Growth and characterization of ZnO (microdisks)/W18O49 (nanorods) heterostructures

ZnO (microdisks)/W18O49 (nanorods) heterostructures were grown on a Si(111) substrate using a thermal evaporation method. X-ray diffraction of the products indicated two separate phases belong to monoclinic W18O49 and hexagonal ZnO structures. Field emission scanning electron microscope (FESEM) images showed W18O49 nanorods with approximately uniform diameters (∼20 nm) on ZnO microdisk. Field emission Auger electron spectroscopy (FEAES) also confirmed two separate elemental characteristics of W18O49 and ZnO. The Raman and photoluminescence (PL) studies demonstrated that the ZnO microdisks have a good crystallinity with excellent optical properties. The Raman results of the ZnO(microdisks)/W18O49(nanorods) heterostructures indicated only W18O49 structure and the PL results of the heterostructures showed two peaks, one in the ultraviolet region at 374 nm and another in the visible region at 500 nm, which both belong to W18O49 nanorods.

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