| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 102 === This research describes theoretical and experimental evaluations of electromagnetic fields around metallic nanostructures, such as separated by nano-scale distances. Nanostructures having different sizes and shapes were evaluated. The localized surface plasmon resonance (LSPR) of a nanoplasmonic particle is often considered to occur at a single resonant wavelength. However, the physical measures of plasmon resonance, namely the far-field measures of scattering, absorption, and extinction, and the near-field measures of surface-average or maximum electric field intensity, depend differently on the particle size, and hence may be maximized at different wavelengths. In this work, polyvinylpyrrolidone (PVP)-capped silver nanocubes (AgNCs) were synthesized using ethylene glycol as solvent and reducing agent through a simple, one-pot solvothermal method at 150°C. The SERS profiles obtained here serve as a basis to select silver nanocubes of specific size and composition with maximum SERS efficiency at their respective excitation wavelengths. Their potential for use as a versatile Raman signal amplifier was investigated experimentally using Rhodamin 6G as a probe molecule and theoretically by the three-dimensional finite difference time-domain (3D-FDTD) method. Furthermore, this approach offers a reliable prediction to involve the research about SERS substrates.
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