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dc.contributor.advisor Halas, Naomi J.
dc.creatorAveritt, Richard Douglas
dc.date.accessioned 2009-06-04T08:34:02Z
dc.date.available 2009-06-04T08:34:02Z
dc.date.issued 1998
dc.identifier.urihttp://hdl.handle.net/1911/19240
dc.description.abstract The chemistry, optical properties, and femtosecond electron dynamics of gold nanoshells are described. The gold nanoshells consist of Au-coated Au$\sb2$S nanoparticles prepared via aqueous phase chemistry using HAuCl$\sb4$ and Na$\sb2$S. During the course of the reaction, the plasmon-related absorption peak first shifts from $\sim$650 nm out to $\sim$900 nm, then shifts back to $\sim$650 nm. It is shown, using generalized Mie scattering theory, that this plasmon peak shift is determined by the relative thickness of the Au shell and the Au$\sb2$S core diameter. This understanding of the optical properties of these nanoparticles is used to elucidate the nanoparticle growth kinetics. The dynamics of the electrons in the Au shell are studied with femtosecond pump-probe spectroscopy using a cavity-dumped Ti:sapphire laser. The induced change in the transmission of the gold nanoshell films studied has a lifetime of $\sim$1.6 ps. The origin of the measured signal is shown to be due to the creation of a hot electron distribution that returns to equilibrium via electron-dissipative interactions with the nanoparticle core and the embedding medium.
dc.format.extent 169 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectPhysical chemistry
Condensed matter physics
Optics
dc.title Gold nanoshells: Optical properties and femtosecond electron dynamics
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Chemistry
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Doctoral
thesis.degree.name Doctor of Philosophy
dc.identifier.citation Averitt, Richard Douglas. "Gold nanoshells: Optical properties and femtosecond electron dynamics." (1998) PhD diss., Rice University. http://hdl.handle.net/1911/19240.


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