The sonochemical preparation of tungsten oxide nanoparticlesElectronic supplementary information (ESI) available: Table S1; elemental analysis values of the product of W(CO)6 sonication in diphenylmethane and of samples heated at 550 °C in Ar and 1000 °C in Ar or air. Fig. S1: TEM image of the product heated at 1000 °C. See http://www.rsc.org/suppdata/jm/b1/b106036h/