Ultrasound-assisted synthesis of nanoscale coordination polymers and their application as enzyme-free electrochemical biosensors for H2O2

Coordination polymers attract increasing attention as unique multifunctional hybrid materials. However, researches of CPs as electrochemical biosensors are rare. In this work, we developed a surfactant-assisted sonochemical method to synthesize nanoscale coordination polymers ([Cu(tyr)2]n and [Cu(asp)]n, nanorods with width of 100-200 nm), based on which enzyme-free electrochemical biosensors for H2O2 were prepared. Their sensing performance was improved by nanocrystallization, giving detection limits of 1.0×10−5 and 2.0×10−6 mol dm−3, linear ranges of 4.0×10−5-6.3×10−3 and 3.4×10−5-6.8×10−4 mol dm−3, and sensitivity of 70 and 110 mA mol−1 dm3 cm−2, respectively.