Fabrication, characterization and optical properties of three-dimensional colloidal gold nanostructures

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dc.contributor.authorAddison, Christopher Jamesen_US
dc.contributor.supervisorBrolo, Alexandre Guimaraesen_US
dc.date.accessioned2008-04-10T06:04:49Z
dc.date.available2008-04-10T06:04:49Z
dc.date.copyright2005en_US
dc.date.issued2008-04-10T06:04:49Z
dc.degree.departmentDepartment of Chemistry
dc.description.abstract3-Dimensional nanostructures were constructed through the alternate immersion of a derivatized glass slide in solutions of propanedithiol and gold nanoparticles. The size and shape of the surface features could be controlled based on the number of nanoparticle depositions. Characterization of the substrates was performed using W-Vis spectroscopy and atomic force microscopy. The multilayer nanoparticle substrates were examined for their suitability in surface-enhanced Raman scattering (SERS) by obtaining the SERS spectrum of oxazine-720 on the substrates. A dramatic increase in the SERS signal is noted with increasing nanoparticle layers and reaches a maximum for 11 nanoparticle-layer depositions. The enhancement is attributed to the underlying surface morphology: Surface features on the order of 40 nm in size yield the greatest SERS enhancement due to surface plasmon (SP) excitation. The non-linear optical properties of colloidal nanostructures were examined using second harmonic generation (SHG). A pronounced second harmonic emission was noted for 13 nanoparticle layers and was attributed to SP excitation to yield surface-enhanced SHG. The self-assembly of gold nanorods to form 3-dimensional nanostructures was examined. While the self-assembly was not successful, the aggregated gold nanorods exhibited a large SERS enhancement. This suggests that the incorporation of gold nanorods into SERS substrates is a viable avenue for future research.en_US
dc.identifier.urihttp://hdl.handle.net/1828/800
dc.subject.lcshNanostructuresen_US
dc.titleFabrication, characterization and optical properties of three-dimensional colloidal gold nanostructuresen_US

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