Abstract
Multiwalled carbon nanotubes (MWCNTs) were individually coated with conducting, semiconducting, and insulating materials. The coatings used were crystalline Au nanoparticles, TiO 2 nanoclusters, and amorphous SiO 2 nanoshells, respectively. The synthesis strategy involves a combination of self-assembly and the sol–gel technique. The synthesized nanostructures were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray diffraction. We investigated the nonlinear optical and optical limiting properties using an open-aperture Z-scan technique and fluence-dependent transmittance measurements. Compared to the pristine MWCNTs, those with Au-, TiO 2-, and SiO 2-coatings demonstrate superior, equivalent, and inferior nonlinear optical and optical limiting properties, respectively.
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