Gold nanoshells: Optical properties and femtosecond electron dynamics

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dc.contributor.advisorHalas, Naomi J.en_US
dc.creatorAveritt, Richard Douglasen_US
dc.date.accessioned2009-06-04T08:34:02Zen_US
dc.date.available2009-06-04T08:34:02Zen_US
dc.date.issued1998en_US
dc.description.abstractThe 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.en_US
dc.format.extent169 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS E.E. 1998 AVERITTen_US
dc.identifier.citationAveritt, Richard Douglas. "Gold nanoshells: Optical properties and femtosecond electron dynamics." (1998) Diss., Rice University. <a href="https://hdl.handle.net/1911/19240">https://hdl.handle.net/1911/19240</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/19240en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectPhysical chemistryen_US
dc.subjectCondensed matter physicsen_US
dc.subjectOpticsen_US
dc.titleGold nanoshells: Optical properties and femtosecond electron dynamicsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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