Pulsed laser ablation in supercritical CO2 to synthesize photocatalytically active TixOy nanoparticles

Reference Presenter Authors
13-024 Amandeep Singh Singh, A.(Tampere University of Technology); Levänen, E.(Tampere University of Technology); Honkanen, M.(Tampere University of Technology); Vihinen, J.(Tampere University of Technology); Salminen, T.(Tampere University of Technology); Nikkanen, J.(Tampere University of Technology); Hyvärinen, L.(Tampere University of Technology); In the past decade, nanotechnology and nanoscience have expanded rapidly in almost all advanced fields in the industry. Due to this, there is a sudden and urgent global demand of nanomaterials. Pulsed laser ablation (PLA) in fluids is a green and energy efficient technique for synthesis of nanoparticles. Through this oral presentation, the potential of PLA in supercritical carbon dioxide (scCO2) to synthesize novel nanomaterials is demonstrated. Pulsed laser ablation in liquids (PLAL) technique has been reported to be a promising method for production of nanoparticles and with latest demonstrations of productivities higher than 4 g/h, PLAL competes well against other colloidal synthesis techniques. The next revolutionary step in this field is ablation in pressurized fluids. Kuwahara et al, reported that the ablation efficiency of copper in pressurized CO2 was several times more at higher pressure compared to lower pressure1. One step further is PLA combined with supercritical fluids, such as, scCO2, which has been reported to support formation of interesting reaction fields for plasma technology and nanotechnology2. In this study, we demonstrate the production of photocatalytically active nanoparticles by PLA of titanium target in scCO2 using a nanosecond pulsed fiber laser. The MB discoloration tests proved the photocatalytic activity of the synthesized nanoparticles. By discussing the key results from TEM, XRD, Raman and methylene blue (MB) discoloration tests for the synthesized nanoparticles from titanium, this study demonstrates the potential of PLA in scCO2 to create novel nanomaterials. 
1. Kuwahara, Y. et al. Nanosecond Pulsed Laser Ablation of Copper in Supercritical Carbon Dioxide. Jpn. J. Appl. Phys. 48, 40207 (2009). 
2. Machmudah, S., Kuwahara, Y., Sasaki, M. & Goto, M. Nano-structured particles production using laser ablation of gold plate in supercritical CO2. J. Supercrit. Fluids 60, 63–68 (2011).
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