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Improving Electrochemical Pb2+ Detection Using a Vertically Aligned 2D MoS2 Nanofilm.

Jae-Hoon Hwang1, Md Ashraful Islam2,3, Heechae Choi4

  • 1Department of Civil, Environmental, and Construction Engineering , University of Central Florida , Orlando , Florida 32816 , United States.

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A new sensor using vertically aligned molybdenum disulfide (MoS2) nanofilms effectively detects lead ions (Pb2+) in water. This advancement offers high sensitivity and reliability for environmental heavy metal monitoring.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Electrochemistry

Background:

  • Molybdenum disulfide (MoS2) nanofilms show promise for environmental applications.
  • Heavy metal detection in water remains a critical environmental challenge.
  • MoS2 nanofilm sensors have not been previously applied for heavy metal detection.

Purpose of the Study:

  • To develop and evaluate a novel sensor for in situ lead ion (Pb2+) detection in water-related environmental samples.
  • To investigate the performance of vertically aligned two-dimensional (2D) MoS2 nanofilms for heavy metal sensing.
  • To compare the sensitivity and reproducibility of the developed sensor with existing methods.

Main Methods:

  • Fabrication of a sensor using vertically aligned 2D MoS2 nanofilms with exposed edges.
  • Utilized square wave anodic stripping voltammetry (SWASV) for Pb2+ detection.
  • Performed density functional theory (DFT) calculations to understand Pb2+ adsorption mechanisms on MoS2.

Main Results:

  • The sensor demonstrated an excellent linear relationship for Pb2+ detection between 0 and 20 ppb.
  • Achieved an improved limit of detection (LOD) of 0.3 ppb in a tap water environment.
  • Vertically aligned MoS2 exhibited 2.6 times higher sensitivity than horizontally aligned MoS2 and improved reproducibility.

Conclusions:

  • The developed vertically aligned 2D MoS2 sensor is highly effective for sensitive and reliable Pb2+ detection in real drinking water.
  • DFT calculations confirmed superior Pb2+ adsorption on the edge-exposed MoS2, explaining the enhanced performance.
  • This work paves the way for advanced MoS2-based sensors in environmental monitoring.