The understanding of shape dependence of nonlinear optical (NLO) behaviors is crucial for designing of an effectivecomponent and device. In this work, nanostructured tungsten oxide (WO_3) in shapes of nanospheres, nanowires, andnanoplates have been prepared using a facile hydrothermal method by controlling the molar ratio of the precursors. Fieldemission scanning electron microscopy (FE-SEM) clearly confirmed the morphology characteristic of the threenanostructures. X-ray diffractometry (XRD) identified the nanospheres were well consistent with octahedralWO_3·0.33H_2O while nanowires and nanoplates can be well indexed to the hexagonal structure of WO_3. Meanwhile, theWO_3 nanostructures displayed shape dependent linear optical behaviors. The NLO properties were measured at 532 nmusing open aperture (OA) Z-scan technique. The two-photon coefficients of WO_3 nanospheres, nanowires and nanoplateswere calculated to be 9.8×10~(-11)m/W, 1.44×10~(-10)m/W, 2.02×10~(-10) m/W, respectively. The nanoplates exhibited the bestNLO performance while the nanospheres present the weakest one. The result implies that the NLO activities can beeffectively tailored by morphology control.
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