Plasmon-exciton coupling in nanostructured materials has been a well-studied approach for generating unique optical properties.  A Fano resonance is one type of optical phenomenon that may be generated by plasmon-exciton coupling.  Our group recently demonstrated a strong Fano resonance in colloidal suspensions containing silver nanoplatelets coated with a thin layer of J-aggregate dye.  As a follow on to this work, we recently initiated efforts to further explore the impact of plasmon-exciton coupling on the optical, catalytic, and charge injection properties of titanium dioxide.  As a model nanostructure for studying this impact, we endeavored to fabricate a nanocomposite that contained titanium dioxide nanorods, silver nanoplatelets, and a J-aggregate dye.  Hence, in this presentation we detail our efforts to fabricate titanium dioxide nanorods that are decorated with silver nanoplatelets and coated with a J-aggregate dye.  Our approach for fabricating titanium dioxide nanorods is first described.  Next, we describe a novel technique for growing silver nanoplatelets on the surface of the rods, followed by the electrostatic adsorption of a J-aggregate dye on the surface of the TiO<sub>2</sub>/Ag nanocomposite.  In terms of our attempts to elucidate the impact of plasmon-exciton coupling on the transfer of charge from the J-aggregate dye to the titanium dioxide, we detail results obtained from transient absorption and fluorescence measurements.  Finally, we describe our initial efforts to characterize the catalytic behavior of the nanocomposite via the degradation of methylene blue, industrial toxins, and chemical agent simulants.

Exploring plasmon-exciton coupling at the surface of TiO<sub>2</sub> nanorods

253rd National Meeting (2017)

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Exploring plasmon-exciton coupling at the surface of TiO2 nanorods

Exploring plasmon-exciton coupling at the surface of TiO₂ nanorods