Title:
Surface chemical studies of metal oxide nanocrystals supporting infrared localized surface plasmon resonances

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Author(s)
Hu, Weize
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Filler, Michael A.
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Abstract
Heavily doped metal oxide nanocrystals exhibit a tunable localized surface plasmon resonance in the infrared, a property that is promising for applications in photonics, spectroscopy, and photochemistry. Although the plasmonic metal oxide nanocrystals were first demonstrated nearly ten years ago, the interplay between localized surface plasmon, dopants and surface adsorbates remains elusive. In this thesis, we use time-resolved infrared Fourier transform spectroscopy to identify the previously unknown, yet critical, role of gas-phase redox reaction on plasmonic properties in colloidal synthesized indium tin oxide, aluminum doped zinc oxide and gallium doped zinc oxide nanocrystals. Our experiments identify the key role of dopants and redox reaction on the infrared optical properties and show that changes to interstitial oxygen concentration are critical to the LSPRs in metal oxide nanocrystals. For the first time, we also show that the deep subwavelength confinement of infrared light by plasmonic nanocrystals can accelerate a heterogeneous chemical process. This work brings attention to low-energy localized surface plasmon resonances and their coupling with surface adsorbates. The fundamental insights of surface chemical studies promise unprecedented control of metal oxide plasmonic properties and functionalities.
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Date Issued
2018-07-23
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Dissertation
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