研究目的
To characterize the plasmonic properties of spherical gold nanoparticles dispersed in ZnO matrix and estimate the dielectric constant of the matrix.
研究成果
The study demonstrates that the LSPR is very sensitive to the environment rather than the changes in the particle size. Simulations based on Mie’s theory were effectively used to estimate the changes in the dielectric constant of the ZnO matrix. The findings suggest that LSPR is a sensitive tool for analyzing the environment or the matrix and arriving at a quantitative estimate of the dielectric constant.
研究不足
The study is limited to spherical gold nanoparticles and does not explore the effects of nanoparticle shape on plasmonic properties. The sensitivity of LSPR to the environment rather than particle size changes is highlighted, but the study does not extensively investigate the mechanisms behind the changes in dielectric constant of the ZnO medium on annealing.
1：Experimental Design and Method Selection:
The study involves the characterization of plasmonic properties of spherical gold nanoparticles dispersed in ZnO matrix using Mie theory for simulations and optical absorption experiments for empirical data.
2：Sample Selection and Data Sources:
ZnO-Au nanostructures with varying Au composition and annealing temperatures were prepared by electrochemical method and RF sputtering.
3：List of Experimental Equipment and Materials:
UV-vis spectrophotometer for optical absorption measurements, XRD using Cu-Kα radiation for structural characterization.
4：Experimental Procedures and Operational Workflow:
Optical absorption experiments were conducted to observe the LSPR peaks, and XRD was performed to confirm the presence of Au and ZnO.
5：Data Analysis Methods:
Mie theory simulations were used to estimate the dielectric constant of the ZnO matrix based on the observed LSPR shifts.
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