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Single crystalline tetragonal rutile SnO 2 nanorods with curved beak-like tips of various lengths were synthesized using Au as a catalyst by thermal evaporation with different precursor flow rates. The cathodoluminescence (CL) spectrum shows that the long beak-like SnO 2 nanorods exhibit stronger orange emission at 600 nm, while the short beak-like SnO 2 nanorods exhibit stronger blue emission at 480 nm. The morphology and optical properties can be modified by altering the oxygen content.

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In this paper, a description of a process for synthesizing MoO 3 nanoslabs without using any catalyst is given. The size of the MoO 3 nanostructures varying with time are clearly resolved. Time-dependent relationships vs the thickness and width of the as-grown MoO 3 nanoslabs are demonstrated. Both X-ray diffraction pattern and transmission electron microscopy images indicated that MoO 3 nanoslabs belong to the orthorhombic structure. Three different molybdenum-oxide bondings are differentiated by the Raman spectroscopy. Cathodoluminescene showed a significant red-orange peak based on the band structure of the MoO 3 .