ZnO-coated SnO2 (SnO2-core/ZnO-shell) one-dimensional structures were prepared using a two-step method of thermal evaporation of Sn powders followed by atomic layer deposition (ALD) of ZnO. The influence of the ZnO layer's thickness on the photoluminescence (PL) properties of the nanostructure was investigated by using a room-temperature PL spectroscopy analysis. The intensity of the PL peak at about 595 nm, characteristic of the SnO2 core, decreases significantly and shifts to the lower wavelength region to form a broad emission peak ranging from 535 to 595 nm as the ZnO layer's thickness increases. Besides this broad peak a new emission peak, centered around 370 nm in the ultraviolet region also characteristic of ZnO, appears and increases with increasing thickness of the ZnO layer. Our results show that the wavelength of the emitted light can be controlled by coating SnO2 nanobelts with ZnO and optimizing the thickness of the ZnO-shell layer. The experimental results also suggest that the ZnO-coated SnO2 nanostructures can be enhanced by thermal annealing. The growth mechanism of SnO2 one-dimensional nanostructures by thermal evaporation is also discussed.
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