Selective immobilization of tris(2,2′-bipyridyl)ruthenium (II) onto array electrode for solid-state electrochemiluminescene sensor fabrication

An effective method for selective immobilization of tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)32+) onto one target electrode surface based on the electrodeposition of RuDS NPs (Ru(bpy)32+ doped silica nanoparticles)/chitosan composite film is presented in this paper. Ru(bpy)32+ was selectively deposited onto four individual electrodes in an Au electrode array. The results demonstrate the possibility of selective immobilization of Ru(bpy)32+ onto array electrodes and selective immobilization of different ECL composite. Therefore have potential applications in bioanalysis, capillary electrophoresis and drug screening.RuDS NPs and the resulting composite film were characterized by UV–vis spectroscopy, transmission electron microscopy (TEM) and Field emission-scanning electron microscope (FE-SEM). The electrochemiluminescence (ECL) sensor based on the composite film modified electrode exhibited excellent reproducibility, stability and sensitivity for the detection of tri-n-propylamine (TPA). The linear range was from 1 × 10−10 to 1 × 10−6 M (R2 = 0.9954) with the detection limit of 5 × 10−11 M.