研究目的
Investigating the plasmonic origin of the unusual purple color of the intermetallic compound AuAl2 and exploring its potential applications.
研究成果
The study confirms the plasmonic origin of the purple color of AuAl2, with SP energy approximately 2.1 eV, lower than in gold. AuAl2 is highly resistant to oxidation and shows potential for applications in areas such as photothermal therapy, solar steam generation, and plasmonic catalysis, especially in nanoparticle form where it exhibits strong light absorption.
研究不足
The study notes that SPs in purple gold are lossier than in pure gold, which may limit their use in certain applications. The accuracy of the SP dispersion relation for AuAl2 may be affected by inaccuracies in the published dielectric function or deviations from perfect stoichiometry in the film.
1：Experimental Design and Method Selection:
The study involved launching surface plasmons (SPs) in thin AuAl2 films to confirm the plasmonic origin of its purple color. The SP dispersion relation was measured, and the films were used to measure the index of refraction of sucrose solutions using standard SP resonance sensing.
2：Sample Selection and Data Sources:
AuAl2 films were prepared by e-beam evaporation of a stack of Ti/Au/Al/Au/Al onto the hypotenuse of a right prism made from high refractive index glass (NS-F11). Reference films of pure gold were also prepared for comparison.
3：1). Reference films of pure gold were also prepared for comparison.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: High refractive index glass prism (NS-F11), e-beam evaporation system, Ti, Au, and Al for film preparation, annealing setup, phase-polarization contrast measurement setup.
4：Experimental Procedures and Operational Workflow:
After thin film deposition, the prism was annealed at 300 °C for 30 min under nearly oxygen- and water-free conditions. SPs were launched in the Kretschmann configuration, and reflectance spectra were measured as a function of incident angle to construct the SP dispersion relation.
5：Data Analysis Methods:
The location of the SP was determined using the dielectric functions for the metal film and the medium in contact with the film. Reflectance changes were analyzed to measure the index of refraction of sucrose solutions.
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