Fabrication of A New Solid-state Electrochemiluminescent Sensing Interface for Detection of Tripropylamine

KeyWord:electrochemiluminescence  Nafion  multi-wall carbon nanotubes  Ru-PtNPs  tripropylamine

Abstract:

      A Ru£¨bpy£©2+3-based solid-state electrochemiluminescence£¨ECL£© sensor was fabricated successfully.Firstly,Ru£¨bpy£©2+3/Pt nanoparticles£¨Ru-PtNPs£© were obtained via electrostatic interactions between the positively charged Ru£¨bpy£©2+3 and negatively charged Pt nanoparticles.Then,Ru-PtNPs were attached to the multi-wall carbon nanotubes£¨MWCNTs£©-Nafion homogeneous composite film coated GCE by typical ion-exchange between the positively charged Ru-PtNPs and Nafion,electrostatic interactions between positively charged Ru-PtNPs and negatively charged MWCNTs in Nafion.As a result,a large amount of luminescence probes Ru£¨bpy£©2+3 were immobilized onto the electrode to keep their electrocatalytic activity toward the electrooxidation of tripropylamine£¨TPA£©.The characteristic of the proposed sensor was investigated by cyclic voltammetry£¨CV£©,scanning electron microscope£¨SEM£© and electrochemiluminescent£¨ECL£© method.The ECL sensor showed a good linear response to concentration of TPA in the range of 6.67¡Á10-7-1.00¡Á10-3 mol?L-1 with a detection limit£¨S/N=3£© of 3.3¡Á10-7mol?L-1.