Papers by Keyword: Leaf-Like

Abstract: Uniform and monodisperse boehmite (γ-AlOOH) nanosheets with a thickness of less than 20 nm have been prepared by the hydrothermal treatment of amorphous boehmite. XRD and FTIR analysis showed that boehmite nanosheets have uniform and high degree of crystallinity. SEM micrographs indicated that boehmite has a leaf-like morphology with high anisotropy (with a length of 0.25～1 m and a width of 50～100 nm).

Abstract: A simple approach to the in situ deposition of well-crystallized SnO₂ nanocrystals on the surface of multiwalled carbon nanotubes (MWCNTs) in the ethanol solution system of SnCl2 was presented in this paper. The well-crystallized SnO₂ nanocrystals with small and uniform crystal size (4~5 nm) can be tightly and homogenously coated on the outside surface of the MWCNTs entirely. The prepared nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and nitrogen BET measurements. It is found that the hydrothermal reaction plays an important role for the crystal growth of the SnO₂ nanocrystals on the surface of MWCNTs, and the crystallinity of the SnO₂ nanocrystals can be controlled by varying the pH value or the hydrothermal reaction time. It is found that a unique structure of leaf-like SnO₂ nanosheets hanging on the MWCNTs was obtained when using water as the solvent of SnCl₂ instead of ethanol. The gas sensing performance of the SnO₂/MWCNTs nanocomposites was also investigated.