Metallic 1T Phase Tungsten Disulfide Microflowers for Trace Level Detection of Hg²⁺ Ions

Abstract

Electrochemical sensors for mercury ion detection would ideally demonstrate wide linear detection ranges (LDRs), ultratrace sensitivity, and high selectivity. This work presents an electrochemical sensor based on metallic 1T phase tungsten disulfide (WS2) microflowers for the detection of trace levels of Hg2+ ions with wide LDRs, ultratrace sensitivity, and high selectivity. Under optimized conditions, the sensor shows excellent sensitivities for Hg2+ with LDRs of 1 nm–1 µm and 0.1–1 mm. In addition to this, the limit of detection of the sensor toward Hg2+ is 0.0798 nm or 79.8 pm, which is well below the guideline value recommended by the World Health Organization. The sensor exhibits excellent selectivity for Hg2+ against other heavy metal ions including Cu2+, Fe3+, Ni2+, Pb2+, Cr3+, K+, Na+, Ag+, Sn2+, and Cd2+. The thus‐obtained excellent sensitivity and selectivity with wide LDRs can be attributed to the high conductivity, large surface area microflower structured 1T‐WS2, and the complexation of Hg2+ ions with S2−. In addition to good repeatability, reproducibility, and stability, this sensor shows the practical feasibility of Hg2+ detection in tap water suggesting a promising device for real applications.

One-step hydrothermal synthesis of WS2 as efficient electrode material for energy storage application

“…Two peaks located at 348.15 cm -1 and 414.18 cm -1 are attributed to the in-plane (E 1 2g) and out-of-plane (A1g) modes signifies the 2H phase of WS2 [10,11]. In addition, three peaks at the low wavelength number appeared at 128.82 cm -1 , 172.87 cm -1 , and 261.6 cm -1 attribute to the 1T phase formation of WS2 [12]. These three new peaks indicate the presence of zigzag-chain superlattice [13].…”

1T and 2H mixed phase WS2 nanoflakes decorated with quasicrystal nanosheets for NO2 sensors

“…Previous literature suggests that the new peaks around 10.52° and 21.54° are the first and second-order diffraction peaks of the (002) plane of 1T WS 2 . 35,36 The appearance of new peaks at lower 2 θ suggests the formation of a 1T phase with a wider interlayer distance. Fig.…”

Large-area WS2 Deposited on Sapphire and Its In-Plane Raman and PL Spectral Distributions

“…Among the transition metal dichalcogenides (TMDC), WS 2 and MoS 2 stand out as the most representative materials due to their high carrier mobility [3] and unique photoluminescence (PL) properties [4] . Moreover, it overcomes the zero band gap of graphene, making it highly promising for research in various fields such as detection [5] , biosensing [6] , LED display [7] , and so on. Currently, the prevalent methods for synthesizing 2D WS 2 materials include mechanical exfoliation [8] , liquid-phase ultrasonication [9] , and chemical vapor deposition (CVD) [10] techniques.…”