed FeS nanoflakes also exhibit good applicability for monitoring Hg 2? in real water specimens.

Ferromagnetic Elements in Two‐Dimensional Materials: 2D Magnets and Beyond

“…Reproduced with permission. [ 128 ] Copyright 2015, Springer; (bottom‐right) demonstration of fabrication procedure and selectivity test of a potentiometric wearable sensor based on 2D Ni‐BDC for Ni 2+ detection. Reproduced with permission.…”

“…The proposed detection mechanism of FeS nanoflakes relies on the ability of Hg 2+ to form stable HgS, which is measured through cyclic voltammetry as it converts into Hg 2 S. The sensor was applied for tap and river water analysis. [ 128 ] Furthermore, a 2D Ni‐BDC (MOF) nanosheet was utilized in a wearable sensor for the potentiometric detection of Ni 2+ ions (Figure 8). The 2D Ni‐MOF operated as the electroactive material in highly porous carbon cloth doped with nitrogen and decorated with spherical porous carbon nanoparticles as a self‐standing substrate.…”

“…Copyright 2023, Elsevier; (bottom-left) schematic illustration of the sensing strategy of 2D FeS nanoflakes for the detection of Hg 2+ ion. Reproduced with permission [128]. Copyright 2015, Springer; (bottom-right) demonstration of fabrication procedure and selectivity test of a potentiometric wearable sensor based on 2D Ni-BDC for Ni 2+ detection.…”

The Controllable Synthesis of High‐Quality Two‐Dimensional Iron Sulfide with Specific Phases

“…For FeX (X = Se, Te), the tetragonal phase should be more accessible to synthesis in a low Se/Te ratio environment. [ 18,32 ] We found that when the Fe/S ratio reaches 4:1, the optical images of products present a shift from hexagon to square. The proportion of t‐FeS gradually increases, and the proportion of h‐FeS decreases as the S temperature decreases.…”