Electrochemical Sensor Based on Polydopamine-Coated Silver Nanowire/Defect-Ridden UiO-66-NH2 Nanocomposites for Trace Detection of Cd(II) and Pb(II) Ions in Water
The research group of Dr. Paramita Das [Department of Chemical Engineering] developed an advanced electrochemical sensing platform for the trace detection of Cd(II) and Pb(II) ions in water. The developed sensor is based on a glassy carbon electrode (GCE) modified with a thin film of polydopamine-coated silver nanowire and a defect-ridden UiO-66-NH2 nanocomposite, enabling highly sensitive and selective detection of heavy metal ions. The optimized AgNW@PDA24/UiO-66-NH2/GCE sensor demonstrates an LOD of 25.2 nM for Cd(II) and 9.8 nM for Pb(II) ions and high sensitivity of 7.18 and 18.2 ?A ?M-1 cm-2, along with a wide linear range of 0.05-1.1 and 0.05-0.7 ?M, respectively. The sensor exhibits excellent reproducibility, reusability, and operational stability, making it suitable for practical applicability. Furthermore, the team has developed a paper-based flexible sensor using the optimized nanocomposite ink, demonstrating an LOD of 153 nM for Cd(II) and 81 nM for Pb(II) ions, highlighting its potential for on-site and rapid monitoring of real water samples. For more details, kindly visit: https://pubs.acs.org/doi/10.1021/acsanm.5c03845
