Dynamics of absorption peaks in plasmonic nanostructures

The research concentrated on examining how the purification process impacts the characteristics of gold nanorods coated with cetyltrimethylammonium bromide (CTAB) molecules via experimental, theoretical, and empirical model analysis. By investigating different rotational speeds over a consistent 10-minute period across various shapes and absorbance ratios, the study sought to comprehend the relationship between peak absorbance position, wavelength, and absorbance levels at different revolution per minute (rpm) values. Notable alterations in absorbance peaks were observed with higher centrifugation speeds, resulting in reduced levels of transverse and longitudinal absorbance. Nonetheless, the position of the transverse peak remained constant, suggesting a uniform spectral behavior despite varying centrifugation conditions. The analysis of UV-visible spectra unveiled unique plasmon resonance peaks, emphasizing the interplay between material composition and optical characteristics. Additionally, the investigation delved into the connection among centrifugation speed, diffusion coefficients, and nanoparticle behavior, demonstrating the technique's influence on nanoparticle separation processes. In summary, this study offers important insights into the behavior of gold nanorods during centrifugation, elucidating its transformative impact on system properties and providing direction for future explorations and applications in this domain.