| Summary: | 碩士 === 國立中央大學 === 材料科學與工程研究所 === 107 === The plasmonic response of metallic nanoparticles to external electromagnetic fields makes them attractive for a wide range of applications. In this study, the effect of the oxidation of gallium nanoparticles (Ga NPs) on their plasmonic properties is investigated. Electrochemical oxidation treatments, varying voltage and time, were carried out in order to increase experimentally the Ga2O3 shell thickness in the NPs.
In the result, a clear redshift of the peak wavelength is observed, and the gallium nanoparticles would deform. The less redshift by applying the higher voltage and vice versa. Several research implied that oxidation makes slight red-shift, we consider that the deformation is the main reason to cause large redshift. In order to make the spectrum tunable, we try to etch the gallium oxide layer after electrochemical oxidation by dipping in NaOH solution and it can make the spectrum blue-shift. The dissertation successfully figure out a method to make the spectrum of gallium nanoparticles tunable.
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