In this work we demonstrate the formation of tungsten oxide nanoparticles and aggregate structures through direct femtosecond laser ablation in air. Through selection of different ablation parameters, a degree of control over the formation of aggregate structures is achieved. This allows for the creation of web-like structures spanning large areas of the sample surface or long aggregate chains with lengths over 100 μm, corresponding to more than 1000 nanoparticles linking together. Characterization of nanoparticles is conducted using SEM, TEM and Raman spectroscopy.
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