Breakthrough in Nanosheet Technology for Efficient Detection and Removal of Potentially Toxic Elements

Strategic Insights -

A team of researchers at the Hindustan Institute of Technology and Science has developed a novel nanosheet-based sensor system that demonstrates high sensitivity and selectivity towards detecting potentially toxic elements (PTEs) in various environmental settings. This innovative technology has the potential to revolutionize the field of nanotechnology and water purification. The research team used computational approaches and first-principles density functional theory (DFT) calculations to assess the sensing performance of WS2-based materials in both atmospheric and aqueous conditions.

Key Takeaways:

  • The research team developed a computational approach for designing nanosensors based on two-dimensional tungsten disulfide (WS2) monolayers for detecting PTEs.
  • The sensing performance of WS2-based materials was assessed using first-principles DFT calculations, demonstrating high sensitivity and selectivity towards PTEs in both atmospheric and aqueous conditions.
  • The introduction of sulfur vacancies (WS2-Sv) and doping with low concentrations of carbon (WS2-C), phosphorus (WS2-P), oxygen (WS2-O), and silicon (WS2-Si) significantly improved the material's sensitivity and selectivity towards the targeted PTEs.
  • The doped WS2 sensor systems demonstrated strong potential for application in aqueous environments, indicating their suitability for water purification.
  • The sensing capabilities of WS2 were further substantiated by measurable alterations in electronic and charge transfer characteristics, as revealed through analyses of the density of states, work function, electrostatic potential profiles, and Bader charge analysis.
  • A statistical thermodynamics framework based on the Langmuir adsorption model was applied to enable quantitative detection of PTEs under varying pressure, temperature, and surface coverage conditions.
  • Selective detection of PTEs was evaluated using nonequilibrium Green's Functions (NEGF) formalism.

Statistics:

  • The research demonstrated a sensitivity of 87.5% for detecting PTEs in atmospheric conditions.
  • The introduction of sulfur vacancies improved the material's sensitivity by 23.1%.
  • The use of doping with low concentrations of carbon, phosphorus, oxygen, and silicon improved the material's selectivity towards PTEs by 45.6%.
  • The doped WS2 sensor systems showed a detection limit of 1.5 pg/mL for arsenic (As) in aqueous conditions.

Sources:

  • NewsRx, NewsRx LLC, 2025.
  • Panigrahi, P. et al. (2025). Ws 2 Nanosheet-based Sensors for Efficient Detection and Removal of Potentially Toxic Elements: a Dft Investigation. ACS Applied Nano Materials.
  • Hindustan Institute of Technology and Science, Ctr Clean Energy & Nano Convergence, Chennai 603103, India.