Abstract
Stannum nanocaps were prepared by evaporating Sn on self-assembled monolayer arrays of SiO2 nanoparticles. Surface morphologies, structure, and optical properties of composite nanoparticles were characterized and investigated using scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) and UV-Vis-NIR spectrophotometer. The results show that the composite nanoparticles are cap-shaped and surface plasmonic resonance absorption peaks move to the near-infrared region as the SiO2 diameter increases and Sn cap thickness increases.
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