Breakthrough in Nanotechnology: Development of CuS2/CQDs Nanocomposite Sensor

Strategic Insights -

Researchers from KLE Technological University in India have made a significant discovery in the field of nanotechnology by developing a CuS2/CQDs nanocomposite sensor for detecting p-hydroxybenzoic acid (pHBA) in cosmetic and environmental samples. The sensor, which combines carbon quantum dots (CQDs) with CuS2, demonstrates excellent sensitivity and selectivity, with a detection limit of 1.64 x 10^-7 M and a linear detection range of 1.0 x 10^-5 M to 6.0 x 10^-6 M.

Key Takeaways:

  • The CuS2/CQDs nanocomposite sensor is capable of detecting pHBA in cosmetic and environmental samples with high sensitivity and selectivity.
  • The sensor was developed using a hydrothermal process via a green method, utilizing lablab purpureus peels as a carbon precursor.
  • The surface morphology of the CuS2/CQDs nanocomposite was characterized using Raman spectroscopy, Transmission electron microscopy (TEM), Field Emission scanning electron microscopy (FE-SEM), and X-ray diffraction.
  • Electrochemical impedance spectroscopy (EIS) showed improved electron transfer kinetics at the modified electrode, with a two-fold increase in anodic peak current compared to bare CPE.
  • Differential pulse voltammetry (DPV) revealed a detection limit of 1.64 x 10^-7 M and a limit of quantification of 5.49 x 10^-7 M.
  • The sensor was successfully applied to real samples, including cosmetics (cream and lipstick) and water samples (lake and bore), demonstrating good selectivity, sensitivity, and reproducibility.
  • The research was funded by the St. Joseph's University Research and Innovation Council, the Department of Science & Technology (India), the Science and Engineering Research Board (SERB), Government of India, and the Princess Nourah bint Abdulrahman University.

Statistics:

  • Detection limit: 1.64 x 10^-7 M
  • Linear detection range: 1.0 x 10^-5 M to 6.0 x 10^-6 M
  • Limit of quantification: 5.49 x 10^-7 M
  • Two-fold increase in anodic peak current at modified electrode compared to bare CPE (Source: Electrochemical impedance spectroscopy)

Sources:

  • Carbon Quantum Dots Derived From Lablab Purpureus Peels and Cus2 Nanocomposite Sensor for P-hydroxybenzoic Acid Detection In Cosmetic and Environmental Samples. Diamond and Related Materials, 2025;159.
  • Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Diamond and Related Materials - www.journals.elsevier.com/diamond-and-related-materials/)
  • NewsRx. Findings from KLE Technological University in Nanocomposites Reported (Carbon Quantum Dots Derived From Lablab Purpureus Peels and Cus2 Nanocomposite Sensor for P-hydroxybenzoic Acid Detection In Cosmetic and Environmental Samples). Journal of Physics Research. November 4, 2025; p 573.