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Rahul Kumar Das1,2, Gaurav Pratap Singh1, Dharmveer Yadav2,3

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Summary

This study introduces a novel 2D nanomaterial for rapid mercury detection. The nitrogen and sulfur co-doped carbon quantum dots on molybdenum disulfide offer a sensitive method for environmental mercury monitoring.

Keywords:
2D materialsMoS2functionalized carbon quantum dotsmercury detectionnanocomposites

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) carbon-based materials significantly impact biosciences, electronics, optics, and environmental monitoring.
  • Mercury is a toxic pollutant causing severe health issues, necessitating effective environmental monitoring.
  • A suitable 2D nanostructural interface is crucial for detecting mercury levels.

Purpose of the Study:

  • To develop a rapid and sensitive method for detecting mercury (II) ions using a novel 2D nanocomposite.
  • To investigate the synergistic effects of nitrogen and sulfur co-doped carbon quantum dots anchored on exfoliated molybdenum disulfide.
  • To assess the performance of the developed interface for mercury detection in real-world samples.

Main Methods:

  • Exfoliation of bulk molybdenum disulfide using a biomass extract.
  • In situ deposition of nitrogen and sulfur co-doped carbon quantum dots onto exfoliated molybdenum disulfide.
  • Characterization of the resulting 2D heterojunction nanocomposite.
  • Testing the nanocomposite for mercury (II) ion detection in blood samples.

Main Results:

  • The nanocomposite exhibited synergistic photo-physical properties and surface functionalities.
  • Selective binding of mercury (II) ions facilitated charge transfer across the 2D heterojunction.
  • Rapid detection of mercury (II) ions with a response time of approximately 90 seconds.
  • Achieved a limit of detection of 31 picomolar and photosensitivity of 16.6 A cm-2 M-1.
  • Successfully tested for mercury (II) detection in Labeo rohita fish blood samples.

Conclusions:

  • The developed 2D heterojunction offers a promising platform for rapid and sensitive mercury (II) ion detection.
  • The synergistic integration of carbon quantum dots and molybdenum disulfide enhances detection capabilities.
  • The method demonstrates potential for environmental and biological sample analysis of mercury toxicity.