UVicSpace

Design, fabrication, and electrochemical surface plasmon resonance analysis of nanoelectrode arrays

Show simple item record

dc.contributor.author Atighilorestani, Mahdieh
dc.date.accessioned 2017-08-30T14:31:50Z
dc.date.available 2017-08-30T14:31:50Z
dc.date.copyright 2017 en_US
dc.date.issued 2017-08-30
dc.identifier.uri http://hdl.handle.net/1828/8501
dc.description.abstract Recent advances in nanofabrication techniques have opened up new avenues and numerous possible applications in both nanoscale electrochemistry and analytical nanoscience by enabling the fabrication of reproducible nanoelectrodes with different new geometries. Nanoelectrodes exhibit advantages including enhanced mass transport, higher current densities, improved signal-to-noise ratios, and lower ohmic drop. In this dissertation, the use of nanoelectrodes in the electrochemical response properties investigations or in the spectroelectrochemical studies is the unifying factor among all the chapters. First (in Chapter 4), we presented a direct comparison between the electrochemical characteristics of two finite nanoelectrodes arrays with different geometries: 6 × 6 recessed nanodiscs and nanorings microarrays. Using computational methods, it was demonstrated that the electrode geometry’s parameters have a drastic influence on the mass transport properties of the nanoelectrodes. The results presented here are the first combination of experimental and numerical studies that elucidate the transport on nanoring electrode arrays. The comparison of the electrochemical behavior between nanostructures using full 3D simulations is also unique. Second, we have provided a comprehensive numerical study on the redox cycling performance properties of a 6 × 6 recessed nanorings-ring electrode array configuration. The simulation results were in good agreement with the experimental data. After validating the model against experiments, a comprehensive computational investigation revealed avenues to optimize the performance of the structure in terms of geometric parameters and scan rates. The second half of this dissertation is comprised of the spectroelectrochemical studies. The combination of surface plasmon resonance with electrochemistry presents new paths to investigateredox reaction events at the electrode surface since it brings an additional dimension to the classical electrochemical approaches. Third, we have reported a novel active plasmonic device based on a new switching mechanism for the nanohole electrodes array to bridge between photonics and electronics at nanoscales. The inner surfaces of the nanohole electrodes in the array were coated with an electroconductive polymer, polypyrrole, (PPy). Then, it was shown that light transmitted through the PPy- modified nanohole electrodes can be easily tuned and controled by applying an external potential. We were also able to switch on and off the transmitted light intensity through the modified nanohole arrays by potential steps, demonstrating the potential of this platform to be incorporated into optoelectronic devices. Finally, we have fabricated larger area plasmonic periodic nanopillar 3D electrodes using a rapid, high-throughput, and cost-effective approach: the laser interference lithography. Then, the electrochemical behavior of these electrodes was investigated both experimentally and computationally. The properties were ‘compared with a flat electrode with an equivalent geometric area. Afterward, we have successfully probed the changes in the concentration of a reversible redox pair near the electrode surface induced by various applied potentials, in an in-situ EC-SPR experiment. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Nanoelectrodes en_US
dc.subject Nanoelectrode arrays en_US
dc.subject Spectroelectrochemistry en_US
dc.subject surface plasmon resonance (SPR) en_US
dc.subject Interference lithography en_US
dc.subject Nanohole array en_US
dc.subject Plasmonics en_US
dc.subject COMSOL en_US
dc.subject Simulation en_US
dc.subject Electrochemistry en_US
dc.subject EC-SPR en_US
dc.title Design, fabrication, and electrochemical surface plasmon resonance analysis of nanoelectrode arrays en_US
dc.type Thesis en_US
dc.contributor.supervisor Brolo, Alexandre Guimaraes
dc.degree.department Department of Chemistry en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.description.scholarlevel Graduate en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search UVicSpace


Browse

My Account

Statistics

Help