Chemiresistor sensor based on ion-imprinted polymer (IIP)-functionalized rGO for Cd(II) ions in water

This study reports the design and development of a novel chemiresistor (CR) sensor using ion imprinted polymer (IIP)-functionalized reduced graphene oxide (rGO) [IIP/rGO-CR] for cadmium ions (Cd(II)) determination in water. The consisted CR transducer made rGO channel bridging source drain electrodes prepared by self-assembly thermal reduction (GO) on Au interdigitated chip fabricated Si/SiO2 substrate. IIP was then grafted surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization with polyethylenimine (PEI) methylacrylic acid (MAA) as dual functional monomers Cd(II) template through UV light-initiated copolymerization. functionalized acted an effective recognition element that modulated resistance rGO-CR upon binding Cd(II), enabling detection at ppb level aqueous solutions. IIP/rGO-CR worked effectively linear range 2～200 achieved limit (LOD) 0.83 ppb, which is lower than World Health Organization guidelines 3 drinking water quality. developed showed high selectivity against variety trace heavy metal found good stability up to 60 days when stored room temperature Further, successfully applied analyzing spiked tap, lake river waters 94.5%–113.5% recovery, demonstrating degree accuracy even complex samples. Our results illustrated provides potential platform sensitive, robust low-cost environmental analysis