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Metal nanostructures: electrochemical and photonic properties

Munini, Fabio (2006) Metal nanostructures: electrochemical and photonic properties. Master of Science thesis, Dublin City University.

Abstract
The aim of the work is to fabricate nanoporous gold electrodes of controllable structure and texture. These nanostructures were created by self-assembling colloidal polystyrene latex nanospheres into closed-packed arrays on a fluorine-doped thin oxide glass surface, followed by electrodeposition of gold within the interstitial voids and finally removing the template. The nanospheres diameters were 240, 430, 600 and 820 nm Dip-coating technique was exploited to create ordered arrays Latex polystyrene opals were produced by slowly withdrawing hydrophilic FTO glass slides from a 2-10% (w/w) nanospheres suspensions with feedrate and acceleration ranging from 0 001 to 0 006 mm s 1 and from 0 003 to 0 018 mm s'2, respectively Electrochemical reduction of metal complex ions, obtained from Techni Gold 25 plating bath and NaAuCU solutions, was performed by applying an overpotential between -0 1 and -1 0 V with respect to a Ag/AgCl reference electrode. The final material, a photonic crystal with an inverse opal morphology arranged in a multidomain (polycrystalline) structure with the domain size between 10 and 10 (im. The nanoporous gold electrodes were found to have a surface area at least 2 orders of magnitude greater than the flat metal surfaces, corroborating the possibility of being applied for electrocatalysis. Furthermore, preliminary investigation using trans- 1,2-two (4-pyndyl) ethylene (BPE) as test molecule lead to significant SERS response of these nanostructures, confirming their potential use for Raman-based sensing applications.
Metadata
Item Type:Thesis (Master of Science)
Date of Award:2006
Refereed:No
Supervisor(s):Forster, Robert J.
Uncontrolled Keywords:Nanoporous gold electrodes
Subjects:Physical Sciences > Electrochemistry
Physical Sciences > Nanotechnology
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
ID Code:18099
Deposited On:09 May 2013 10:57 by Celine Campbell . Last Modified 09 May 2013 10:57
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