Electrogenerated Chemiluminescence Sensor Based on a Self‐Assembled Monolayer of Ruthenium(II)‐bis(2,2′‐bipyridyl)(aminopropyl imidazole) on Gold Deposited Screen Printed Electrode

Abstract

Abstract A new electrogenerated chemiluminescence (ECL) sensor based on a self‐assembled monolayer (SAM) of Ru(II)‐bis(2,2′‐bipyridyl)(aminopropyl imidazole) on a gold‐deposited screen printed electrode (SPE) has been developed. Since the ECL emission of the Ru(II)‐bis(2,2′‐bipyridyl)(aminopropyl imidazole) complex can be easily obtained at an applied potential of less than +0.8 V, the possibility of the oxidation of the Ru‐complex SAM formed on gold‐deposited SPE electrode surface was greatly diminished and thus the stability of the resulting Ru‐complex SAM‐based ECL sensor was enormously enhanced compared to the previously reported Ru(bpy) 3 2+ ‐derivative monolayer‐based ECL sensors with applied potentials of more than +1.0 V. In the present study, the gold deposited SPE with carbon nanotube paste was used in order to increase the amount of Ru‐complex immobilized on the electrode surface through a large surface area of deposited gold nanoparticles causing good charge transport and thus leading to the increased sensitivity of the ECL sensor. The ECL characteristics obtained with the present Ru‐complex SAM‐based ECL sensor are compared with those obtained with other Ru(bpy) 3 2+ ‐SAM‐based ECL sensors.