Applications Of Electrochemical Surface Plasmon Resonance (EC-SPR)

Electrochemical surface plasmon resonance (EC-SPR) is a combination of surface plasmon resonance with some electrochemical method. The gold film that excites the surface plasmons is used as working electrode in the electrochemical cell. Both electrochemical and optical information are simultaneously obtained by in situ electrochemistry and SPR tests. As a sensitive analytical technique, EC-SPR has been used for detecting metal ion traces, characterizing electrochemical processes on the electrode surface, examining the formation of nanofilms and tracking their configurations. In this thesis, SPR combined with time differential method, by obtaining the change rate of SPR dip shift (d dt), was applied to investigate interfacial electrochemical processes. The main results were shown as follows:(1) Conformational change accompanying with the oxidation process of the ferrocenylalkanethiol self-assembled monolayers (SAMs) was investigated by EC-SPR and electrochemical quartz crystal microbalance (EQCM) combined with difference method. Both the peak potentials of d θ/dt-E and dAf/dt-E were compared to the peak potential of I-E curve at different potential scan rate. The results show that both the migration of ferrocene mercaptan alkyl chain and the hydration of SAMs are rapid process, and the rotation of Cp is a slow process.(2) The redox of Hg2+and following Hg/Au amalgam process on polycrystal gold film were investigated by EC-SPR with time differential method. The relation between the peak potentials of I-E and d△θ/dt responses was analyzed. A simulation based on Frensenel’s theory revealed the Hg/Au amalgam process with the eletrodeposition of Hg2+...