Electrogenerated Chemiluminescence On Gold Nanoparticle And Carbon Nanotube Modified Electrodes

Chemically modified electrode has been widely used in electrogenerated chemiluminescence (ECL) in the past several decades. Recently, special attentions have been paid to nanoparticle modified electrodes. In this dissertation, the principles and recent developments in the field of ECL, the properties of chemically modified electrodes and their applications in analytical chemistry were reviewed. Gold nanoparticle and carbon nanotube modified electrodes were fabricated and the behaviors and the mechanisms of luminol and lucigenin ECL systems on nanoparticle modified electrodes were studied. The main results are as follows:1. The electrogenerated chemiluminescence of lucigenin on a gold nanosphere self-assembled gold electrode in neutral and alkaline solutions was studied under conventional cyclic voltammetry (CV) conditions. The gold nanosphere self-assembled gold electrode exhibited excellent ECL property for the lucigenin ECL system. In alkaline solution, one sharp peak and a shoulder peak were observed at -0.24 and -0.36 V, respectively, on the curve of ECL intensity versus potential and the intensities of these peaks were enhanced by 2-3 orders of magnitude compared with those on a bare gold electrode. In neutral solution, two strong ECL peaks (ECL signal/noise = 100 — 1000) were also observed on a gold nanosphere self-assembled gold electrode, whereas the two ECL peaks were undetectable on a bare gold electrode. These peaks were found to depend on gold nanospheres on the surface of the electrode, potential scan direction and scan rate, the presence of O₂ or N₂, the pH, the concentration of lucigenin and electrolyte, and surfactant. The emitter of all ECL...