(Pc)Eu(Pc)Eu[trans-T(COOCH₃)₂PP]/GO Hybrid Film-Based Nonenzymatic H₂O₂ Electrochemical Sensor with Excellent Performance

A facile approach was developed for preparing the multilayer hybrid films of mixed (phthalocyaninato) (porphyrinato) europium(III) triple-decker compound (Pc)Eu(Pc)Eu[ trans -T(COOCH 3 ) 2 PP] ( 1 ) and graphene oxide (GO) using the solution-processing QLS method. The combination of the nature of relatively high conductivity and great surface area for GO with the electroactive and semiconductive triple-decker compound in ITO electrode renders the hybrid film excellent sensing property for H 2 O 2, due to the optimized triple-decker molecular packing in the uniform-sized nanoparticles (ca. 70 nm) formed on the GO surface. The amperometric responses are linearly proportional to the concentration of H 2 O 2 in the range of 0.05–1800 μM with a fast response time of 0.03 s μM –1, a low detection limit of 0.017 μM, and good sensitivity of 7.4 μA mM –1 . The present work represents the best result of tetrapyrrole-based nonenzymatic electrochemical sensor for H 2 O 2 . Nevertheless, the triple-decker/GO/ITO also shows excellent stability, reproducibility, and selectivity, indicating the great potential of electroactive tetrapyrrole rare earth sandwich compounds in combination with GO in the field of nonenzymatic electrochemical sensors.