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Phase-Engineered Graphene/1T-Tungsten Disulfide Heterostructure for Sustainable Trace-Level Mercury Monitoring in Water Systems
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DOI：10.1002/adsu.70567.png)
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Abstract
En 中文
Here, we present a two-terminal van der Waals (vdW) heterostructure-based ultra-sensitive sensor for the real-time detection of mercury (Hg2+) ions. The sensing receptor is a heterostructure of semi-metallic graphene and metallic 1T-tungsten disulfide (1T-WS2) (i.e., graphene/1T-WS2), and it shows a highly conductive interface with strong interfacial charge-transfer properties. The device also shows an ultrawide detection range from 100 ppt (parts-per-trillion) to 100 ppm (parts-per-million) with extraordinary sensitivity of ∼154.95 µA ppb−1 at a reasonably low operating voltage of only 10 mV. The sensor has a high selectivity toward Hg2+ ions over other heavy metal ions, such as Sodium ion (Na+), Calcium ion (Ca2+), Cobalt(II) ion (Co2+), Chromium (III) ion (Cr3+), Nickel(II) ion (Ni2+), Cadmium(II) ion (Cd2+), Manganese(II) ion (Mn2+), Copper(II) ion (Cu2+), and Lead(II) ion (Pb2+). The electrical characterization shows a systematic decrease in the sensor's current with increasing Hg2+ ions concentration, ascribed to strong analyte-induced charge depletion at the graphene/1T-WS2 interface. A remarkably low detection limit of ∼58.8 ppt, which is well below the permissible limits, emphasizes its usefulness in the detection of Hg2+ ions. The results demonstrate the vdW heterostructure engineering strategy as an effective platform in the development of ultrasensitive, highly selective, and energy-efficient heavy metal ion detectors.
Keywords:
(Graphene/1T-tungsten disulfide (1T-WS2)
heterostructure
Hg2+ ion detection
van der Waals (vdW)
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