Left: the Raman spectrum of the sample prepared at the 10.6-μm wavelength and 85 W/cm2 power density with a SEM micrograph in the inset showing the morphology. Right: the corresponding XRD spectrum with the histogram of the diameters of a selection of the nanostructures with the corresponding SEM micrograph in the inset. The Raman and XRD suggest a monoclinic phase WO3-x(x~0.1).
Govender et al. Nanoscale Research Letters 2011 6:166 doi:10.1186/1556-276X-6-166